Hitachi DZ-GX20A Service Manual page 63

Troubleshooting > Trouble Diagnosis
Message "NO DISC" appears even if a normal
disc is loaded.
Set to service position (A).
Does the voltage
No
at R7003 (DOOR_SW)
(*1)
vary?
Yes
*1: When the cover of disc insertion block is opened or closed
Replace the MAN
circuit board.
Recognition of disc does not start even if a
normal disc is loaded.
Set to service position (A).
Does the voltage
No
at R7003 (DOOR_SW)
(*1)
vary?
Yes
*1: When the cover of disc insertion block is opened or closed
Replace the MAN
circuit board.
Message "Disc is not formatted. Format the disc
now?" appears even if a formatted disc is loaded.
Replace the disc drive unit
Message "DISC ACCESS" does not disappear
even if a normal disc is loaded.
Replace the disc drive unit.
List of check points
Circuit board
Symptom
(side)
R7003 MAN (B)
Replace the lock unit.
List of check points
Circuit board
Symptom
(side)
R7003 MAN (B)
Replace the lock unit.
4 - 38
Lead wire
Location on
soldered
circuit board
or not
4E Need not
Lead wire
Location on
soldered
circuit board
or not
4E Need not
Message "Write protected. Check disc" appears
even if a disc with no write-protect is loaded.
Replace the disc drive unit.