11-01-2017, 09:33 AM
Hi Haydon / Lou,
I have the same problem with my D-3800. It has happened intermittently for several years now, but I have never tried to track it down until now.
It was solidly "off the air" last night, so I opened it up. Then I found this post on AUSTECH FORUMS
http://www.austech.info/showthread.php/9...elp-needed
which gave a link to the circuit diagram, information in the thread saying that the main control IC is an LM723, and some other helpful suggestions.
I heated the main PCB with a short burst from my heat gun, and it came to life straight away this morning.
I will measure pin voltages on the LM723 in normal operation and post them later.
In the meantime, can you tell me if you have made any progress on this problem?
Best wishes,
Lew.
I have the same problem with my D-3800. It has happened intermittently for several years now, but I have never tried to track it down until now.
It was solidly "off the air" last night, so I opened it up. Then I found this post on AUSTECH FORUMS
http://www.austech.info/showthread.php/9...elp-needed
which gave a link to the circuit diagram, information in the thread saying that the main control IC is an LM723, and some other helpful suggestions.
I heated the main PCB with a short burst from my heat gun, and it came to life straight away this morning.
I will measure pin voltages on the LM723 in normal operation and post them later.
In the meantime, can you tell me if you have made any progress on this problem?
Best wishes,
Lew.