Philips AZ1050, Service Manual

Page: 12 / 28

CD STARTUP PROCEDURE
4-3 4-3
PCS 99 155
Abbreviations and Pin-descriptions of CD ICs
SERVO PROCESSOR M62475FP
Pin Name Direction Description
1-3 A, B, C Diode array
Æ
Servo processor Current input (central photo diode signal input)
4-5 E, F Diode array
Æ
Servo processor Current input (satellite photo diode signal input)
6 SGT Servo processor
Æ
Track error ampl. Input Signal generator output to track servo, sends 1700Hz for adjustment procedure
7 TE - - Inverting input of track error amplifier
8 TEGain - Gain control pin of track error amplifier
9 TG1 - Track Gain 1 - switch: controls the gain of the track servo amplifier
10 TE out - Track Error amplifier output
11 TC/Shock - Track Cross/Shock detector input
12 TS + - Non inverting input of track servo amplifier
13 TG2 not connected Track Gain 2 - switch: controls the gain of the track servo amplifier
14 TS - - Inverting input of side servo amplifier
15 TS out Servo processor
Æ
Servo driver Output of track servo amplifier
16 SS + - Non inverting input of slide servo amplifier
17 SS - - Inverting input of slide servo amplifier
18 Slide out Servo processor
Æ
Motor driver Output of slide servo amplifier
19 DET. FILTER - Pin for connection of DETection FILter capacitor of ADJUST LOGIC
20 BIAS Servo processor
Æ
external electronic Reference Voltage output Vcc/2 of internal BIAS-generator
21 GND - Ground connection pin (negative supply)
22 MLA/DIS
m
p
Æ
Servo processor
Serial interface Microprocessor Latch control/DIScharge control for adjustment
23 JP1/SG
m
p
Æ
Servo processor Serial interface Jump control line/Signal Generator input line for adjustment
24 MCK
m
p
Æ
Servo processor Serial interface Clock input line
25 MSD
m
p
Æ
Servo processor Serial interface Data input line
26 D
out
Servo processor
Æ m
p Serial interface Data output line
27 C
LPF
- Pin for connection of Low Pass Filter capacitor of ADJUST LOGIC
28 I
REF
- Reference current input
29 V
CC
- Positive supply connection pin (4V - 5.5V)
30 FS
OUT
Servo processor
Æ
Servo driver
Output of focus servo amplifier
31 FS - - Inverting input of focus serco amplifier
32 FEGain - Gain control pin of focus error amplifier
33 FE - - Inverting input of focus error amplifier
34 SGF Servo processor
Æ
Focus error ampl. Input Signal generator output to focus servo, sends 1300Hz for adjustment procedure
35 C
FSR
- Charge capacitor for Focus Search triangle-generator
36 ALPC + - Non inverting input of Automatic Laser Power amplifier
37 ALPC - - Inverting input of Automatic Laser Power Control amplifier
38 ALPC
OUT
Servo processor
Æ
Laser driver
Output of Automatic Laser Power Control amplifier
39 MRC - Connection pin for capacitor of Mirror detector
40 HF Servo processor
Æ
Decoder Output of HF amplifier
41 HFI - Inverting input of HF amplifier
42 ABC - Sum output of amplified A, B and C input (central photo diode signal input)
to external ac-coupling capacitor
SERVO PROCESSOR M65824FP
Pin Name Direction Description
1 Anal. V
SS
- Analog system ground
2 ADJCLK not connected Clock output for servo adjustment; f=88.2kHz
3 LOCK not connected Lock monitor / low disc rotation output
4 CKSEL - System clock selection. Low=8.4672MHz, high=16.9344MHz
5 RESET
m
p
Æ
Signal processor System reset (low level = active)
6 C423
Signal processor
Æ m
p
4.2336MHz clock output
7 C846 not connected 8.4672MHz clock output
8 XI X-Tal
Æ
Signal processor Crystal oscillator input
