Hi
I would replace the tip31 and instead use a BD324
,
To: yamahacs80@...
From: mborish_2000@...
Date: Thu, 26 Mar 2009 16:44:01 +0000
Subject: [yamahacs80] Help with 8.5v rail
A few months ago, I accidentally shorted the 8.5v rail to ground while calibrating VR723. (I know, I'm an idiot.) Common sense told me to take out TR709, check it and replace. I replaced TR709 with a TIP31C as well as IC722 and still have the same problem on the output: 3 volts and some change. I Removed the lead and get about 7.8 volts with the PSU unloaded and a little bit less with a 1M ohm load. The metal oxide resistor reads about 8/10 of an ohm in circuit.
I was wondering if anybody could post what some of the voltages are in their CS-80 PSU for me. It would be nice if I could have the voltages from TR711, TR710, D713 and IC722
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