Philips AZ 2785 Manual de serviço - Página 13
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CD STARTUP PROCEDURE
BEGIN
Remark: To check focus servo, slide servo, track servo and turntable
N
CD switched on?
(mode switch)
Y
+5,+Servo
N
supplied to
CD part?
Y
RESET line becomes
HIGH and µP initializes
Decoder 7801
µP moves slide inside
(4s time-out starts)
N
inner switch
N
4s time-out over?
closed?
Y
Y
µP moves slide outside
(0,2s time-out starts)
N
N
inner switch open?
0,2s time-out over?
Y
Y
slide off
Display shows
N
Door closed?
Y
Laser on
Disc motor 100ms on
FOCUS search on
N
N
Y
focus found?
3s time-out over?
Y
µP initializes Decoder
and Servo IC:
-start turntable
-adj. track bal. and gain
-read subcode (TOC)
TOC
N
found?
startup proc.
stopped,
Y
display shows
display shows
max. trackno.
STOP MODE
STARTUP FAILED
4-3
use service test program
- Battery empty?
- check +5 and +Servo
check: - door switch
check: - Laser light on ? - Check pin 38 of 7803 and LASER CONTROL circuit
- Focus Servo
check: - Motor control pin 37/38 of Decoder 7801 and
Disc Motor driver 7805
- HF Signal
- Signal on pin7 of Decoder 7801
13,3ms
Startup CD97, 970310
Abbreviations and Pin-description of CD ICs
SERVO PROCESSOR
M62475FP
Pin
Name
Direction
Diode array Æ
1-3
A, B, C
Servo processor
Diode array Æ
4-5
E, F
Servo processor
Servo processor Æ
6
SGT
Track error ampl. Input
7
TE -
-
8
TEGain
-
9
TG1
-
10
TE out
-
11
TC/Shock
-
12
TS +
-
13
TG2
not connected
14
TS -
-
Servo processor Æ
15
TS out
Servo driver
16
SS +
-
17
SS -
-
Servo processor Æ
18
Slide out
Motor driver
19
DET. FILTER
-
Servo processor Æ
20
BIAS
external electronic
21
GND
-
m p Æ
22
MLA/DIS
Servo processor
m p Æ
23
JP1/SG
Servo processor
m p Æ
24
MCK
Servo processor
m p Æ
25
MSD
Servo processor
Servo processor Æ
m p
26
D
out
27
C
-
LPF
28
I
-
REF
29
V
-
CC
Servo processor Æ
Servo driver
30
FS
OUT
31
FS -
-
32
FEGain
-
33
FE -
-
Servo processor Æ
Focus error ampl. Input
34
SGF
35
C
-
FSR
36
ALPC +
-
37
ALPC -
-
Servo processor Æ
Laser driver
38
ALPC
OUT
39
MRC
-
Servo processor Æ
40
HF
Decoder
41
HFI
-
42
ABC
-
SIGNAL PROCESSOR
M65821FP
Pin
Name
Direction
1
VDD1
-
2
EMP
not connected
3
SYCLK
not connected
4
LOCK
not connected
5
SCAND
not connected
6
CRCF
not connected
Signal processor Æ
7
SBQS
µP
µP ´
8
MSD
Signal processor
Reset circuit Æ
9
RESET
Signal processor
µP Æ
10
MCK
Signal processor
µP Æ
11
MLA
Signal processor
µP Æ
12-14
MODx
Signal processor
15
VDD2
-
16
IREF
-
Signal processor Æ
17
HFD
µP
18
LPF
-
Servo processor Æ
19
HF
Signal processor
20
TLC
-
21
VSS2
-
22
C846
not connected
Signal processor Æ
23
C423
µP
24
EST2
not connected
25
EST1
not connected
X-Tal Æ
26
XI
Signal processor
Signal processor Æ
27
XO
X-Tal
28
DOTX
not connected
Signal processor Æ
29
DO1
DAC
30
DO2
not connected
31
CKSEL
not connected
Signal processor Æ
32
DSCK
DAC
Signal processor Æ
33
WDCK
DAC
Signal processor Æ
DAC
34
LRCK1
35-36
not used
Signal processor Æ
37
PWM1
Motor driver
Signal processor Æ
38
PWM2
Motor driver
39-41
not used
42
VSS1
GND
4-3
Description
Current input (central photo diode signal input
Current input (satellite photo diode signal input
Signal generator output to track servo, sends 1700Hz for adjustment procedure
Inverting input of track error amplifier
Gain control pin of track error amplifier
Track Gain 1 - switch: controls the gain of the track servo amplifier
Track Error amplifier output
Track Cross/Shock detector input
Non inverting input of track servo amplifier
Track Gain 2 - switch: controls the gain of the track servo amplifier
Inverting input of side servo amplifier
Output of track servo amplifier
Non inverting input of track servo amplifier
Inverting input of side servo amplifier
Output of slide servo amplifier
Pin for connection of DETection FILter capacitor of ADJUST LOGIC
Reference Voltage output Vcc/2 of internal BIAS-generator
Ground connection pin (negative supply)
Serial interface Microprocessor Latch control/DIScharge control for adjustment
Serial interface Jump control line/Signal Generator input line for adjustment
Serial interface Clock input line
Serial interface Data input line
Serial interface Data output line
Pin for connection of Low Pass Filter capacitor of ADJUST LOGIC
Reference current input
Positive supply connection pin (4V - 5.5V)
Output of focus servo amplifier
Inverting input of focus serco amplifier
Gain control pin of focus error amplifier
Inverting input of focus error amplifier
Signal generator output to focus servo, sends 1700Hz for adjustment procedure
Charge capacitor for Focus Search triangle-generator
Non inverting input of Automatic Laser Power amplifier
Inverting input of Automatic Laser Power Control amplifier
Output of Automatic Laser Power Control amplifier
Connection pin for capacitor of Mirror detector
Output of HF amplifier
Inverting input of HF amplifier
Sum output of amplified A, B and C input (central photo diode signal input)
to external ac-coupling capacitor
Description
+supply for signal processor
Emphasis flag output
Frame synchronize output
Low disc rotation detect output
Subcode sync signal detection
Subcode Q CRC check flag output
Interrupt signal to read out subcode Q data
Data line
System reset
Clock input
Latch clock input
Mode setting inputs (0,1,2)
+supply for data slicer and VCO
Current reference
HF signal detect
PLL loop filter
HF signal input
Output from slice level control
Ground
8,4672MHz clock output
4,2336MHz clock output
Error monitor output 2
Error monitor output 1
Crystal oscillator input
Crystal oscillator output
Output of digital interface
Serial data output to DAC
Serial data output to Dual DAC
Crystal selector input. H=8MHz, L=16MHz
Data shift clock
Word clock
Left/Right clock
Left/Right clock
Disc motor driving (Pulse Width Modulation) output 1
Disc motor driving (Pulse Width Modulation) output 2
Digital system ground
PCS 99 199