Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old August 9th 03, 06:30 AM
DFerree923
 
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Default Anyone have a source for Pioneer parts? (was: Pioneer VS. Lightning)

Me again. I have narrowed it down to the tuner board being the problem. With
the tuner card removed, all other functions work, and volume can be turned up
as much as I want. Sound like the tuner board was causing the DC at output?

Now the problem is replacing it. Pioneer wants $88+shipping for the board
(AWE1140). All I have is a RadioShack DMM; no scope or service manual. Thus,
I figure my only option is to replace it. Anybody out there have a source
that's cheaper?

Thanks again,
Del

I have an older Pioneer VSX-502 receiver that got hit by lightning through
the
AC line. Everything seems to work, except for the radio tuner. All fuses are
ok. I have already replaced the LM7001 chip, and the TC9164N (Pioneer suggests
these to be the problem after a strike through the antenna). Still, no radio.

I can get a "thumping" sound (oscillation) through the speakers when in AM
mode, but nothing in FM. Also, there are two indicators in the dislplay for
"tuned" and "stereo". Neither one is lit, except for when the board that
contains the LM7001 chip is removed(?), then they both work, but obvivously no
radio without the antenna card.

One other problem is that when the volume is increased past 1/3 of the way,
there is a relay click (overload protect?), and the speakers cut out. Any
suggestions welcome.

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Old August 9th 03, 07:36 AM
David
 
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Default Anyone have a source for Pioneer parts? (was: Pioneer VS. Lightning)

Pioneer is the only source for that board.
One of two choices, buy the board, junk the unit, keep the unit and hope for
a unit up on Ebay with blown audio outputs, or junk the unit.

Of course you could always take the unit into a well equipped, experienced,
and trained technician on that type of unit for an estimate to repair to the
component level.

David

DFerree923 wrote in message
...
Me again. I have narrowed it down to the tuner board being the problem.

With
the tuner card removed, all other functions work, and volume can be turned

up
as much as I want. Sound like the tuner board was causing the DC at

output?

Now the problem is replacing it. Pioneer wants $88+shipping for the board
(AWE1140). All I have is a RadioShack DMM; no scope or service manual.

Thus,
I figure my only option is to replace it. Anybody out there have a source
that's cheaper?

Thanks again,
Del

I have an older Pioneer VSX-502 receiver that got hit by lightning

through
the
AC line. Everything seems to work, except for the radio tuner. All fuses

are
ok. I have already replaced the LM7001 chip, and the TC9164N (Pioneer

suggests
these to be the problem after a strike through the antenna). Still, no

radio.

I can get a "thumping" sound (oscillation) through the speakers when in AM
mode, but nothing in FM. Also, there are two indicators in the dislplay

for
"tuned" and "stereo". Neither one is lit, except for when the board that
contains the LM7001 chip is removed(?), then they both work, but

obvivously no
radio without the antenna card.

One other problem is that when the volume is increased past 1/3 of the

way,
there is a relay click (overload protect?), and the speakers cut out. Any
suggestions welcome.



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Old August 9th 03, 05:10 PM
BOB URZ
 
Posts: n/a
Default Anyone have a source for Pioneer parts? (was: Pioneer VS. Lightning)



DFerree923 wrote:

Me again. I have narrowed it down to the tuner board being the problem. With
the tuner card removed, all other functions work, and volume can be turned up
as much as I want. Sound like the tuner board was causing the DC at output?

Now the problem is replacing it. Pioneer wants $88+shipping for the board
(AWE1140). All I have is a RadioShack DMM; no scope or service manual. Thus,
I figure my only option is to replace it. Anybody out there have a source
that's cheaper?

Thanks again,
Del

I have an older Pioneer VSX-502 receiver that got hit by lightning through
the
AC line. Everything seems to work, except for the radio tuner. All fuses are
ok. I have already replaced the LM7001 chip, and the TC9164N (Pioneer suggests
these to be the problem after a strike through the antenna). Still, no radio.

I can get a "thumping" sound (oscillation) through the speakers when in AM
mode, but nothing in FM. Also, there are two indicators in the dislplay for
"tuned" and "stereo". Neither one is lit, except for when the board that
contains the LM7001 chip is removed(?), then they both work, but obvivously no
radio without the antenna card.

One other problem is that when the volume is increased past 1/3 of the way,
there is a relay click (overload protect?), and the speakers cut out. Any
suggestions welcome.


Without a schematic and the proper trouble shooting knowledge, your in trouble. But
i would guess your sucking down one of the power rails.
I would be looking for a shorted cap or diode lowering one of the B+
rails. WIth a bit of load shedding and solder wick, unhook things on the
power rail in that module until the rail comes back up to the proper voltage
then try to isolate the problem.

BOB




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