Marantz 2235b- P800 PSU problem - diyAudio
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Old 15th February 2015, 04:51 PM   #1
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Default Marantz 2235b- P800 PSU problem

Hello all,

I'm quite the newbie at this so bear with me. I'm giving a go at a Marantz 2235B. It had intermittent sound on right side. Changed the vol pot. Changed the relay and recapped all the supply board due to leakage. Now I get no power from the 13V supply on the P800 board. Caps are working (at least charging up and holding). Look at the schematics and my issues are pointed. The bottom part working fine and getting 35V and other reads as advertised.

Another issue is that resistor R807 (150R/5W) is dropping the whole 41V! is that normal?

L
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Old 15th February 2015, 05:25 PM   #2
Ketje is offline Ketje  Belgium
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Well I see three possebilities.R807 open or C805 shortcircuit or, if the H804 is mounted on a heatsink,the insulation broken.
Mona
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Old 15th February 2015, 05:38 PM   #3
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Found it!! Just like Ketje said, I shorted the heatsink! Thanks
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Old 16th February 2015, 02:02 AM   #4
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OK, so I got power to am/fm tuner and main amp. Problem is still there?! Unit will run for almost exactly 90min, then right side goes out. Should I try to bypass the main speaker switch? Can I use an AC meter to see if the signal reaches the main amp?
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Old 16th February 2015, 12:09 PM   #5
Ketje is offline Ketje  Belgium
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Normally one measures one side and compairs it with the other side to see the difference en probably where it goes wrong.
Or a sig.generator to inject a signal to find out from where it stops comming out.
Mona
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Old 16th February 2015, 01:24 PM   #6
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I have a sig generator and oscilloscope on order. I will be taking apart the main/remote/FM muting board and testing it first.thanks
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