CD-MD3000H/CD-MD3000W
MD SECTION
When MD fails to operate
If the objective lens of optical pickup is contaminated, MD may fail to operate. At first, clean the objective lens to check playback
operation. If MD fails persistently to operate, perform checks as follows.
If dust or foreign substance is accumulated on the pickup lens, playback is disturbed and indication of TOC (content of tracks) may
be disabled. Before adjusting check that the lens is clean. If the lens is contaminated, treat it as follows.
Turn off power supply, impregnate the lens cleaning paper with a small quantity of isopropyl alcohol, and gently wipe the lens with
it with due care so that the lens is not damaged. At this time do not touch the lens directly with your finger.
Is disc loading normal?Check as stated in item "disc Loading is not normal".
No
Yes
Is playback state set when the MD PLAY/PAUSE button is Check as stated in item "Playback state cannot be set".
pressed?No
Yes
Is audio output normal?Check as stated in item "Audio playback circuit".
No
Yes
Is record and playback operations normal?Check as stated in item "Record and playback operations".
No
Y Playback state cannot be set.
Is it impossible to set both high reflection disc and low
Check as stated in item "TEST mode check".
reflection disc to playback state?No
YesNo
Only the high reflection disc cannot be played back.Only the low reflection disc cannot be played back.
YesYes
Is 1.3V to 1.6V applied to the pin 93 of IC1401 with the highIs 1.6V to 1.9V (record enabled) or 2.0V to 2.3V (record disabled)
reflection disc inserted?applied to the pin 93 of IC1401with the low reflection disc inserted?
Yes
No
YesNo
After re adjustment check as stated in item "Normal playback".Check SW1931 loading motor PWB, and CN1931.
Y Audio playback circuit
When sound is not output although the playback time display advances during playback in the normal mode.
Is audio output waveform observed on the pins 24 and 26 ofCheck the pins 70, 71, 72 and 74 of IC1201, and the pins
No12, 16, 17, and 19 of IC1701.
IC1701?
Yes
Is audio output waveform observed on the pins 26 and 28 ofCheck connection between IC1701 and CN1501.
CN1501?No
Yes
Check the main PWB.
� 90 � |
ACEC
