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[MDP-800] Repair
https://forum.lddb.com/viewtopic.php?f=56&t=10484
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Author:  cplusplus [ 07 Aug 2022, 03:50 ]
Post subject:  [MDP-800] Repair

I bought a broken MDP-800 yesterday. The seller said there was no audio. I opened it up and was greeted with the following:
Attachment:
MDP-800_1.jpg
MDP-800_1.jpg [ 92.84 KiB | Viewed 709 times ]

Attachment:
MDP-800_2.jpeg
MDP-800_2.jpeg [ 58.86 KiB | Viewed 709 times ]

Attachment:
MDP-800_3.jpeg
MDP-800_3.jpeg [ 55.13 KiB | Viewed 709 times ]

Attachment:
MDP-800_4.jpeg
MDP-800_4.jpeg [ 139.35 KiB | Viewed 709 times ]


The following caps were leaking:
Servo section: C299, C428, C430 47uF (I have seen these leak in a MDP-600 as well)
Audio section: C507 47uF
Power section: C707 100uF
Power supply: C31 C35 100uF

All of these capacitors were 35V.

After cleaning up all the leakage and replacing these, there was still no audio. +8VDC to audio section was somewhere around +2VDC. I replaced the +8V regulator in the power supply and was relieved to hear audio.

On to the adjustments now (once I find wherever my MDP adjustment cable is hiding). Unless the mechanical adjustments have drifted, it shouldn't take long since the only servo adjustments available are tilt balance for A and B.

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