HCD-GX20, MHC-GX20 - Sony Audio Service Manual (repair manual). Page 19

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19
HCD-GX20
SECTION 5
DIAGRAMS

Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
Ω
 and 
1
/
4
 
W or less unless otherwise
specified.
•
f
: internal component.
•
C
: panel designation.
Note on Printed Wiring Boards:
• X
: parts extracted from the component side.
• b
: Pattern from the side which enables seeing.
• Indication of transistor.

Note:
The components identi-
fied by mark 
0
 or dotted
line with mark 
0
 are criti-
cal for safety.
Replace only with part
number specified.

Note:
Les composants identifiés par
une marque 
0
 sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
no mark : FM
<
 
 
> :  CD
[
] : TAPE
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
E
: PB (DECK A)
d
: PB (DECK B)
G
: REC (DECK B)
J
: CD
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
5-1. Circuit Boards Location
• Waveforms
KEYBOARD board
PANEL board
TRANS board
SUB TRANS board
VIDEO OUT board
MAIN board
POWER board
CD board 
DRIVER board
MOTOR board
SPDL board
ADDRESS SENSOR board 
REM board 
5
 
Q209 Collector
(TAPE REC mode)
2
 
IC601 
qd
 (XT2)
1
 
IC751 
rf
 (XOUT)
4
 
IC102 
ws
 (XOUT)
2 V/DIV, 100 ns/DIV
5 V/DIV, 10   s/DIV
2 V/DIV, 10   s/DIV
2 V/DIV, 20 ns/DIV
3
 
IC601 
qh
 (CF2)
2 V/DIV, 40 ns/DIV
5.2 Vp-p
5.6 Vp-p
59 ns
222 ns
30.5   s
4.9 Vp-p
100 ns
5.0 Vp-p
13.5 Vp-p
17   s
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