Pioneer MJ-L7 Service Manual page 57

MJ-L7
@ The disc motor does not rotate
Do waveforms appear for Pins 58 and 59 of IC1201 and
Pin 1 of 1C1603 at the focus gain rough adjustment step
in Test mode?
y YES
Do waveforms appear for Pins 11 and 12 of C1601 and NO Check soldering of the substrate of the DISC MOTOR
Pins 3 and 4 of CN1602? ASSY of IC1601 and CN1602.
NO Check soldering and parts of Pins 58 and 59 of 1C1201
and the circuits around IC1603.
if YES
Does voltage of positive (+) and negative (-) terminals of
the DISC MOTOR Assy change?
es
Replace the DISC MOTOR Assy.
@ The tracking servo does not function
Do waveforms appear for Pin 1 of 1C1602, Pins 15 and
16 of 1C1601, and Pins 4 and 6 of CN1101 at the focus
gain rough adjustment step in Test mode?
Check soldering of Pins 54 and 55 of 1C1201, IC1602,
1C1601 and CN1101.
Replace the Light Pickup.
@ The slide servo does not function
Check waveforms of Pins 56 and 57 of 1C1201 and Pin 7
of IC1603. Check parts around 1C1201 and IC1603.
Check soldering of 101201 and 1C1603.
Does the pickup move toward the outer and inner
circumference in Test mode?
Tee
Do Pins 56 and 57 of 1C1210 and Pin 7 of IC1603
change when the pickup moves toward the outer and
inner circumference in Test mode?
Le
YES
NO
Do Pins 13 and 14 of 1C1601 and Pins 1 and 2 of
NO
Check waveforms of Pins 56 and 57 of IC1201 and Pin 7
of IC1603. Check parts around IC1201 and IC1603.
Check soldering of 101201 and 1C1603.
CN1602 change when the pickup moves toward the
outer and inner circumference in Test mode?
1 YES
Does voltage of positive (+) and negative (-) terminals of
the Slide Motor change when the pickup moves toward
the outer and inner circumference in Test mode?
Y YES
Check soldering of IC1601 and CN1602.
Check soldering connecting to the Slide Motor.
Check for disconnection.
Replace the Slide Motor.
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