Hi all,
This unit came in the shop today. Unit refuse to start. When pressing
power on, red led in power button flashes constantly, indicating a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

"powerampfreak" wrote in message
oups.com...
Hi all,
This unit came in the shop today. Unit refuse to start. When pressing
power on, red led in power button flashes constantly, indicating a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak


Is this one of the units that has the glass display unit that sits on top?
If so, the most likely cause of the problem is bad caps and bad joints on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit, and is
inside a metal can. Failure of those caps is common on models using the
external display. I have also had fan failure on a couple of units from the
XC-L series, which has resulted in just about all of the electrolytic caps
in the output stages, located under the heatsink, drying out and failing.

Arfa

On 29 Mar, 01:46, "Arfa Daily" wrote:
"powerampfreak" wrote in message

oups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When pressing
power on, red led in power button flashes constantly, indicating a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits on top?
If so, the most likely cause of the problem is bad caps and bad joints on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit, and is
inside a metal can. Failure of those caps is common on models using the
external display. I have also had fan failure on a couple of units from the
XC-L series, which has resulted in just about all of the electrolytic caps
in the output stages, located under the heatsink, drying out and failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve

On 29 Mar, 05:55, "powerampfreak" wrote:
On 29 Mar, 01:46, "Arfa Daily" wrote:





"powerampfreak" wrote in message

roups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When pressing
power on, red led in power button flashes constantly, indicating a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits on top?
If so, the most likely cause of the problem is bad caps and bad joints on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit, and is
inside a metal can. Failure of those caps is common on models using the
external display. I have also had fan failure on a couple of units from the
XC-L series, which has resulted in just about all of the electrolytic caps
in the output stages, located under the heatsink, drying out and failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve- Dölj citerad text -

- Visa citerad text -

Hello Arfa!

I opened the unit to check the VFD module. Then I saw some jumpers
marked "service".
Those were shorted during insertion of mains cord, and the unit
started up correctly. Hmm....
The display looked fine, though I don't know if the power amp operates
properly..
Does the above tell you anything?

Best regards,
Steve

"powerampfreak" wrote in message
oups.com...
On 29 Mar, 05:55, "powerampfreak" wrote:
On 29 Mar, 01:46, "Arfa Daily" wrote:





"powerampfreak" wrote in message

roups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When pressing
power on, red led in power button flashes constantly, indicating a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits on
top?
If so, the most likely cause of the problem is bad caps and bad joints
on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit, and is
inside a metal can. Failure of those caps is common on models using the
external display. I have also had fan failure on a couple of units from
the
XC-L series, which has resulted in just about all of the electrolytic
caps
in the output stages, located under the heatsink, drying out and
failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve- Dölj citerad text -

- Visa citerad text -

Hello Arfa!

I opened the unit to check the VFD module. Then I saw some jumpers
marked "service".
Those were shorted during insertion of mains cord, and the unit
started up correctly. Hmm....
The display looked fine, though I don't know if the power amp operates
properly..
Does the above tell you anything?

Best regards,
Steve

Not really, except if the display is now working correctly, then the VFD
supply module is not the cause of any problems. I'm not sure what you mean
about whether the power amp operates correctly or not. If the unit now fully
powers, with no error indications, and the speakers produce sound, then the
assumption would have to be that the power amp is indeed working correctly
??

Arfa

On 30 Mar, 02:13, "Arfa Daily" wrote:
"powerampfreak" wrote in message

oups.com...
On 29 Mar, 05:55, "powerampfreak" wrote:





On 29 Mar, 01:46, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When pressing
power on, red led in power button flashes constantly, indicating a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits on
top?
If so, the most likely cause of the problem is bad caps and bad joints
on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit, and is
inside a metal can. Failure of those caps is common on models using the
external display. I have also had fan failure on a couple of units from
the
XC-L series, which has resulted in just about all of the electrolytic
caps
in the output stages, located under the heatsink, drying out and
failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve- Dölj citerad text -

- Visa citerad text -

Hello Arfa!

I opened the unit to check the VFD module. Then I saw some jumpers
marked "service".
Those were shorted during insertion of mains cord, and the unit
started up correctly. Hmm....
The display looked fine, though I don't know if the power amp operates
properly..
Does the above tell you anything?

Best regards,
Steve

Not really, except if the display is now working correctly, then the VFD
supply module is not the cause of any problems. I'm not sure what you mean
about whether the power amp operates correctly or not. If the unit now fully
powers, with no error indications, and the speakers produce sound, then the
assumption would have to be that the power amp is indeed working correctly
??

