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Old 11th February 2013, 07:12 PM   #81
Mooly is offline Mooly  United Kingdom
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If you don't see anything on the RF (not that you should) when it does drop out then the problem is looking a bit deep seated and obscure.

I guess the next step is to use the scope to monitor the audio as early in the process as possible, which will be the output of the DAC's.
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Old 20th February 2013, 02:28 PM   #82
nuryev is offline nuryev  Australia
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Where on pcb can i monitor the DAC's output while cd player is connected and playing a cd?
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Old 20th February 2013, 02:36 PM   #83
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You would have to look at the circuit and see where the analogue stages connect to the DAC. Just follow the circuit back from the output sockets until you come to the DAC testing along the way.
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Old 20th February 2013, 02:53 PM   #84
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thanks for the quick reply. Do you recommend a scope or DVM for DAC output testing?
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Old 20th February 2013, 02:54 PM   #85
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Scope every time
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Old 20th February 2013, 03:37 PM   #86
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Thanks will keep you posted
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Old 22nd February 2013, 08:20 AM   #87
nuryev is offline nuryev  Australia
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Quote:
Originally Posted by Mooly View Post
Good luck.
(have a read at post #10 here,)
UK Vintage Radio Repair and Restoration Discussion Forum

And watch the Molykote... if its like the stuff I remember from video mech repair day it gets everywhere.
I tried accessing the page via the link you provided but was denied.
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Old 22nd February 2013, 08:29 AM   #88
Mooly is offline Mooly  United Kingdom
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Still works OK here but here's the latest URL,

UK Vintage Radio Repair and Restoration Discussion Forum
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Old 22nd February 2013, 11:42 AM   #89
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Thanks for the suggestion to work back from outputs.
I have resoldered the TCA driver chips - as well as all caps and resistors on laser board, around the outputs and before and after the DAC chip. Removed opamps and tried with each channel disabled to eliminate the possibility of opamp failure.
I detected a 2.5v presence at the DAC pin 26 where 5v should be present....??
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Old 22nd February 2013, 11:58 AM   #90
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Is this 2.5 volts at some different value when the fault occurs ? In other words does it alter according to the fault.
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