Sylvania 6842THG, Service Manual

Page: 44 / 123

1-9-5 L0700BLP
Main Power Supply Block Diagram
2A 250V
2A 250V
T
O
SUB PO
WER
SUPPL
Y
BLOCK DIA
GRAM
(CN2002)
F2200 2A/250V
F2400 2A/250V
HOT CIRCUIT. BE CAREFUL.
COLD
T2200
IC2250
IC2202 IC2201 IC2301 IC2300 IC2101 IC2403 IC2401
PO
WER
TRANSFORMER
FEEDBA
CK
FEEDBA
CK
FEEDBA
CK
ISOLA
T
O
R
ISOLA
T
O
R
ISOLA
T
O
R
ISOLA
T
O
R
T2300
PO
WER
TRANSFORMER
T2400
PO
WER
TRANSFORMER
SHUNT REG.
HO
T
PO
WER SUPPL
Y CB
A
CN2100
4
A
C120V
1
A
C120V
1
Vsus
2
Vsus
CN8006
IC2100
IC2200
IC2400
IC2501
+5V
PDM501 PLASMA DISPLA
Y
MODULE
IC2500 (PO
WER MICR
OCONTR
OLLER)
T
O
SUB PO
WER
SUPPL
Y
BLOCK DIA
GRAM
(CN2001)
CN2101
1
A
C-DET
2
A
C-DET
3
P-ON+16V
BRIDGE RECTIFIER
PO
WER
F
A
CT
OR
CORRECTION
D2101
Q2103, Q2104
SB-ON SUS-ON ADD-ON FPC-ON
ERR
OR
X IN
X OUT
RESET
RESET
4MHz OSC
X2500
D2506
Q2101, Q2102
DRIVE
Q2105, Q2106, Q2108
SWITCHING
16
6 2
10 11
17 20 24 18 19 30
2
9
10 12
6
ERR
OR
VR2250
Vsus ADJ
.
VR2850 VE ADJ
.
7
VSCAN
9
DC+15V
5
VSET
1
Vsus
2
Vsus
CN8007
5V
E
8
DC+15V
5
V
ADD
3
D+5V
CN8005
5
A
C-DET
4
PS-SOS
3
VSB+5V
1
PS-ON
CN8003
2
F
AN-CONT
1
DC+15V
CN2501
FA
N
9
VS-ON
CN8002
Q2503
8
A
C-DET
7
RELA
Y
5
D+5V
2
D+3.3V
1
D+3.3V
IC2350
SHUNT REG.
IC2853
SHUNT REG.
IC2450
SHUNT REG.
3 1
7 2
SW +5V
+15V REG.
IC2451
Q2850 - Q2855
Q2453,Q2454
Q2451,Q2452
SW +5V
Q2504,Q2505
SW+18V
SWITCH
SW CTL
Q2400, Q2401, Q2402
Q2200
SWITCHING CONTR
OL
Q2301
Q2302
Q2300
SB-ON2 A
C-DET
PS-ON
31
SUS-MONIT
OR
25
ADR-MONIT
OR
T
O
SUB
PO
WER SUPPL
Y
BLOCK DIA
GRAM
(CN708)
22
A
C-DET
32
VS-ON-MONIT
OR
23
PS-SOS
IC2601 IC2600 FEEDBA
CK
ISOLA
T
O
R
T2600
PO
WER
TRANSFORMER
8 5 6 4 8 6 2
15 16
7 9
14
7
10
1 3
12
IC2102
ISOLA
T
O
R
SWITCHING CONTR
OL
WF9
TP2100
HOT-GND
WF16
WF12
WF13
WF10
WF11
F
AN-CONT
15
Q2502
8 9
VE REG.
VR2350
V
ADD ADJ
.
IC2651
SHUNT REG.
VR2650
V
ADD ADJ
.
VR2750
VSET ADJ
.
IC2754
SHUNT REG.
Q2750 - Q2755
VSET REG.
+3.3V REG.
SW
-CTL
IC2454
SWITCH
SW CTL
Q2502
Q2600
Q2601
4
TP2400
DC+15V
TP2450
GND
TP2650
GND
CAUTION ! Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F2200, F2400) is blown , check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply. Otherwise it may cause some components in the power supply circuit to fail.
For continued protection against risk of fire, replace only with same type 2A, 250V fuse.
CAUTION ! : ATTENTION :
Utiliser un fusible de rechange de m
ê
me type de 2A, 250V.
2A 250V
NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal.