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MJ-L7
e@ Recording/playback operations
Insert a low-reflection disc to confirm audio output during playback in Normal mode, then set the system to Recording/Playback Test mode.
N
The system does not record from the starting address.
ye
Does RF waveform appear for TP1112 or Pin 23 of
YES
I¢1201 when the disc is played back after recording ?
Ve
Are recording levels of Pins 3 and 26 of IC 1401 and Pin
NO
22 of 1C1101 different from playback levels ?
ie
Does RFF pattern appear for Pin 60 of 1C1201 ?
=
Check IC1251 and Q1251 to 1254 to see soldering of
the flexible PCB for deletion Magnetic Head.
NO
Do input waveforms appear for Pins 18 and 20 of
CN1902 during AUX input recording in Normal mode ?
YES
NO
Are input waveforms supplied to Pins12 to 15 of
NO
1C1701?
YES
Check Pins 76 to 79 of 11201 and 1C1701 and
surrounding portions.
@ The focus servo does not function
Is waveform of Pin 30 and 32 of IC1101 correct at the
NO
focus gain rough adjustment step in Test mode?
ve
Is Pin 81 of 1C1201 changes from "H" to "L"?
NO
Does pulse waveform appear for Pin 82 of 1C1201?
Ve
Does pulse waveform duty of Pins 52 and 53 of 1C1201
NO
change? Do waveforms change at Pin 7 of |C1602?
T=
Do waveforms change at Pins 17, 18 and 19 of IC1601?
ie
Do waveforms of Pins 5 and 7 of CN1101 change?
a
NO
NO
OK
56
f
Is the disc recording enabled ?
Check IC 1401 and 1C1101 and surrounding portions.
t
ima
7
Check IC 1201 for defective soldering.
Check the substrate of the MD MAIN PCB Assy.
Check connection between IC 1701 and CN1902.
Check waveforms of Pins 13 and 15 of 1C1101 and
soldering.
Check waveforms of Pins 8 and 9 of 1C1201 and
soldering.
Check soldering and parts of 1C1201 and IC 1602.
Check soldering and parts of IC1601.
Check pickup assy and CN1101.
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