Yamaha CS80 group photo

Yahoo Groups archive

Yamaha CS80

Index last updated: 2026-04-05 00:20 UTC

Message

Help with 8.5v rail

2009-03-26 by mborish_2000

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

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.