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@ Normal playback
It is confirmed that E7-PROM value is correct in Test mode:
MJ-L7
Does indication of playback time advance?
ve
Is Pin 93 of C1401 set to 1.0V+0.3V, with low-reflection
disc (recording possible) inserted?
NO
Does the disc rotate correctly?
YES
Does the read-in switch turn ON in the most inner
circumference of pickup in Test mode? (Is Pin 30 of
1C1401 at "L" level?)
pe
Check SW1953, the soldered portion of the MD MECHA
SW Assy, and portion around Pin 1 of CN1601.
Does the system try to repeatedly read TOC when low-
NO
reflection disc is played back?
Unused new discs have no TOC recorded. Replace with
a recorded low-reflection disc.
YES
Use a high-reflection disc to confirm the position of the
read-in switch in Measurement mode among the
adjustment items.
@ Audio playback circuit
No sound is output even though indication of playback time advances during playback in Normal mode:
Do audio output waveforms appear for Pins 21 to 24 of
NO
Check Pins 76, 77, 78 and 80 of IC1201, and Pins 31,
32, 35 and 40 of IC1701.
161701?
y=
Do audio output waveforms appear for Pins 22 and 24 of
NO
CN1902?
Check IC1201.Check the connection line between
1C1701 and CN1902.
Ve
Check the substrate of the MD MAIN PCB Assy.
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