Arfa- Dölj citerad text -

- Visa citerad text -

Arfa, sorry for making you confused.
I didn't check if the unit does output any sound yet...
I just wonder how the set could start as soon as I shorted the service
pins?
Does this clear any internal error codes or something?
I don't feel comfortable returning the unit to customer without
finding any problem, except
for shorting the service pins...
Do you know anything that can set or cause an "error-detect" to the
processor? Like dc from poweramp and such..

Regards,
Steve

"powerampfreak" wrote in message
oups.com...
On 30 Mar, 02:13, "Arfa Daily" wrote:
"powerampfreak" wrote in message

oups.com...
On 29 Mar, 05:55, "powerampfreak" wrote:





On 29 Mar, 01:46, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When
pressing
power on, red led in power button flashes constantly, indicating a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits on
top?
If so, the most likely cause of the problem is bad caps and bad joints
on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit, and
is
inside a metal can. Failure of those caps is common on models using
the
external display. I have also had fan failure on a couple of units
from
the
XC-L series, which has resulted in just about all of the electrolytic
caps
in the output stages, located under the heatsink, drying out and
failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve- Dölj citerad text -

- Visa citerad text -

Hello Arfa!

I opened the unit to check the VFD module. Then I saw some jumpers
marked "service".
Those were shorted during insertion of mains cord, and the unit
started up correctly. Hmm....
The display looked fine, though I don't know if the power amp operates
properly..
Does the above tell you anything?

Best regards,
Steve

Not really, except if the display is now working correctly, then the VFD
supply module is not the cause of any problems. I'm not sure what you mean
about whether the power amp operates correctly or not. If the unit now
fully
powers, with no error indications, and the speakers produce sound, then
the
assumption would have to be that the power amp is indeed working correctly
??

Arfa- Dölj citerad text -

- Visa citerad text -

Arfa, sorry for making you confused.
I didn't check if the unit does output any sound yet...
I just wonder how the set could start as soon as I shorted the service
pins?
Does this clear any internal error codes or something?
I don't feel comfortable returning the unit to customer without
finding any problem, except
for shorting the service pins...
Do you know anything that can set or cause an "error-detect" to the
processor? Like dc from poweramp and such..

Regards,
Steve

I can't recall ever having come across such on this particular model series,
but I do recall having a Pioneer AV amp in for repair some time ago, which
had done exactly that, and locked an error code into its processor, which
permanently prevented it from powering, leaving just a flashing LED on the
front panel. I had to put in a call to Pioneer Technical in the end ( who
used to be absolutely excellent here in the UK - same two guys down there
for years - but their department is sadly gone now ). They told me a
button-push sequence that was required, and said that there was likely no
other problem, which as I recall, there wasn't. Have you got the unit's own
speakers in the shop with it, or are you using the shop test ones ? If you
don't have the customer's own speakers, and it seems to work ok over an
extended bench soak, I would give it back and tell them that it had an error
code locked into it, and that this might have been due to a surge or
micro-outage in their household supply, or might be due to a faulty speaker,
or bad wiring to the speakers. Might be worth giving them a call before you
declare it fixed, just to ask what, if any, the circumstances of failure
were. I find that when I do this, I often get an answer like " Oh yes, it
wouldn't come back on after someone put a digger through a cable out in the
road - didn't I mention that .... ? "

Arfa

On 30 Mar, 11:38, "Arfa Daily" wrote:
"powerampfreak" wrote in message

oups.com...
On 30 Mar, 02:13, "Arfa Daily" wrote:





"powerampfreak" wrote in message

roups.com...
On 29 Mar, 05:55, "powerampfreak" wrote:

On 29 Mar, 01:46, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When
pressing
power on, red led in power button flashes constantly, indicating a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits on
top?
If so, the most likely cause of the problem is bad caps and bad joints
on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit, and
is
inside a metal can. Failure of those caps is common on models using
the
external display. I have also had fan failure on a couple of units
from
the
XC-L series, which has resulted in just about all of the electrolytic
caps
in the output stages, located under the heatsink, drying out and
failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve- Dölj citerad text -

- Visa citerad text -

Hello Arfa!

I opened the unit to check the VFD module. Then I saw some jumpers
marked "service".
Those were shorted during insertion of mains cord, and the unit
started up correctly. Hmm....
The display looked fine, though I don't know if the power amp operates
properly..
Does the above tell you anything?

