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Sony XM-GTX6020 Service Manual page 10

Stereo power amplifier
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XM-GTX6020/GTX6022
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For Printed Wiring Boards.
Note:
• X : Parts extracted from the component side.
: Pattern from the side which enables seeing.
For Schematic Diagrams.
Note:
• All capacitors are in μF unless otherwise noted. (p: pF) 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
specifi ed.
Note: The components identifi ed by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specifi ed.
• A : B+ Line.
• B : B– Line.
• H : Adjustment for repair.
• Power voltage is dc 14.4 V and fed with regulated dc
power supply from +12 V and REM terminals.
• Voltages are dc with respect to ground under no-signal
conditions.
• Voltages are taken with VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: AUDIO
XM-GTX6020/GTX6022
• Note for Replacement of the Transistors
The transistors Q110, 111, 210 and 211 have two different ranks:
P rank and Y rank.
The rank of these transistors need to be selected properly accord-
ing to each channel. When replacing any one of these transistors,
check its rank and replace with the appropriate transistor of the
same rank.
Rank
Q110, 210
Q111, 211
2SC5100-P
2SA1908-P
P
(Part No. 8-729-024-79)
(Part No. 8-872-024-76)
2SC5100-Y
2SA1908-Y
Y
(Part No. 8-729-024-80)
(Part No. 8-872-024-77)
DISCRIMINATION:
A1908: 2SA1908
C5100: 2SC5100
P: RANK P
Y: RANK Y
• Note for Replacement of the IC901
Two different types of parts are used for the IC901 of this set.
Check the product code printed on the top face of the IC when
replacing the IC901.
TYPE A : TL594I
TYPE B : C494GS
Ref. No.
TYPE A
TYPE B
IC901
TL594INSR
μPC494GS-E2-A
R913
24 kΩ
22 kΩ
• Waveform
1
IC901 5 (CT)
3 Vp-p
20 sec
1 V/DIV, 10 sec/DIV
• IC Block Diagram
IC901 TL594INSR (TYPE A)
IC901 μPC494GS-E2-A (TYPE B)
16
15
14
13
12
11
10
9
REF 5V
ERROR
Q1
Q2
OSC
ERROR
0.1V
1
2
3
4
5
6
7 8
10
10

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