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Strange PC102 Board [message #28450]

Mon, 14 February 2022 20:13

JDinPA17603
Messages: 69
Registered: May 2018
Location: Lancaster, PA

Member

Amp is end of A series A4.
Background 100uf white Mallory cap had split amp had set for number of years. In consult with the owner we decided to replace all of the Mallory caps that were in the amp and then other parts as needed. Long story short - 95% of all components on the board were more than 20% out of tolerance and that was from the stated values. So I pulled up my PC102 schematic and where the schematic showed 3 ea of 25 uf these boards had 4 and no a 25 had not been subbed for a 10 uf or for the 100 uf.
Upon further digging we find we have 25 fixed resistors instead of 23. I've taken shots of the component and trace side of the board trying to trace through but to be honest my head is swimming right now.
The board just says Ross PC102 but like I said totally different from the PC102 schematic I have.
If anyone can shed light on this or provide a schematic it would be a great help.
Thanks in advance.

Old Us Navy Vietnam Vet
Playing for my own enjoyment and irritation of the neighbors.

[Updated on: Mon, 14 February 2022 20:24]

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[Message index]

		Strange PC102 Board By: JDinPA17603 on Mon, 14 February 2022 20:13
		Re: Strange PC102 Board By: stevem on Tue, 15 February 2022 08:05
		Re: Strange PC102 Board By: JDinPA17603 on Tue, 15 February 2022 17:24
		Re: Strange PC102 Board By: stevem on Wed, 16 February 2022 11:38
		Re: Strange PC102 Board By: JDinPA17603 on Tue, 22 February 2022 08:47
		Re: Strange PC102 Board By: stevem on Thu, 24 February 2022 07:03
		Re: Strange PC102 Board By: JDinPA17603 on Mon, 28 February 2022 20:20
		Re: Strange PC102 Board By: JDinPA17603 on Mon, 18 July 2022 03:10
		Re: Strange PC102 Board By: stevem on Mon, 18 July 2022 05:56
		Re: Strange PC102 Board By: JDinPA17603 on Mon, 18 July 2022 11:11
		Re: Strange PC102 Board By: stevem on Tue, 19 July 2022 06:46
		Re: Strange PC102 Board By: stevem on Tue, 19 July 2022 15:54
		Re: Strange PC102 Board By: JDinPA17603 on Tue, 19 July 2022 19:16

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