Best regards,
Steve

Not really, except if the display is now working correctly, then the VFD
supply module is not the cause of any problems. I'm not sure what you mean
about whether the power amp operates correctly or not. If the unit now
fully
powers, with no error indications, and the speakers produce sound, then
the
assumption would have to be that the power amp is indeed working correctly
??

Arfa- Dölj citerad text -

- Visa citerad text -

Arfa, sorry for making you confused.
I didn't check if the unit does output any sound yet...
I just wonder how the set could start as soon as I shorted the service
pins?
Does this clear any internal error codes or something?
I don't feel comfortable returning the unit to customer without
finding any problem, except
for shorting the service pins...
Do you know anything that can set or cause an "error-detect" to the
processor? Like dc from poweramp and such..

Regards,
Steve

I can't recall ever having come across such on this particular model series,
but I do recall having a Pioneer AV amp in for repair some time ago, which
had done exactly that, and locked an error code into its processor, which
permanently prevented it from powering, leaving just a flashing LED on the
front panel. I had to put in a call to Pioneer Technical in the end ( who
used to be absolutely excellent here in the UK - same two guys down there
for years - but their department is sadly gone now ). They told me a
button-push sequence that was required, and said that there was likely no
other problem, which as I recall, there wasn't. Have you got the unit's own
speakers in the shop with it, or are you using the shop test ones ? If you
don't have the customer's own speakers, and it seems to work ok over an
extended bench soak, I would give it back and tell them that it had an error
code locked into it, and that this might have been due to a surge or
micro-outage in their household supply, or might be due to a faulty speaker,
or bad wiring to the speakers. Might be worth giving them a call before you
declare it fixed, just to ask what, if any, the circumstances of failure
were. I find that when I do this, I often get an answer like " Oh yes, it
wouldn't come back on after someone put a digger through a cable out in the
road - didn't I mention that .... ? "

Arfa- Dölj citerad text -

- Visa citerad text -

The thing is, the customer claims the unit was harder and harder each
day to power on.
In the end, they had to press several times on the powerbutton.
This indicates some "capacitor" problem in my eyes... doesn't it?
Maybe I would go for the checking the powersupply caps and poweramp
caps,
after checking the fuse is ok.

"powerampfreak" wrote in message
ups.com...
On 30 Mar, 11:38, "Arfa Daily" wrote:
"powerampfreak" wrote in message

oups.com...
On 30 Mar, 02:13, "Arfa Daily" wrote:





"powerampfreak" wrote in message

roups.com...
On 29 Mar, 05:55, "powerampfreak" wrote:

On 29 Mar, 01:46, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When
pressing
power on, red led in power button flashes constantly, indicating a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits
on
top?
If so, the most likely cause of the problem is bad caps and bad
joints
on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit, and
is
inside a metal can. Failure of those caps is common on models using
the
external display. I have also had fan failure on a couple of units
from
the
XC-L series, which has resulted in just about all of the
electrolytic
caps
in the output stages, located under the heatsink, drying out and
failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve- Dölj citerad text -

- Visa citerad text -

Hello Arfa!

I opened the unit to check the VFD module. Then I saw some jumpers
marked "service".
Those were shorted during insertion of mains cord, and the unit
started up correctly. Hmm....
The display looked fine, though I don't know if the power amp operates
properly..
Does the above tell you anything?

Best regards,
Steve

Not really, except if the display is now working correctly, then the VFD
supply module is not the cause of any problems. I'm not sure what you
mean
about whether the power amp operates correctly or not. If the unit now
fully
powers, with no error indications, and the speakers produce sound, then
the
assumption would have to be that the power amp is indeed working
correctly
??

Arfa- Dölj citerad text -

- Visa citerad text -

Arfa, sorry for making you confused.
I didn't check if the unit does output any sound yet...
I just wonder how the set could start as soon as I shorted the service
pins?
Does this clear any internal error codes or something?
I don't feel comfortable returning the unit to customer without
finding any problem, except
for shorting the service pins...
Do you know anything that can set or cause an "error-detect" to the
processor? Like dc from poweramp and such..

