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MJ-L7
7.2.2 Troubleshooting
@ MD does not Operate
MD may not operate if the objective lens of the Light Pickup is soiled. Clean the objective lens, then check playback operation. If the
symptom still persists, check the points according to the flowchart below.
If dust or foreign matter has deposited on the Pickup Lens, the system may skip tracks or may not display TOC (content of song titles).
Confirm that the lens is clean before making adjustment. If the lens is soiled, perform as follows:
Switch the power of the unit OFF. Apply a small amount of isopropyl alcohol to the lens cleaning paper and clean
the lens carefully. Be careful not to damage the lens. Do not touch the lens directly with your hand.
Does the power turn ON at the MD position by pressing
.
F
the MD button of the remote controller or the MD MAIN
Ne
rab seeording ao CONES Cr ME:DOES NST TMRN
PCB Assy.
:
ee
Le
Does the system play back when the MD PLAY/PAUSE
NO
Check according to "THE SYSTEM DOES NOT
Is disc loaded correctly?
Check according to "DISC LOADING IS INCORRECT".
im
Is recording/playback operations correct?
OPERATIONS".
@ Power of MD does not turn on
Does the system operate correctly when the MD button
YES
Check the remote controller (XC-L7's accessory) and
is pressed?
the substrate of the MD MAIN PCB Assy.
y NO
Is +10 — 18V supplied to Pins 15 and 16 of CN1902?
ie
Are pulses supplied to the base of Q1801?
ve
Is Pin 62 of 101401 set to +3.15V?
y
Is a pulse of 8.4672MHz applied to Pin 15 of C1401?
ie
Are pulses output from Pin 34 of 101401?
Ve
Check CN1902 and the substrate of the MD MAIN PCB
Assy.
NO
Check the substrate of the MD MAIN PCB Assy and
CN1902.
NO
Check the substrate of the MD MAIN PCB Assy,
CN1902 and IC 1801.
ft
NO
I
Check Q1801 and surrounding portions.
NO
Check IC1201.
NO
Check IC 1401.
i
53
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