This unit will not power on.

The 5v standby voltage is there. The power button has no effect.

5 volts is on one side of the power button. That seems ok.

It would seem that System control is not turning on the relay for the main
transformer.

There is about 18v on the relay, but of course the Digital Transistor(relay
switch) is not being turned on to activate the relay.

I did notice when I pressed the power button the 18v on the relay went to
about 15v and then after couple seconds back 18v.


I am using the SM for the VSX-D511, but the VSX-D514 SM would be good to
have. Any suggestions besides Pioneer Parts?

Any info/direction on this unit would be great!

Thanks
Jimmy

wrote:
This unit will not power on.

The 5v standby voltage is there. The power button has no effect.

5 volts is on one side of the power button. That seems ok.

It would seem that System control is not turning on the relay for the
main transformer.

There is about 18v on the relay, but of course the Digital
Transistor(relay switch) is not being turned on to activate the relay.

I did notice when I pressed the power button the 18v on the relay
went to about 15v and then after couple seconds back 18v.


I am using the SM for the VSX-D511, but the VSX-D514 SM would be good
to have. Any suggestions besides Pioneer Parts?

Any info/direction on this unit would be great!

Thanks
Jimmy

Find the transistor which drives the relay, and see if it's base is being
driven. Sounds like it may be bad. This might explain why the voltage to the
coil drops a bit when it should power-on.

Mark Z.

I would like to try a new relay driver transistor, but I can only find it at
Pioneer parts. It's only a @1.22, but they want almost $6 for S&H.

That is crazy. Anyway...

According to the Schematic, it contains two bias resistors.

I know I could check the transistor with my meter but that doesn't help in
the circuit (breakdown under load).
Plus I have the funcky bias resistors inside the transistor.

Do you know of a way to do a quick test on this without having a replacement
transistor?

Do know of a cross for this transistor: KRC101M ? A suitable cross would be
great.


It would seem Pioneer is as bad as Sony (or worse) at using hard to find
parts.

Here's the datasheet:
http://www.alldatasheet.com/datashee...C/KRC101M.html

Thanks
Jimmy

writes:

I would like to try a new relay driver transistor, but I can only find it at
Pioneer parts. It's only a @1.22, but they want almost $6 for S&H.

That is crazy. Anyway...

According to the Schematic, it contains two bias resistors.

I know I could check the transistor with my meter but that doesn't help in
the circuit (breakdown under load).
Plus I have the funcky bias resistors inside the transistor.

Do you know of a way to do a quick test on this without having a replacement
transistor?

Do know of a cross for this transistor: KRC101M ? A suitable cross would be
great.


It would seem Pioneer is as bad as Sony (or worse) at using hard to find
parts.

Here's the datasheet:
http://www.alldatasheet.com/datashee...C/KRC101M.html

Yeah, those so-called "digital" transistors are IMO a joke.

If you have any general purpose NPN transistor like a 2N3904, you can
just add the two resistors and be done.

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Good idea

Thanks for the reply!
Jimmy

wrote:
I would like to try a new relay driver transistor, but I can only
find it at Pioneer parts. It's only a @1.22, but they want almost $6
for S&H.

That is crazy. Anyway...

According to the Schematic, it contains two bias resistors.

I know I could check the transistor with my meter but that doesn't
help in the circuit (breakdown under load).
Plus I have the funcky bias resistors inside the transistor.

Do you know of a way to do a quick test on this without having a
replacement transistor?

Do know of a cross for this transistor: KRC101M ? A suitable cross
would be great.


It would seem Pioneer is as bad as Sony (or worse) at using hard to
find parts.

Here's the datasheet:
http://www.alldatasheet.com/datashee...C/KRC101M.html

Thanks
Jimmy

Well, the thing to do is measure the voltages. It either works or it
doesn't. Digital transistors are easy. Normally the emitter side is at
ground. If there's 5 volts or whatever to the base, the collector should go
low. If it doesn't, the transistor is bad. Probably best to suck it up and
order the Pioneer part. By the time you source a replacement, you've already
burned up that 6.00 and more.

Mark Z.

I checked the relay transistor again and is seems kinda odd.

The collector shows about 18v. The base shows about -.3 or -1.2 if I press
the power button. The voltage fluctuates.

The emitter has about the same readings as the base. *he scratches his head*

Does this sound like a ground problem or a system control problem?

I just want to be sure I haven't missed anything b4 I order a new relay
trans.

Thanks
Jimmy

wrote:
I checked the relay transistor again and is seems kinda odd.

The collector shows about 18v. The base shows about -.3 or -1.2 if I
press the power button. The voltage fluctuates.

The emitter has about the same readings as the base. *he scratches
his head*

Does this sound like a ground problem or a system control problem?

I just want to be sure I haven't missed anything b4 I order a new
relay trans.

Thanks
Jimmy

Sounds like you're definitely at least having a problem getting a good
ground reference for your measurements. I have seen a bad eyelet at the
power transformer cause similar issues on a Pioneer. The emitter of the
relay drive transistor should have direct continuity to the center leg of
the positive 5 volt regulator. The receiver chassis should be at ground
potential, as well.
The PDF is about 7 meg. Can you take an attachment of that size?

Mark Z