9 DVSS - Digital system ground
10 XO Signal processor
Æ
X-Tal Crystal oscillator output
11 TEST - Normal / Test selection input. Testmode = high
12 SBCO not connected Subcode serial output
13 SCCK - Shift clock input for subcode data read
14 SYCLK not connected Frame lock status output. Lock = high
15 EFFK not connected EFM frame clock output. Duty = 50%
16 KILLB not connected Digital silence mute output. Digital zero = low
17 EST1 not connected Error monitor output 1
18 EST2 not connected Error monitor output 2
19 HF Servo processor
Æ
Signal processor HF signal input
20 TLC - Slice level control signal output
21 LPF - PLL loop filter
22 Dig. V
DD
- Digital interface power supply
23 DSPS - Digital system power supply
24 SBQS not connected Interrupt signal to read out subcode Q data. Read = low
25 CRCF not connected Subcode Q-channel Cyclic Redundance Check Flag output. CRC o.k. = high level
26 SCAND not connected Subcode sync signal detection. Sync = high
27 PWM
Signal processor
Æ
Motor driver
Disc motor driving (Pluse Width Modulation) output
28 DVDD2 - Digital interface power supply 2
29 DVSS2 - Digital system ground 2
30 MCK
m
p
Æ
Signal processor
m
p interface shift Clock input
31 MSD
m
p
´
Signal processor
m
p interface Serial Data I/O line
32 MLAB
m
p
Æ
Signal processor
m
p interface Latch clock input (internal 22k pull up resistor)
33 EXP1
Æ
Signal processor Versatile input pin (internal 4.7k pull up resistor)
34 EXP2
Æ
Signal processor Versatile input pin (internal 4.7k pull up resistor)
35 CGREF
Æ
Signal processor Charge-pump for LPF reference current input
36 AMPREF not connected Op-amp for LPF reference voltage setting
37 LOUT/DO
Signal processor
Æ
Audio signal output (left channel) / Ext. DAC mode: Audio serial data output
38 LNEG not connected Charge pump output (left channel) / Ext.DAC mode: Wordclock output
39 ROUT/DSCK Signal processor
Æ
Audio signal output (right channel) / Ext. DAC mode: Data shift clock output
40 RNEG/LRCK Signal processor
Æ
Charge pump output (right channel) / Ext.DAC mode: L/R clock output
41 IREF - Current reference
42 Anal. V
DD
- Analog system power supply
N
Y
N
N
N
N
N
Y
CD switched on
(mode switch)
+A(CD)
supplied to
CD part?
Decoder delivers CLOCK -
frequ. 4.23MHz to µP.
µP-RESET line
Æ
high
µP init. Decoder 7801.
inner switch
closed?
4s time-out over?
0,2s time-out over? inner switch open?
Laser on
Disc motor 100ms on
FOCUS search on
focus found? 3s time-out over?
N
startup proc.
stopped,
display shows
µP initializes Decoder
and Servo IC:
-start turntable
-adj. track bal. and gain
-read subcode (TOC)
TOC
found?
display shows
max. trackno.
Y
Y
Y Y
N
Y Y
Remark: To check focus servo, slide servo, track servo and turntable
use service test program
- Battery empty?
- check +A,
- mode switch o.k.?
check: - Motor control pin 27 of Decoder 7801 and
Disc Motor driver 7805
- HF Signal by using service testprogram
check: - Laser light on ?
Check pin 38 of 7803 and LASER CONTROL circuit
- Focus Servo
HIGH LOW
Level on
pin23
(CD-RESET)
after 100µs?
Init. 7801 for ext. DAC Init. 7801 for int. DAC
BEGIN
µP moves slide inside
(4s time-out starts)
µP moves slide outside
(0,2s time-out starts)
STOP MODE STARTUP FAILED
CDstartup EVA, 080997
slide off
N
Y
check: - door switch
Door closed?
Display shows
check: - +A(CD), +B(CD), +LASER, +M,
- time constant of reset circuit
- Pin 32 of µP 7800 HIGH ?
- Pin 30 of µP 7800, if 4.23 MHz o.k.