Regards,
Steve

I can't recall ever having come across such on this particular model
series,
but I do recall having a Pioneer AV amp in for repair some time ago, which
had done exactly that, and locked an error code into its processor, which
permanently prevented it from powering, leaving just a flashing LED on the
front panel. I had to put in a call to Pioneer Technical in the end ( who
used to be absolutely excellent here in the UK - same two guys down there
for years - but their department is sadly gone now ). They told me a
button-push sequence that was required, and said that there was likely no
other problem, which as I recall, there wasn't. Have you got the unit's
own
speakers in the shop with it, or are you using the shop test ones ? If you
don't have the customer's own speakers, and it seems to work ok over an
extended bench soak, I would give it back and tell them that it had an
error
code locked into it, and that this might have been due to a surge or
micro-outage in their household supply, or might be due to a faulty
speaker,
or bad wiring to the speakers. Might be worth giving them a call before
you
declare it fixed, just to ask what, if any, the circumstances of failure
were. I find that when I do this, I often get an answer like " Oh yes, it
wouldn't come back on after someone put a digger through a cable out in
the
road - didn't I mention that .... ? "

Arfa- Dölj citerad text -

- Visa citerad text -

The thing is, the customer claims the unit was harder and harder each
day to power on.
In the end, they had to press several times on the powerbutton.
This indicates some "capacitor" problem in my eyes... doesn't it?
Maybe I would go for the checking the powersupply caps and poweramp
caps,
after checking the fuse is ok.

I agree with your feelings about the cap. Going back to the VFD inverter, as
it is a known source of trouble, which does stop the unit powering out of
standby, particularly because of bad joints on the transistors, I might feel
inclined to look there first, especially if the board is discoloured around
the transistors. The caps which fail are just above the transistors, so are
in streaming heat all the time. Could be that one of them is getting
marginal, or could be that the joints are getting poor on the transistors,
and when you had a look in there before, you disturbed them, which is why it
then came on. Make sure that the fan is running ok if there is any sign of
heat distress around the output stages. The couple I had where the fan had
stopped, had a discoloured board, and the electrolytic caps just 'looked'
stressed somehow - you know how you get a "feel" for these things when you
work with them every day.

Arfa

On 30 Mar, 23:03, "Arfa Daily" wrote:
"powerampfreak" wrote in message

ups.com...
On 30 Mar, 11:38, "Arfa Daily" wrote:





"powerampfreak" wrote in message

roups.com...
On 30 Mar, 02:13, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...
On 29 Mar, 05:55, "powerampfreak" wrote:

On 29 Mar, 01:46, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When
pressing
power on, red led in power button flashes constantly, indicating a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits
on
top?
If so, the most likely cause of the problem is bad caps and bad
joints
on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit, and
is
inside a metal can. Failure of those caps is common on models using
the
external display. I have also had fan failure on a couple of units
from
the
XC-L series, which has resulted in just about all of the
electrolytic
caps
in the output stages, located under the heatsink, drying out and
failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve- Dölj citerad text -

- Visa citerad text -

Hello Arfa!

I opened the unit to check the VFD module. Then I saw some jumpers
marked "service".
Those were shorted during insertion of mains cord, and the unit
started up correctly. Hmm....
The display looked fine, though I don't know if the power amp operates
properly..
Does the above tell you anything?

Best regards,
Steve

Not really, except if the display is now working correctly, then the VFD
supply module is not the cause of any problems. I'm not sure what you
mean
about whether the power amp operates correctly or not. If the unit now
fully
powers, with no error indications, and the speakers produce sound, then
the
assumption would have to be that the power amp is indeed working
correctly
??

Arfa- Dölj citerad text -

- Visa citerad text -

Arfa, sorry for making you confused.
I didn't check if the unit does output any sound yet...
I just wonder how the set could start as soon as I shorted the service
pins?
Does this clear any internal error codes or something?
I don't feel comfortable returning the unit to customer without
finding any problem, except
for shorting the service pins...
Do you know anything that can set or cause an "error-detect" to the
processor? Like dc from poweramp and such..

