DM-3090(K) COVER 97.11.29 0:19 AM y[W 31
DM-3090
TR OUBLE SHOO TING
Y Record and playback operation
Insert the low reflection disc, and after verifying the audio output in the norm al m ode playback set the record/playback TEST m ode
Recording from start address cannot be perform ed.Check whether the disc is record-prohibited.
No
Yes
Is RF waveform output to the pin 1 IC1201 or TP1274 when
playback is perform ed after recording?Yes
No
Does the level of pins 3 and 26,39 of IC1401 and the pins 9Check periphery of IC1401 and CNS1101.
and 19 of CNS1101 in record state differ from that in
playback state?No
Yes
Does RF pattern appear on the pin 50 of IC1201?Check for IC1201 soldering failure.
NoYes
Check the IC1251, Q1251 to 1254 and CNS1252.
(Except M D-3090 below this item )
Is input waveform given to the pins 18 and 20 of CNS1902 in
AUX input record in the NORM Al m ode?Check the m ain PW B.
No
Yes
Is input waveform given to the pins 3 to 5 of IC1701?Check connection between IC1701 and CNS1902.
No
Yes
Check the periphery of IC1701, check the pins 70, 71, 72,
and 73 of IC1201.
Y Focus servo failure
Is waveform on the pins 27 and 28 of IC1101 norm al in the TESTCheck waveform on the pins 9 and 10 of IC1101 and soldering joint.
No
m ode focus gain coarse adjustm ent step?
(M ANUAL auxiliary adjustm ent m ode : step 9)
Yes
Is level of pin 81 of IC1201 changed from H to L?Check waveform on the pins 8 and 9 of IC1201 and soldering joint.
Is pulse waveform output to the pin 82 of IC1201?No
Yes
Does the pulse waveform duty of pins 18 and 19 of IC1201Check soldering joint and part of IC1201.
No
change? Does waveform of pin 7 of IC1602 change?
Yes
Does waveform change on the pins 12 to 15 of IC1601?Check soldering joint and part of IC1601.
No
Yes
Does waveform change on the pins 2 and 4 of CNS1101?Check CNS1101 and pickup.
No
Yes
OK
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ACEC
KENWOOD
