HCD-GX8000, HCD-RG77 - Sony Audio Service Manual (repair manual). Page 29

View Sony HCD-GX8000 / HCD-RG77 Service Manual online

HCD-GX8000/RG77
29
29
A
MAIN
BOARD (1/4)
CN201
1
2
3
4
5
6
RV101
E-F BALANCE
(1 TRACK JUMP)
TP
(RFDC)
TP2
(TEO)
TP
(DVC)
680
220k
33k
TP
(FEI)
TP
(RFAC)
Q101
2SB710A-RT1
AUTOMATIC
POWER CONTROL
RF AMP,
FOCUS/TRACKING
ERROR AMP
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
TP
(FEO)
DIGITAL SERVO PROCESSOR
DIGITAL SIGNAL PROCESSOR,
DIGITAL FILTER,
D/A CONVERTER
Q102
2SD1664-T100-QR
+3.3V REGULATOR
DSP+5V (SW)
D-OUT
DSP-GND
L-CH
RF-GND
R-CH
RF+5V (SW)
X-RST
CD-DATA
CD-CLK
LD-ON
SQ-DATA
SQ-CLK
M-GND
M+7V (UNSW)
X-LAT
7-7.
SCHEMATIC  DIAGRAM  – BD Board –
 See page 28 for Waveforms.
 See page 48 for IC Block Diagrams.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD PLAY
The components identified by mark 
0
 or dotted
line with mark 
0
 are critical for safety.
Replace only with part number specified.
(Page
34)
HCD-GX8000/RG77
30
30
MAIN BOARD (1/4)
CN202
B
0.2
3.3
IC711
SG-264
DISC TRAY
STATUS SENSOR
S711
OPTICAL PICK-UP
UP/DOWN DETECT
C712
0.1
D+3.3V
D. GND
D+3.3V
D. GND
TURN
MOTOR
DRIVER
D+3.3V
D. GND
(LOAD IN)
(LOAD OUT)
S701
DISC TRAY
OPEN/CLOSE DETECT
OPEN
CLOSE
14
(14)
14
(14)
14
(14)
C712
1
4
OPTICAL PICK-UP
UP/DOWN DETECT
CN202
B
IC711
IC701
S701
DISC TRAY
OPEN/CLOSE DETECT
M721
(TURN)
7-8.
PRINTED  WIRING  BOARDS  – DRIVER/MOTOR/SENSOR (CD) Boards –
 See page 27 for Circuit Boards Location.
7-9.
SCHEMATIC  DIAGRAM  – DRIVER/MOTOR/SENSOR (CD) Boards –
 See page 48 for IC Block Diagram.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : CD PLAY
(Page 33)
(Page 34)
HCD-GX8000/RG77
31
31
7-10. PRINTED  WIRING  BOARDS  – SW/HEAD (A)/HEAD (B) Boards –
 See page 27 for Circuit Boards Location.
PM901
(DECK A)
PM902
(DECK B)
1
4
R
CN304
IC1001
(DECK A PLAY)
IC1002
(DECK B HALF)
(DECK B REC)
NO303
NO302
A
B
C
D
E
F
1
2
3
4
5
6
7
8
9
10
11
12
S
C
HPRE901
(REC/PB/ERASE HEAD)
(DECK B)
HP901
(PB HEAD)
(DECK A)
DECK A
HALF
M901
(CAPSTAN)
M
(DECK A REC)
(DECK B PLAY)
(Page 33)
(Page 33)
(Page 33)
• Semiconductor
Location
Ref. No.
Location
D1001
B-4
D1002
B-10
IC1001
B-2
IC1002
B-10
Q1001
B-3
HCD-GX8000/RG77
32
32
C
MAIN BOARD (3/4)
CN304
[3.3]
[3.3]
[
] {2.9}
<<2.9>>
[1.5]
{
} <<
>>
(CAPSTAN)
CAPSTAN MOTOR
CONTROL SWITCH
TAPE SPEED
(NORMAL)
TAPE SPEED
(HIGH)
ROTATION
DETECT
SENSOR (DECK A)
ROTATION
DETECT
SENSOR (DECK B)
+3.3V
+3.3V
CAPM
CAPM+
CAPMH/L
ATRGM+
TRGMGND
BTRGM+
S1001
(DECK A PLAY)
S1002
(DECK B PLAY)
S1003
(DECK A HALF)
S1005
(DECK A REC)
S1006
(DECK B HALF)
S1009
(DECK B REC)
C1001
33
10V
PM902
(DECK B)
PM901
(DECK A)
+3.3V
+3.3V
7-11. SCHEMATIC  DIAGRAM  – SW Board –
• Voltages are dc with respect to ground under no-signal
conditions.
[
] : TAPE PLAY (DECK A)
{
 } : TAPE PLAY (DECK B)
〈〈
 
〉〉
: REC
: Impossible to measure
(Page 36)

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