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Old 16th March 2012, 07:42 AM   #1
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Default CD fixed and variable outputs

Dear
My CD has two outputs fixed and variable. I want to do wiring mods
in such a way as to be able to use the direct output without muting transistors and still use the variable output with muting.
As i do not have the CDP service manual or schematics, I would be grateful if anyone could help me to work this out based only on the CDP photos I attach herein

Thanks in advance

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Old 23rd April 2012, 04:35 AM   #2
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Anyone can help?
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Old 23rd April 2012, 05:53 AM   #3
Mooly is offline Mooly  United Kingdom
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See which pair of transistors are related to the fixed output and just remove them.

The ones at the right hand side in the top pictue look like the level translation and logic drive so it is NOT that pair.
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Old 24th April 2012, 08:21 AM   #4
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I see two pairs, one next to the cable and the other on the left (top picture), but each pair seem to be related to each channel of the fixed output.
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Old 24th April 2012, 11:06 AM   #5
Mooly is offline Mooly  United Kingdom
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If each pair seems to be related to just one channel (L or R) then that means the two transistors are used to get a "better" depth of mute. If so then maybe the variable output isn't muted at all.

Your pictures aren't quite clear enough to tell how it all connects without spending a great deal of time tracing it out and flipping between pictures.

Just experiment, you won't harm anything by pulling the transistors out. Just make sure you know which type goes where.

What is the make and model ? Can we not come up with a circuit.
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Old 25th April 2012, 06:59 AM   #6
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It's Kenwood dp-7050. Unfortunately, i have been unable to find its service manual or schematics on the net.
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Old 25th April 2012, 07:25 AM   #7
Mooly is offline Mooly  United Kingdom
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This is slightly different but you can see the general idea. Just trace the circuit out and remove the appropriate transistors. This shows how two pairs of transistors are used to obtain a "deeper" level of muting.
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