PHILIPS AZ7562
Instrukcja Serwisowa

2-5

2-5

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

FUNCTIONAL TEST

Y µP sends command to CD7: �radial loop on�

Y

CD-DRIVE AND SERVO CIRCUITS OK

subcode found within 10sec ?

N

Y

release MUTE

PLAY-MODE

display shows �Error� start-up stopped

display shows �no disc� start-up stopped

CS 46 436