[Chuck]

On Mon, 22 Sep 2008 06:42:56 -0400, (J. B. Wood)
wrote:

In article , "J.B. Wood"
wrote:

Hello, all. I have the subject audio preamp/tuner that I purchased way
back in 1991. It has worked flawlessly over the years but yesterday
started randomly power cycling (the unit uses a relay) without operator
intervention. When it's on and feeding the companion GTP-500 II audio
power amp everything works audio-wise except that in addition to the
power cycling, infrared remote control has also been rendered
inoperative. Has anyone seen this or similar behavior in other
products? I currently do not have the service manual. I did unplug the
unit from the AC line for 24+ hours but upon restoring AC power the
problem continues. Thanks for your time and comment.

Hello, and wrt the above I should have said "companion GFA-545 II audio
power amp." Sorry for the confusion. Sincerely,

John Wood (Code 5550) e-mail:
Naval Research Laboratory
4555 Overlook Avenue, SW
Washington, DC 20375-5337



My guess would be an open electrolytic capacitor in the power supply.
I no longer have the service manual for this piece, so if someone
could post the schematic on a website, I could be of more assistance.
Chuck