Sony XM-GTX1821 Service Manual ▷ View online
XM-GTX1821
5
SECTION 3
DISASSEMBLY
•
This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
Note: Follow the disassembly procedure in the numerical order given.
3-2. BOTTOM PLATE BLOCK
3-2. BOTTOM PLATE BLOCK
(Page
(Page
5)
3-3. MAIN BOARD BLOCK
(Page
(Page
6)
SET
3-4. MAIN
BOARD
(Page
6)
Note: Please spread a sheet under a unit
not to injure heat sink (main).
4 bottom plate block
1 three screws
(+B, TT, B-TYPE, 3
u L)
1 three screws
(+B, TT, B-TYPE, 3
u L)
2
3 two claws
– Bottom side view –
XM-GTX1821
6
3-4. MAIN BOARD
3-3. MAIN BOARD BLOCK
1 three screws
(+P, TT, B-TYPE, 3
u 8)
1 three screws
(+P, TT, B-TYPE, 3
u 8)
4 MAIN board block
After unfastening the screw,
taping with the screw inserted
facilitates the work.
taping with the screw inserted
facilitates the work.
2 screw
(+B, TT, B-TYPE, 3
u L)
1 three screws
(+P, TT, B-TYPE, 3
u 8)
3
– Bottom side view –
Note: Please spread a sheet under a unit
not to injure heat sink (main).
– Bottom side view –
3 front panel
5 MAIN board
1 two screws
(+P, TT, B-TYPE, 3
u 8)
1 two screws
(+P, TT, B-TYPE, 3
u 8)
4 heat transfer sheet
2
XM-GTX1821
7
SECTION 4
DIAGRAMS
For Schematic Diagrams.
Note:
• All capacitors are in
• All capacitors are in
μF unless otherwise noted. (p: pF) 50
WV or less are not indicated except for electrolytics and
tantalums.
tantalums.
• All resistors are in
Ω and 1/4 W or less unless otherwise
specifi ed.
•
2 : Nonfl ammable resistor.
•
C : Panel designation.
•
A : B+ Line.
•
B : B– Line.
• Power voltage is dc 14.4 V and fed with regulated dc
power supply from +12 V and REM terminals.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
• Voltages are taken with VOM (Input impedance 10 M
).
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
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F :
AUDIO
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
(In addition to this, the necessary note is printed in each block.)
For Printed Wiring Boards.
Note:
•
•
X : Parts extracted from the component side.
•
Y : Parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
(The other layers’ patterns are not indicated.)
• Indication of transistor.
C
B
These are omitted.
E
Q
C E
B
These are omitted.
B
These are omitted.
C E
Q
XM-GTX1821
8
• Waveforms
– MAIN Board –
+
–
–
DTC
1IN+
ERROR
AMPLIFIER 1
AMPLIFIER 1
PWM
COMPALATOR
COMPALATOR
UNDER
VOLTAGE
LOCKOUT
CONTROL
VOLTAGE
LOCKOUT
CONTROL
C1
1D
CTC
COMPALATOR
COMPALATOR
FEEDBACK
2IN+
2IN–
2IN–
1
3
4
0.7mA
15
16
OSCILLATOR
PULSE-STEERING
FLIP-FLOP
REF
14
1IN– 2
CT
RT
RT
OUTPUT CTRL
5
6
6
13
VCC
12
GND 7
+
–
–
ERROR
AMPLIFIER 2
AMPLIFIER 2
C1 8
E1
9
E2
10
C2
11
REFERENCE
REGURATOR
• IC Block Diagram
– MAIN Board –
IC902 TL594INSR
36.4
Ps
24 Vp-p
1
Q909 – 912 (Drain)
10 V/DIV, 20
Ps/DIV
2
IC902
5 (CT)
1 V/DIV, 5
Ps/DIV
17.5
Ps
2.2 Vp-p
Click on the first or last page to see other XM-GTX1821 service manuals if exist.