Start-Up Procedure - Philips AZ7261 Service Manual

START-UP PROCEDURE

Start-up procedure for ext.DC supply,
POWER OFF
no accu inserted, hold-switch in off pos.,
(stand-by)
resume-mode off, CD-door closed.
N
PLAY
pressed ?
Y
µP switches
DC/DC converter on
(POWER=L)
µP sends
power-on reset
(PORES=L)
µP sends
parameter/settings
to CD7
µP sends
command to CD7:
"move slide inside"
inner switch N
closed within
6sec ?
Y
µP sends
command to CD7:
"move slide outside"
inner switch
N
open within
0.3sec ?
Y
µP sends
commands to CD7:
"switch laser on"
"slide servo off"
"focus servo on"
focus
N
found within
3sec ?
Y
µP sends
command to CD7:
"init auto-sequencer"
auto sequencer
error handler
Y
auto sequencer
error ?
radial check
N
sequencer ?
error handler
Y
radial check
error ?
Y
subcode check retry
N
radial check ?
error handler
Y
subcode check N
error ?
retry
Y
N
subcode check
?
release MUTE
N
display shows
"Error"
PLAY-MODE
start-up stopped
CS 46 167
2-5
MAIN FAULT FINDING GUIDE
CHECK
CD-DRIVE AND
SERVO CIRCUITS
enter
service program
"FOCUS TEST"
N
focus found ?
Y
enter
service program
"DISC MOT. TEST"
N
disc speed
OK ?
Y
enter
service program
"RADIAL TEST"
N
radial tracking
OK ?
Y
focus search
error handler
enter
service program
"PLAYBACK TEST"
retry Y
focus search ?
N errors during Y
playback ?
N
retry Y
CD-DRIVE AND
SERVO CIRCUITS
OK
N
display shows
"no disc"
start-up stopped
FAULT FINDING GUIDE FOCUS PATH
CHECK
FOCUS PATH
turntable and N
disc free ?
Y
mechanical
obstruction ?
check/repair
FOCUS PATH
lens
N
movement ?
Y
focus actuator
CHECK
LIGHTPATH
check/repair
TURNTABLE
MOTOR PATH
connections
to/from CD-drive
check/repair
RADIAL
TRACKING
FUNCTIONAL
TEST
2-5
N
Y
remove replace
obstruction CD-drive
triangle
N
voltage on
OK ?
Y
triangle
N N
voltage on
pin 42 of
OK ?
7950 ?
Y Y
replace repair check
CD-drive connections servo driver 7950
check
CD7 7830