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PC900 and PC105 board clarifications [message #29433] Wed, 12 February 2025 16:13 Go to next message
urk12345 is currently offline  urk12345
Messages: 2
Registered: December 2024
Junior Member
I was hoping someone could help clarify a couple of components on the PC900 and PC105 board schematics that are hard for me to read:

PC900
Q909 - Transistor - FZ352?  is that correct?
C900 - Capacitor - 01?  Not sure if a decimal isn't showing up?  0.1 or 0.01 value?

PC105
C111 - Capacitor - I'm not seeing this on the schematic.  Am I blind or did they skip C111 and go right to C112?

Thanks!

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Re: PC900 and PC105 board clarifications [message #29439 is a reply to message #29433] Sun, 16 February 2025 06:21 Go to previous messageGo to next message
stevem is currently offline  stevem
Messages: 4849
Registered: June 2004
Location: NY
Senior Member
C900 is a .1 cap.

The npn transistor used as a diode is FZ952.

I can’t find a C111 cap on either of the two revisions of PC 105 on this web site or in my personal schematics that I have.

Why are you asking about FZ952?
Is your 8volts positive not right?

Note that in these amps that the 8 volt negative regulator tracks the positive one.

If your positive is not right neither will your negative be right.

[Updated on: Sun, 16 February 2025 08:29]

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Re: PC900 and PC105 board clarifications [message #29442 is a reply to message #29439] Mon, 17 February 2025 11:44 Go to previous message
urk12345 is currently offline  urk12345
Messages: 2
Registered: December 2024
Junior Member
Thank you, SteveM.

I'm restoring a Kasino Club 4 that was a victim of a mouse nest.

I've replaced the chewed wiring to the boards, replaced both large caps, and installed a 3-prong plug and in-line fuse holder. Upon 1st power up - I'm blowing fuses.  I read here that could be a bad output transistors so I'm working through the schematics when I ran into these oddities.

I also need to replace the RCA cables from the reverb tank to the PCB.  I guess the mice weren't fans of reverb! Would not having the RCAs connected cause any issues?

I don't have any history on the amp so I have no idea if it was working properly even before the mouse nest issue.

I'll check voltages on the FZ tonight.

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