2-5
2-5
CS 46 436
PLAY
pressed ?
µ
P switches
DC/DC converter on
(POWER=L)
µ
P sends
power-on reset
(PORES=L)
µ
P sends
parameter/settings
to CD7 and NPC
µ
P sends
command to CD7:
“move slide inside”
inner switch
closed within
6sec ?
µ
P sends
command to CD7:
“move slide outside”
µ
P sends
commands to CD7:
“switch laser on”
“slide servo off”
“focus servo on”
inner switch
open within
0.3sec ?
focus
found within
3.2sec ?
focus
not found
2 times ?
µ
P sends
command to CD7:
“disc motor to 75%”
disc motor at
75% of nom.speed
within 2sec ?
µ
P sends
command to CD7:
“radial loop on”
subcode
found within
10sec ?
release MUTE
Start-up procedure for ext.DC supply,
no accu inserted, hold-switch in off pos.,
resume-mode off, CD-lid closed.
increment counter
“focus not found”
N
N
N
N
N
N
Y
Y
Y
Y
Y
Y
Y
N
POWER OFF
(stand-by)
display shows
“no disc”
start-up stopped
display shows
“Error”
start-up stopped
PLAY-MODE
turntable and
disc free ?
N
N
Y
lens
movement ?
Y
CHECK
LIGHTPATH
CHECK
FOCUS PATH
N
triangle
voltage on
focus actuator
OK ?
Y
N
connections
to/from CD-drive
OK ?
Y
replace
CD-drive
repair
connections
triangle
voltage on
pin 42 of
7950 ?
check
servo driver 7950
N
Y
check
CD7 7830
Y
N
remove
obstruction
replace
CD-drive
mechanical
obstruction ?
START-UP PROCEDURE
MAIN FAULT FINDING GUIDE
focus found ?
N
Y
enter
service program
“FOCUS TEST”
N
Y
enter
service program
“DISC MOT. TEST”
radial tracking
OK ?
disc speed
OK ?
N
Y
N
enter
service program
“RADIAL TEST”
errors during
playback ?
Y
enter
service program
“PLAYBACK TEST”
CHECK
CD-DRIVE AND
SERVO CIRCUITS
CD-DRIVE AND
SERVO CIRCUITS
OK
check/repair
FOCUS PATH
check/repair
TURNTABLE
MOTOR PATH
check/repair
RADIAL
TRACKING
FUNCTIONAL
TEST
FAULT FINDING GUIDE FOCUS PATH