Regards,
Steve

I can't recall ever having come across such on this particular model
series,
but I do recall having a Pioneer AV amp in for repair some time ago, which
had done exactly that, and locked an error code into its processor, which
permanently prevented it from powering, leaving just a flashing LED on the
front panel. I had to put in a call to Pioneer Technical in the end ( who
used to be absolutely excellent here in the UK - same two guys down there
for years - but their department is sadly gone now ). They told me a
button-push sequence that was required, and said that there was likely no
other problem, which as I recall, there wasn't. Have you got the unit's
own
speakers in the shop with it, or are you using the shop test ones ? If you
don't have the customer's own speakers, and it seems to work ok over an
extended bench soak, I would give it back and tell them that it had an
error
code locked into it, and that this might have been due to a surge or
micro-outage in their household supply, or might be due to a faulty
speaker,
or bad wiring to the speakers. Might be worth giving them a call before
you
declare it fixed, just to ask what, if any, the circumstances of failure
were. I find that when I do this, I often get an answer like " Oh yes, it
wouldn't come back on after someone put a digger through a cable out in
the
road - didn't I mention that .... ? "

Arfa- Dölj citerad text -

- Visa citerad text -

The thing is, the customer claims the unit was harder and harder each
day to power on.
In the end, they had to press several times on the powerbutton.
This indicates some "capacitor" problem in my eyes... doesn't it?
Maybe I would go for the checking the powersupply caps and poweramp
caps,
after checking the fuse is ok.

I agree with your feelings about the cap. Going back to the VFD inverter, as
it is a known source of trouble, which does stop the unit powering out of
standby, particularly because of bad joints on the transistors, I might feel
inclined to look there first, especially if the board is discoloured around
the transistors. The caps which fail are just above the transistors, so are
in streaming heat all the time. Could be that one of them is getting
marginal, or could be that the joints are getting poor on the transistors,
and when you had a look in there before, you disturbed them, which is why it
then came on. Make sure that the fan is running ok if there is any sign of
heat distress around the output stages. The couple I had where the fan had
stopped, had a discoloured board, and the electrolytic caps just 'looked'
stressed somehow - you know how you get a "feel" for these things when you
work with them every day.

Arfa- Dölj citerad text -

- Visa citerad text -

"after checking the fuse is ok"
....Of course I mean after checking the fan is ok. Not the fuse, just a
type error.
I'll go for the VFD inverter, checking the stuff under the metal
cover.
Thanks a lot for your assistance, nice to have contact with other pro
repair men!!

Regards
Steve

"powerampfreak" wrote in message
oups.com...
On 30 Mar, 23:03, "Arfa Daily" wrote:
"powerampfreak" wrote in message

ups.com...
On 30 Mar, 11:38, "Arfa Daily" wrote:





"powerampfreak" wrote in message

roups.com...
On 30 Mar, 02:13, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...
On 29 Mar, 05:55, "powerampfreak" wrote:

On 29 Mar, 01:46, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When
pressing
power on, red led in power button flashes constantly, indicating
a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits
on
top?
If so, the most likely cause of the problem is bad caps and bad
joints
on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit,
and
is
inside a metal can. Failure of those caps is common on models
using
the
external display. I have also had fan failure on a couple of units
from
the
XC-L series, which has resulted in just about all of the
electrolytic
caps
in the output stages, located under the heatsink, drying out and
failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve- Dölj citerad text -

- Visa citerad text -

Hello Arfa!

I opened the unit to check the VFD module. Then I saw some jumpers
marked "service".
Those were shorted during insertion of mains cord, and the unit
started up correctly. Hmm....
The display looked fine, though I don't know if the power amp operates
properly..
Does the above tell you anything?

Best regards,
Steve

Not really, except if the display is now working correctly, then the
VFD
supply module is not the cause of any problems. I'm not sure what you
mean
about whether the power amp operates correctly or not. If the unit now
fully
powers, with no error indications, and the speakers produce sound,
then
the
assumption would have to be that the power amp is indeed working
correctly
??

Arfa- Dölj citerad text -

- Visa citerad text -

Arfa, sorry for making you confused.
I didn't check if the unit does output any sound yet...
I just wonder how the set could start as soon as I shorted the service
pins?
Does this clear any internal error codes or something?
I don't feel comfortable returning the unit to customer without
finding any problem, except
for shorting the service pins...
Do you know anything that can set or cause an "error-detect" to the
processor? Like dc from poweramp and such..

