Normal Playback; Audio Playback Circuit - Kenwood DM-3090 Service Manual

• Normal playback

When it has been confirmed that EEPROM value is normal in the TEST mode
Is initialization performed normally when high reflection disc is
played back?
No
Does disc rotate normally?
Yes
Is an attempt to read repeatedly the TOC section of low reflection
disc made?
Yes
Check the assembly position of "lead-in switch (sw1953)

• Audio playback circuit

When sound is not output although the playback time display advances during
Is audio output waveform observed on the pins 24 to 26 of
IC1701?
Yes
Is audio output waveform observed on the pins 22 and 24 of
CNS1902?
Yes
Check the main PWB.
TROUBLE SHOOTING
Does the playback time display advance?
Yes
Check IC1201
Is lead-in switch turned on in the TEST mode when the pickup is on
No the innermost periphery (Is the pin 6 of OC1401 on L level?)
Check SW1953, mechanism switch PWB soldering joint, and
CNP1601 pin 1 periphery.
Since the TOC section has not been recorded on the new disc,
No
replace it with recorded low reflection disc.
(Except DM-3090)
Check the pins 70, 71, 72 and 74 of IC1201, and the pins
12, 16, 17, and 19 of IC1701.
No
Check connection between IC1701 and CNS1902.
No
DM-3090
No
No
playback in the normal mode.
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