Yes
• Normal playback
Is initialization performed normally when high reflection disc is
played back?
Does disc rotate normally?
No
No
Check IC1201
Is lead-in switch turned on in the TEST mode when the pickup is on
the innermost periphery (Is the pin 6 of OC1401 on L level?)
No
No
Check SW1953, mechanism switch PWB soldering joint, and
CNP1601 pin 1 periphery.
Is an attempt to read repeatedly the TOC section of low reflection
disc made?
Since the TOC section has not been recorded on the new disc,
replace it with recorded low reflection disc.
No
Yes
Check the assembly position of "lead-in switch (sw1953)
Yes
When it has been confirmed that EEPROM value is normal in the TEST mode
Does the playback time display advance?
• Audio playback circuit
Yes
No
Is audio output waveform observed on the pins 22 and 24 of
CNS1902?
Check connection between IC1701 and CNS1902.
No
Check the main PWB.
Yes
When sound is not output although the playback time display advances during
(Except DM-3090)
playback in the normal mode.
Is audio output waveform observed on the pins 24 to 26 of
IC1701?
Check the pins 70, 71, 72 and 74 of IC1201, and the pins
12, 16, 17, and 19 of IC1701.
DM-3090
21
TROUBLE SHOOTING
DM-3090(K)
COVER
97.11.29
0:19
AM
y [ W
30
Summary of Contents for DM-3090
Page 31: ...DM 3090 31 PARTS DESCRIPTIONS ...