Panasonic TC-42P1F / TC-42P1 / TC-42PD1 / TC-42PD1F / TC-42P1FA / TC-42PD1FA / TC-37P1F / TC-37P1 / TC-37PD1 / TC-37PD1F Service Manual ▷ View online
- 21 -
Quick adjustment after P.C.B. exchange
When a P.C.B. is changed following P.C.B. should be re-adjusted.
Location of Lead Wiring
Changed
P.C.B.
Item
Volume
Test point
Level
P1 board
V
DA
R528
TPDA1(C1)
75V±0.5V
V
SUS
R639
TPVSUS
V
SUS
±1V
V
E
R494(P1)
TPVE
V
E
±1V
DS board
DS contrast
IIC mode
TP216
0.7 Vp-p
SC board
Vset
R6587
TPVSET
V
SET
±0.5V
Vscn
R6595
TPVSCN
80V±0.5V
SS board
Erase pulse
R6754
TPSS1
Waveform
D board
Re-confirmation of all alignment setting
H7
H17
H17
H77
H3 H11
H6
H4
D20
D21
H26
P9
P4
P23 P24 P17 P8
P7 P5
P6
P1
SS1
SS32
C32
C33
S12
S16
SS33
CLAMPER
P2
H2
B
R
G
B
R
G
B
R
G
R
G
D10
D11
D2
SC20
CLAMPER
SC22
H21
S77 S6
SC21
D6
D4
D3
CLAMPER
CLAMPER
CORE
CLAMPER
7
6
5
4
2
1
15
12
14
13
3
8
9
CORE
CORE
CORE
CORE
CORE
- 22 -
Basic Circuit Explanation
1 POWER SUPPLY CIRCUIT
1-1 Power Factor Control (PFC)
1-1-1 Basic operation of the Full wave bridge rectifier
AC voltage
AC current
AC in
+
VDC
-
VDC
Feature:
1) Power Factor
1) Power Factor
0.5 ~ 0.7
0
2) Spick AC current with high frequency component.
Power Factor control circuit
L
D
AC in
SW
+
VDC
-
ON
SWITCH
(sw)
Feature:
1) Power Factor
More than 0.9
OFF
2) Automatic Power Factor Control
by OFF period change
AC voltage
3) Lower high frequency noise.
AC in
0
Peak current
Average current
VDC
0
1-1-2
- 23 -
1-2 Activ Clamp Full Bridge (ACFB)
1-2-1 ACFB equivalent circuit
400V
Q412
Q413
T401/L411
+
-
Q414
Q415
VDC
OFF
Q412
ON
OFF
Q415
ON
OFF
Q413
ON
Q413(D)
OFF
Q414
ON
Q415(D)
l1
l2
FULL
WAVE
BRIDGE
RECTIFIER
- 24
-
2. HG BO
ARD CONTR
O
L
COMPOSITE
525I 525P 625I 625P 1035I 1080I
RGB
PC
TUNER
2
SW0
φ
IC8502
TUNER/EXTERNAL
INPUT SELECT
1
SW1
φ
φ
IC8503
H
H
H
H
L
L
L
H
L
L
L
L
PC/ COMPONENT
INPUT SELECT
9
SW2
φ
φ
φ
φ
φ
φ
NOT USE
10
SW3
VIDEO H
S-VIDEO L
S-VIDEO L
φ
φ
φ
φ
φ
φ
φ
S-VIDEO INPUT
DETCTION
S-VIDEO INPUT
DETCTION
IC8506
7
DAC0
BBE CONTROL
6
DAC1
SYNC. SW A
5
DAC2
SYNC. SW B
4
DAC3
H
H
H
L
L
IC8517
SYNC. INHIBIT
3
DAC4
IC8000
DS SUB CONTRAST
2
SW0
φ
φ
φ
1
SW1
φ
φ
φ
9
SW2
φ
φ
φ
10
SW3
φ
φ
φ
IC8507
7
DAC0
φ
φ
φ
NO USE
6
DAC1
φ
φ
φ
DETAIL
5
DAC2
φ
φ
φ
DETAIL CORING
CONTROL
4
DAC3
φ
φ
φ
DETAIL GAIN CONTROL
3
DAC4
φ
φ
φ
SHARPNESS CONTROL
2
SW0
IC8510&IC8518
DS/RGB SW
1
SW1
φ
φ
φ
IC8508
OUTLINE GAINE
CONTROL
9
SW2
L
H
IC8511
DS/RGB SW
10
SW3
φ
φ
φ
DS RESET
IC8516
7
DAC0
φ
φ
φ
BLOOMING LEVEL
CONTROL
6
DAC1
φ
φ
φ
FAN MOTOR CONTROL
5
DAC2
φ
φ
φ
DSC LIMITER
CONTROL
4
DAC3
φ
φ
φ
DSC CORING
CONTROL
3
DAC4
φ
φ
φ
NOT USE
REMARK
PORT
PIN
COMPONENT
IC8508
CONTROL DAC OUT
CONTROL DAC OUT
CONTROL DAC OUT
CONTROL DAC OUT
CONTROL DAC OUT
φ
L
H
φ
IC8509
CONTROL DAC OUT
φ
CONTROL DAC OUT
IC8508
IC8521
IC8521
IC8513
IC8521
IC8513
CONTROL DAC OUT
CONTROL DAC OUT
CONTROL DAC OUT
L
H
SYNC ON G H
CONTROL DAC OUT
BBE CONTROL DAC OUT
CONTROLLED
Y DELAY CONTROL
C DELAY CONTROL
CONTROL DAC OUT
CONTROL DAC OUT
CONTROL DAC OUT
CONTROL DAC OUT
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