Regards,
Steve

I can't recall ever having come across such on this particular model
series,
but I do recall having a Pioneer AV amp in for repair some time ago,
which
had done exactly that, and locked an error code into its processor,
which
permanently prevented it from powering, leaving just a flashing LED on
the
front panel. I had to put in a call to Pioneer Technical in the end (
who
used to be absolutely excellent here in the UK - same two guys down
there
for years - but their department is sadly gone now ). They told me a
button-push sequence that was required, and said that there was likely
no
other problem, which as I recall, there wasn't. Have you got the unit's
own
speakers in the shop with it, or are you using the shop test ones ? If
you
don't have the customer's own speakers, and it seems to work ok over an
extended bench soak, I would give it back and tell them that it had an
error
code locked into it, and that this might have been due to a surge or
micro-outage in their household supply, or might be due to a faulty
speaker,
or bad wiring to the speakers. Might be worth giving them a call before
you
declare it fixed, just to ask what, if any, the circumstances of failure
were. I find that when I do this, I often get an answer like " Oh yes,
it
wouldn't come back on after someone put a digger through a cable out in
the
road - didn't I mention that .... ? "

Arfa- Dölj citerad text -

- Visa citerad text -

The thing is, the customer claims the unit was harder and harder each
day to power on.
In the end, they had to press several times on the powerbutton.
This indicates some "capacitor" problem in my eyes... doesn't it?
Maybe I would go for the checking the powersupply caps and poweramp
caps,
after checking the fuse is ok.

I agree with your feelings about the cap. Going back to the VFD inverter,
as
it is a known source of trouble, which does stop the unit powering out of
standby, particularly because of bad joints on the transistors, I might
feel
inclined to look there first, especially if the board is discoloured
around
the transistors. The caps which fail are just above the transistors, so
are
in streaming heat all the time. Could be that one of them is getting
marginal, or could be that the joints are getting poor on the transistors,
and when you had a look in there before, you disturbed them, which is why
it
then came on. Make sure that the fan is running ok if there is any sign of
heat distress around the output stages. The couple I had where the fan had
stopped, had a discoloured board, and the electrolytic caps just 'looked'
stressed somehow - you know how you get a "feel" for these things when you
work with them every day.

Arfa- Dölj citerad text -

- Visa citerad text -

"after checking the fuse is ok"
....Of course I mean after checking the fan is ok. Not the fuse, just a
type error.
I'll go for the VFD inverter, checking the stuff under the metal
cover.
Thanks a lot for your assistance, nice to have contact with other pro
repair men!!

Regards
Steve


No problem, and please keep me posted on what you find. I do quite a few
Pioneers, so all info, and other people's findings are always welcome for
the archive.

Arfa

On 31 Mar, 02:17, "Arfa Daily" wrote:
"powerampfreak" wrote in message

oups.com...
On 30 Mar, 23:03, "Arfa Daily" wrote:





"powerampfreak" wrote in message

oups.com...
On 30 Mar, 11:38, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...
On 30 Mar, 02:13, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...
On 29 Mar, 05:55, "powerampfreak" wrote:

On 29 Mar, 01:46, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When
pressing
power on, red led in power button flashes constantly, indicating
a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits
on
top?
If so, the most likely cause of the problem is bad caps and bad
joints
on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit,
and
is
inside a metal can. Failure of those caps is common on models
using
the
external display. I have also had fan failure on a couple of units
from
the
XC-L series, which has resulted in just about all of the
electrolytic
caps
in the output stages, located under the heatsink, drying out and
failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve- Dölj citerad text -

- Visa citerad text -

Hello Arfa!

I opened the unit to check the VFD module. Then I saw some jumpers
marked "service".
Those were shorted during insertion of mains cord, and the unit
started up correctly. Hmm....
The display looked fine, though I don't know if the power amp operates
properly..
Does the above tell you anything?

Best regards,
Steve

Not really, except if the display is now working correctly, then the
VFD
supply module is not the cause of any problems. I'm not sure what you
mean
about whether the power amp operates correctly or not. If the unit now
fully
powers, with no error indications, and the speakers produce sound,
then
the
assumption would have to be that the power amp is indeed working
correctly
??

Arfa- Dölj citerad text -

- Visa citerad text -

Arfa, sorry for making you confused.
I didn't check if the unit does output any sound yet...
I just wonder how the set could start as soon as I shorted the service
pins?
Does this clear any internal error codes or something?
I don't feel comfortable returning the unit to customer without
finding any problem, except
for shorting the service pins...
Do you know anything that can set or cause an "error-detect" to the
processor? Like dc from poweramp and such..

