Uncategorized

.. continuation of Radio Head Unit - Repair II

CD port not working
Observed on: 1 EUDM Radio
Fixed by: PCB repair, replacement of OP amp
State: Fully understood

Acid damage to the traces around the CD port OP amplifier can cause the connection to the CD changer to fail.

severe trace damage around the CD port OP amp mounting point

The CD port should be removed and cleaned. In addition to repairing ...

.. continuation of Radio - Repair

Too little Volume and Distortions increasing with Volume
Observed on: 1 EUDM Radio
Fixed by: OP amp replacement
State: Fully understood

The audio signal path on these radios is fully analogue with several operational amplifiers at various stages. One of them is IC303, a 20 V, 10 MHz quad operational amplifier from JRC/NJM: NJM2060M.

IC303 at the rear end of the lower PCB

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