START-UP PROCEDURE
POWER OFF (stand-by) Start-up procedure for ext.DC supply, no accu inserted, hold-switch in off pos., resume-mode off, CD-lid closed.
MAIN FAULT FINDING GUIDE
CHECK CD-DRIVE AND SERVO CIRCUITS
FAULT FINDING GUIDE FOCUS PATH
CHECK FOCUS PATH
PLAY pressed ?
N
enter service program �FOCUS TEST�
turntable and disc free ?
N
Y
Y
µP switches DC/DC converter on (POWER=L) µP sends power-on reset (PORES=L) µP sends parameter/settings to CD7 and NPC
focus found ?
N
mechanical obstruction ? check/repair FOCUS PATH
N
Y
Y remove obstruction replace CD-drive
µP sends command to CD7: �move slide inside�
enter service program �DISC MOT. TEST�
lens movement ?
N
Y CHECK LIGHTPATH check/repair TURNTABLE MOTOR PATH
disc speed
inner switch closed within 6sec ? N
N
triangle voltage on focus actuator OK ? Y
N
OK ?
Y
Y µP sends command to CD7: �move slide outside�
connections to/from CD-drive OK ? Y replace CD-drive
N
triangle voltage on pin 42 of 7950 ? Y repair connections check servo driver 7950
N
enter service program �RADIAL TEST�
inner switch open within 0.3sec ? Y µP sends commands to CD7: �switch laser on� �slide servo off� �focus servo on� N
check CD7 7830
radial tracking OK ?
N check/repair RADIAL TRACKING
Y
focus found within 3.2sec ?
N
enter service program �PLAYBACK TEST�
Y µP sends command to CD7: �disc motor to 75%� increment counter �focus not found�
errors during playback ?
Y
N
disc motor at 75% of nom.speed within 2sec ? N focus not found 2 times ? N