Regards,
Steve

I can't recall ever having come across such on this particular model
series,
but I do recall having a Pioneer AV amp in for repair some time ago,
which
had done exactly that, and locked an error code into its processor,
which
permanently prevented it from powering, leaving just a flashing LED on
the
front panel. I had to put in a call to Pioneer Technical in the end (
who
used to be absolutely excellent here in the UK - same two guys down
there
for years - but their department is sadly gone now ). They told me a
button-push sequence that was required, and said that there was likely
no
other problem, which as I recall, there wasn't. Have you got the unit's
own
speakers in the shop with it, or are you using the shop test ones ? If
you
don't have the customer's own speakers, and it seems to work ok over an
extended bench soak, I would give it back and tell them that it had an
error
code locked into it, and that this might have been due to a surge or
micro-outage in their household supply, or might be due to a faulty
speaker,
or bad wiring to the speakers. Might be worth giving them a call before
you
declare it fixed, just to ask what, if any, the circumstances of failure
were. I find that when I do this, I often get an answer like " Oh yes,
it
wouldn't come back on after someone put a digger through a cable out in
the
road - didn't I mention that .... ? "

Arfa- Dölj citerad text -

- Visa citerad text -

The thing is, the customer claims the unit was harder and harder each
day to power on.
In the end, they had to press several times on the powerbutton.
This indicates some "capacitor" problem in my eyes... doesn't it?
Maybe I would go for the checking the powersupply caps and poweramp
caps,
after checking the fuse is ok.

I agree with your feelings about the cap. Going back to the VFD inverter,
as
it is a known source of trouble, which does stop the unit powering out of
standby, particularly because of bad joints on the transistors, I might
feel
inclined to look there first, especially if the board is discoloured
around
the transistors. The caps which fail are just above the transistors, so
are
in streaming heat all the time. Could be that one of them is getting
marginal, or could be that the joints are getting poor on the transistors,
and when you had a look in there before, you disturbed them, which is why
it
then came on. Make sure that the fan is running ok if there is any sign of
heat distress around the output stages. The couple I had where the fan had
stopped, had a discoloured board, and the electrolytic caps just 'looked'
stressed somehow - you know how you get a "feel" for these things when you
work with them every day.

Arfa- Dölj citerad text -

- Visa citerad text -

"after checking the fuse is ok"
...Of course I mean after checking the fan is ok. Not the fuse, just a
type error.
I'll go for the VFD inverter, checking the stuff under the metal
cover.
Thanks a lot for your assistance, nice to have contact with other pro
repair men!!

Regards
Steve

No problem, and please keep me posted on what you find. I do quite a few
Pioneers, so all info, and other people's findings are always welcome for
the archive.

Arfa- Dölj citerad text -

- Visa citerad text -

Hi Arfa,

This Pioneer is making me nuts.
The hardware seems all ok as soon as the Service pins are shorted
once.
After this everything works OK.
After a few unplugs from the mains, the red led will flash when trying
to start up unit.
Maybe it's a problem with the micro controller itself, since the rest
of the hardware seems to work just fine.
Just informed customer this unit's repairprice will increase due to
this strange behaviour....

You don't have a contact at some Pioneer tech dept. for additional
support?

Regards
Steve

On 3 Apr., 21:47, "powerampfreak" wrote:
On 31 Mar, 02:17, "Arfa Daily" wrote:





"powerampfreak" wrote in message

roups.com...
On 30 Mar, 23:03, "Arfa Daily" wrote:

"powerampfreak" wrote in message

oups.com...
On 30 Mar, 11:38, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...
On 30 Mar, 02:13, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...
On 29 Mar, 05:55, "powerampfreak" wrote:

On 29 Mar, 01:46, "Arfa Daily" wrote:

"powerampfreak" wrote in message

roups.com...

Hi all,
This unit came in the shop today. Unit refuse to start. When
pressing
power on, red led in power button flashes constantly, indicating
a
problem. Never had this unit before. Any advice is appreciated.
A blown poweramp? Powersupply failure?

Best regards
The poweramp freak

Is this one of the units that has the glass display unit that sits
on
top?
If so, the most likely cause of the problem is bad caps and bad
joints
on
the transistors in the VFD multiplier module. This unit is located
immediately behind the socket that goes out to the display unit,
and
is
inside a metal can. Failure of those caps is common on models
using
the
external display. I have also had fan failure on a couple of units
from
the
XC-L series, which has resulted in just about all of the
electrolytic
caps
in the output stages, located under the heatsink, drying out and
failing.

Arfa

Thanks for your advice. This will be checked promptly.

Reagrds
Steve- Dölj citerad text -

- Visa citerad text -

Hello Arfa!

I opened the unit to check the VFD module. Then I saw some jumpers
marked "service".
Those were shorted during insertion of mains cord, and the unit
started up correctly. Hmm....
The display looked fine, though I don't know if the power amp operates
properly..
Does the above tell you anything?

