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Old 19th October 2008, 03:36 PM   #1
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Default Marantz CD 67 (no output)

Hi!

I have recently bought another 67 after mods on my last one went a bit pear shaped. I modded the power supply last week using the mod sheet from rays audio page which went very successfully, and this week decided to do the opamps section. Unfortunately upon testing there was no sound output from the RCA,s, so I checked the other sources, leads etc, and these all worked fine. I have used all relevant precautions including: anti staic wrist strap, mat as well as taking correct precautions for heat exposure so don't believe this to be a problem.

Just wondered if anyone had any suggestions as to what the problem may be?

Many thanks!

Ross
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Old 19th October 2008, 05:46 PM   #2
poynton is offline poynton  United Kingdom
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ICs the correct orientation ??

Check voltages round the chips


Andy
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Old 20th October 2008, 10:34 PM   #3
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Hi andy!
Sorry the reply is so late been pretty busy! All voltages are fine and the chips are both orientated correctly!

I have looked at the circuit diagrams in my service manual and it seems that when all the correct components are removed the HDAM circuits are effectively bypassed. However! it does seem that there is no way for the signal to get from the op-amps to the RCA,s and there is no indication that anything else is needed on the mods sheet. I have looked at the pictures on ray,s website and there seems to be two long white wires running from U216 and U217 to two points near to the RCA,s! I'm guessing that these wires are the missing link in my player? please confirm and let me know the correct points to which these wires would be fitted (If you know)! If not does anyone else have any idea?


Many thanks!

Ross
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Old 20th October 2008, 10:40 PM   #4
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by Rosscopecotrain
Hi andy!
Sorry the reply is so late been pretty busy! All voltages are fine and the chips are both orientated correctly!

I have looked at the circuit diagrams in my service manual and it seems that when all the correct components are removed the HDAM circuits are effectively bypassed. However! it does seem that there is no way for the signal to get from the op-amps to the RCA,s and there is no indication that anything else is needed on the mods sheet. I have looked at the pictures on ray,s website and there seems to be two long white wires running from U216 and U217 to two points near to the RCA,s! I'm guessing that these wires are the missing link in my player? please confirm and let me know the correct points to which these wires would be fitted (If you know)! If not does anyone else have any idea?


Many thanks!

Hi Ross

After removing the HDAM components, you should connect the output from the opamps to the output RCA´s with a wire.
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Old 22nd October 2008, 07:36 AM   #5
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I can see from the pictures on rays sight that the wires are located in U216 and U217 but do you know where these wires go to?
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Old 22nd October 2008, 08:40 AM   #6
Thomo is offline Thomo  United Kingdom
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Are you using LM4562 opamps? If so, then simply connect those wires to the rca sockets. That opamp can easily drive cables of 1meter or so.

This then bypasses HDAM and output muting transistors, resistors etc. If you're using other opamps then you may need a 100r (or maybe a little lower, I can't remember) between the opamp output and rca sockets.

Cheers, Lee.
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Old 24th October 2008, 06:36 AM   #7
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Thanks for your help folks!

Take it easy!

Happy tweaking!

Ross
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