Cd Startup Procedure - Philips AZ1009 Service Manual

CD STARTUP PROCEDURE

supplied to
Decoder delivers CLOCK -
frequ. 4.23MHz to µP.
µP- RESET line → high
µP init. Decoder 7801.
LOW
(CD-RESET)
after 100µs?
Init. 7801 for ext. DAC
µP moves slide inside
(4s time-out starts)
inner switch
µP moves slide outside
(0,2s time-out starts)
inner switch open?
Door closed?
Disc motor 100ms on
FOCUS search on
focus found?
µP initializes Decoder
and Servo IC:
-start turntable
-adj. track bal. and gain
-read subcode (TOC)
display shows
max. trackno.
STOP MODE
CS 49 116
CD switched on
BEGIN
(mode switch)
+A(CD)
N
CD part?
Y
Level on
pin23 HIGH
Init. 7801 for int. DAC
N
N
4s time-out over?
closed?
Y Y
N
N
0,2s time-out over?
Y Y
slide off
Display shows
N
Y
Laser on
N
N
3s time-out over?
Y
TOC N
found?
Y
3-7
Remark: To check focus servo, slide servo, track servo and turntable
use service test program
- Battery empty?
- check +A,
- mode switch o.k.?
check: - +A(CD), +B(CD), +LASER, +M,
check: - door switch
Y
check: - Laser light on ?
check: - Motor control pin 27 of Decoder 7801 and
startup proc.
stopped,
display shows
STARTUP FAILED
- time constant of reset circuit
- Pin 32 of µP 7800 HIGH ?
- Pin 30 of µP 7800, if 4.23 MHz o.k.
Check pin 38 of 7803 and LASER CONTROL circuit
- Focus Servo
Disc Motor driver 7805
- HF Signal by using service testprogram
CDstartup EVA, 080997