Best regards,
Steve

Not really, except if the display is now working correctly, then the
VFD
supply module is not the cause of any problems. I'm not sure what you
mean
about whether the power amp operates correctly or not. If the unit now
fully
powers, with no error indications, and the speakers produce sound,
then
the
assumption would have to be that the power amp is indeed working
correctly
??

Arfa- Dölj citerad text -

- Visa citerad text -

Arfa, sorry for making you confused.
I didn't check if the unit does output any sound yet...
I just wonder how the set could start as soon as I shorted the service
pins?
Does this clear any internal error codes or something?
I don't feel comfortable returning the unit to customer without
finding any problem, except
for shorting the service pins...
Do you know anything that can set or cause an "error-detect" to the
processor? Like dc from poweramp and such..

Regards,
Steve

I can't recall ever having come across such on this particular model
series,
but I do recall having a Pioneer AV amp in for repair some time ago,
which
had done exactly that, and locked an error code into its processor,
which
permanently prevented it from powering, leaving just a flashing LED on
the
front panel. I had to put in a call to Pioneer Technical in the end (
who
used to be absolutely excellent here in the UK - same two guys down
there
for years - but their department is sadly gone now ). They told me a
button-push sequence that was required, and said that there was likely
no
other problem, which as I recall, there wasn't. Have you got the unit's
own
speakers in the shop with it, or are you using the shop test ones ? If
you
don't have the customer's own speakers, and it seems to work ok over an
extended bench soak, I would give it back and tell them that it had an
error
code locked into it, and that this might have been due to a surge or
micro-outage in their household supply, or might be due to a faulty
speaker,
or bad wiring to the speakers. Might be worth giving them a call before
you
declare it fixed, just to ask what, if any, the circumstances of failure
were. I find that when I do this, I often get an answer like " Oh yes,
it
wouldn't come back on after someone put a digger through a cable out in
the
road - didn't I mention that .... ? "

Arfa- Dölj citerad text -

- Visa citerad text -

The thing is, the customer claims the unit was harder and harder each
day to power on.
In the end, they had to press several times on the powerbutton.
This indicates some "capacitor" problem in my eyes... doesn't it?
Maybe I would go for the checking the powersupply caps and poweramp
caps,
after checking the fuse is ok.

I agree with your feelings about the cap. Going back to the VFD inverter,
as
it is a known source of trouble, which does stop the unit powering out of
standby, particularly because of bad joints on the transistors, I might
feel
inclined to look there first, especially if the board is discoloured
around
the transistors. The caps which fail are just above the transistors, so
are
in streaming heat all the time. Could be that one of them is getting
marginal, or could be that the joints are getting poor on the transistors,
and when you had a look in there before, you disturbed them, which is why
it
then came on. Make sure that the fan is running ok if there is any sign of
heat distress around the output stages. The couple I had where the fan had
stopped, had a discoloured board, and the electrolytic caps just 'looked'
stressed somehow - you know how you get a "feel" for these things when you
work with them every day.

Arfa- Dölj citerad text -

- Visa citerad text -

"after checking the fuse is ok"
...Of course I mean after checking the fan is ok. Not the fuse, just a
type error.
I'll go for the VFD inverter, checking the stuff under the metal
cover.
Thanks a lot for your assistance, nice to have contact with other pro
repair men!!

Regards
Steve

No problem, and please keep me posted on what you find. I do quite a few
Pioneers, so all info, and other people's findings are always welcome for
the archive.

Arfa- Dölj citerad text -

- Visa citerad text -

Hi Arfa,

This Pioneer is making me nuts.
The hardware seems all ok as soon as the Service pins are shorted
once.
After this everything works OK.
After a few unplugs from the mains, the red led will flash when trying
to start up unit.
Maybe it's a problem with the micro controller itself, since the rest
of the hardware seems to work just fine.
Just informed customer this unit's repairprice will increase due to
this strange behaviour....

You don't have a contact at some Pioneer tech dept. for additional
support?

Regards
Steve- Skjul tekst i anførselstegn -

- Vis tekst i anførselstegn -

Just for info
I have the same Pionner model, and the same problem. If I power the
system off and on for some times then the unit eventually works.
But if I disconnect the display unit, the system always power on, but
i wont be able to use it without the display connectet so it really
don't helps.

If somone find out the problem, please help me.

brest regards
Erik