Hafler DH101/DH200 request repair help

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davis53

Member
Joined 2020
#1
I have a Halfer DH 101/DH200 that I built from a kit in the 80's. I am a novice about electronics.



The combo was working well and then one side of the stereo channel went dead. I switched to mono and both sides produced music for several weeks. Now the system is dead no sound from turntable, tuner, etc. I checked the fuses, but are OK. Checked connections cables, power, etc., nothing.



The question is how can I check if the pre-amp or amp has failed? I have only a multi meter, and limited knowledge. Any deduction way to check this?
 
#2
The first clue is that when the first channel died and you switched to mono, that you got sound from both speakers. This indicates that both channels of the amplifier are working, so the problem is more likely with the preamp.

You can also trace backwards from the mono switch, and should be able to eliminate anything after it. It is most likely that whatever failed on the first channel also failed on the second channel.

A signal injector could be of use for tracing backwards from the mono switch. If you have a circuit diagram posting it would help people to suggest areas that may be an issue.

Tony.
 
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