Citation16 DC ofset raise as it get hot - diyAudio
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Old 7th November 2002, 01:48 AM   #1
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Question Citation16 DC ofset raise as it get hot

HI!
I have checked th output for leak...every thing is OK (no leak)
My trouble is when the amp get hot, the DC ofset climb as high as 400 milivolts!!! the 2 first led glow!!!! I think that the trouble come from the driver board .Any idea???
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Old 11th November 2002, 04:35 PM   #2
csd is offline csd
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I recently got an HK Citation 16 which needed a little TLC.

The pot near the top of each board adjusts the DC offset. Make sure the amp is fully warmed up before adjusting. On my amp, the pot was old and difficult to adjust, so I replaced the pot with a new 10-turn unit. After that I was able to get the offset within +/-10mV.

Craig
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Old 11th November 2002, 08:27 PM   #3
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thanks craig,
I had replaced the trim pot......when the amp is hot....the DC ofset is impossible to adjust......I put some freeze-it on the IC (ua739pc) and the DC fall down.......the IC are in order........i hope to get those this week
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Old 12th November 2002, 11:15 AM   #4
csd is offline csd
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Did you use some contact cleaner on the pins/sockets at the bottom of the board?
Do both channels behave this way?
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Old 12th November 2002, 03:40 PM   #5
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Of course i did craig lollll

on both channels.....the dc ofset still go up when the temperature raise!

thanks

René
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