GX-CH170X/CH170Z
No
Check for breakage of connecting wire for loading motor M981C.
• The disc tray cannot be opened and closed.
Is +7.4V applied to the pin 6 of IC761?
Yes
Check the +7.5V power line.
Does the LCD "?" indication rotate when the main unit
or remote control OPEN/CLOSE button is pressed?
Check the main unit button or remote control.
Yes
Check that the pin 64 of IC901 is in Low state but the pin
1 is in High state when the OPEN/CLOSE button is
pressed. (Tray 1 unloading) (Tray 2 unloading: Pin 64
High, pin 1 Low)
No
No
No
Check that +6V is output to the pin 9 in Tray1 mode and
that +6V is output to the pin 7 in Tray2 mode.
Yes
Yes
No
No
Check the pattern between IC761 and CNP753.
IC761 is defective.
Check IC901.
Is about +6V output between pins 4 and 5 of CNP753?
Yes
Is about +6V applied to the loading motor M981C?
Yes
Check the loading motor M981C and loading
mechanism.
M981C
Motor
operation
Tray1 Open H L 0 +6V Reverse
Tray2 Open L H +6V 0 Forward
Tray1 Close L H +6V 0 Forward
Tray2 Close H L 0 +6V Reverse
IC901 IC761
No
IC901 is defective.
Check that the IC901 pin voltage is as follows:
Pin 1 Pin 64
Disc2 -> Disc1 L H
Disc1 -> Disc2 H L
Yes
No
Check that the IC761 pin voltage is as follows:
Pin 7 Pin 9
Disc1 -> Disc2 0 +6V
Disc2 -> Disc1 +6V 0
No
Check for breakage of wire CNW753 to loading motor M981C.
Is voltage applied to the loading motor M781C?
IC761 is defective. Or check the pattern between pin 64 of IC901 and
pin 1 of IC761, the pattern between pin 1 of IC901 and pin 3 of IC761.
Yes
Yes
The motor M981C is defective.
• Disc change failure.
Is +7.4V applied to the pin 6 of IC761?
Does the LCD "?" indication rotate when the main unit
or remote control DISC CHANGE button is pressed?
Check the main unit button or remote control.
Yes
No
Check the changer mechanism switches.
Disc move failure?
Remains
persistently.
Operation
failure
Pin 1 Pin64 Pin 7
Pin 9
– 12 –
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