MD-MT20/20C/20W
– 38 –
Yes
Check whether there is defective solder joint of audio signal
line between IC703 and J703
No
Yes
Is audio wavefrom output from J703 pins 3 and 4.
Check the pins 5 and 6 of IC703.
No
Yes
Is audio wavefrom output from IC703 pins 18 and 19.
Check IC201 pins 70 to 72, pin 74 and IC501 pins 9, 10, 11,
15
No
• Abnormal display
No
Yes
Are the pin 4 (VCC) and pin 5 (GND) normal?
Is waveform output from IC401 pins 9,11,13?
Is waveform output from CN482 pins 6 to 8?
• Playback state cannot be set
Is initialization performed normally in case of high- reflection
disc playback?
Yes
Check between IC401 and
CN482.
No
Check the periphery of IC401.
Does the playback time display advance?
Yes
Position check in INNER mode
Check IC201 and IC202 connection line.
Is the lead-in photointerrupter set to OFF when the optical
pickup moves to the innermost periphery in NORMAL mode?
(Is TP654 in H level?).
Check the lead-in photointerrupter, mechanical flex
PWB soldering and CN601 connection.
No
Ia an attempt to repeat repeatedly the TOC part performed
on the low-reflection disc?
Yes
No
No
Replace the disc.
No
• Audio playback clrcult
When it has been ascertained that the address up to cluster address is normal in the TEST mode.
Yes
Is audio wavefrom output from IC501 pins 19 and 20?
Check headphones jack,and periphery of headphone.
Although the playback time display is acting., no sound is given during playback in the normal mode.
Check for pattern breakage of flexible PWB, check for
defects of display microcomputer (replace the display unit).
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