Service manual

3-8
CS 49 117
SERVO PROCESSOR M62475FP
Pin Name Direction Description
1-3 A, B, C Diode array → Servo processor Current input ( central photo diode signal input )
4-5 E, F Diode array → Servo processor Current input ( satellite photo diode signal input )
6 SGT Servo processor → 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 track servo amplifier
15 TS out Servo processor → 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 → Motor driver Output of slide servo amplifier
19 DET.FILTER - Pin for connection of DETection FILter capacitor of
ADJUST LOGIC
20 BIAS Servo processor → external electronic Reference Voltage output Vcc/2 of internal BIAS-generator
21 GND - Ground connection pin ( negative supply )
22 MLA/DIS µP → Servo processor Serial interface Microprocessor LAtch control / DIScharge control for adjustment
23 JP1/SG µP → Servo processor Serial interface Jump control line / Signal Generator input line for adjustment
24 MCK µP → Servo processor Serial interface Clock input line
25 MSD µP → Servo processor Serial interface Data input line
26 D
out
Servo processor → µP Serial interface Data output line
27 C
LPF
- Pin for connection of Low Pass Filter capacitor for
ADJUST LOGIC
28 I
REF
- Reference current input
29 V
CC
- Positive supply connection pin ( 4V - 5.5V )
30 FS
OUT
Servo processor → Servo driver Output of focus servo amplifier
31 FS - - Inverting input of focus servo amplifier
32 FEGain - Gain control pin of focus error amplifier
33 FE - - Inverting input of focus error amplifier
34 SGF Servo processor → Focus error ampl. input Signal generator output to focus servo, sends 1300Hz for adjust. procedure
35 C
FSR
- Charge capacitor for Focus Search triangle-generator
36 ALPC + - Non inverting input of Automatic Laser Power Control amplifier
37 ALPC - - Inverting input of Automatic Laser Power Control amplifier
38 ALPC
OUT
Servo processor → Laser driver Output of Automatic Laser Power Control amplifier
39 MRC - Connection pin for capacitor of Mirror detector
40 HF Servo processor → 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
SIGNAL 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 µP → Signal processor System reset ( low level = active )
6 C423 Signal processor → µP 4.2336MHz clock output
7 C846 not connected 8.4672MHz clock output
8 XI X-Tal → Signal processor Crystal oscillator input
9 DVSS - Digital system ground
10 XO Signal processor → 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 → 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 → Motor driver Disc motor driving ( Pulse Width Modulation ) output
28 DVDD2 - Digital interface power supply 2
29 DVSS2 - Digital system ground2
30 MCK µP → Signal processor µP interface shift Clock input
31 MSD µP ↔ Signal processor µP interface Serial Data I/O line
32 MLAB µP → Signal processor µP interface Latch clock input ( internal 22k pull up resistor )
33 EXP1 → Signal processor Versatile input pin ( internal 4.7k pull up resistor )
34 EXP2 → Signal processor Versatile input pin ( internal 4.7k pull up resistor )
35 CGREF → 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 → 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 → Audio signal output (right channel) / Ext. DAC mode: Data shift clock output
40 RNEG/LRCK Signal processor → Charge pump output (right channel) / Ext. DAC mode: L/R clock output
41 IREF - Current reference
42 Anal. V
DD
- Analog System power supply
Pin-descriptions of CD ICs