Circuit Alignment; Vif Alignment; Main Board - Sanyo CE28DF1-C Service Manual

CIRCUIT ALIGNMENT

VIF ALIGNMENT

10kΩ
Input probe
DC 15V
DC 5V
AGC voltage (4.3-4.5V)
Output probe
Input probe
Tool-A
System SW
Sweep ATT
Adjustment
VIF waveform

MAIN BOARD

VR351
+B ADJ.
r
er
Q702
Q701
Q203
IC352
IC351
Q205
Q434
R451
SIZE
IC451
V-Output
Q431
Q820
802 K801
K801
CART Terminal-2 SCART Terminal-1
21P-SCART TERMINAL
0.002µF
a
75Ω b
1kΩ
Output probe
DETECTOR
ADJUSTMENT - 1
IC351-pin 1
Q381-Emitter
IC101-pin 48
IC101-pin 45
(Side b)
IC101-pin7
IC101-pin46
BG
20
By using T121, adjust
"P" to be maximum
amplitude.
Q128 Q741
T121
Q124
Q122
VC141
KU
IC101
Q202
IF/CHROMA/VIDEO/DEF.
TP-E
IC270 IC280
VR401
H-CENTRE
Q101
Q401
Q852 Q862 Q861
IC801
Q853
Q851
Q800
Q855
Q854
Q856
Q857
0.01uF
Tool-A
DETECTOR
ADJUSTMENT - 2
IC351-pin 1
Q381-Emitter
IC101-pin 48
IC101-pin 45
(Side b)
IC101-pin7
IC101-pin46
L'
20
By using VC141,
adjust "P" to be
maximum amplitude.
P
P
TP-D
Detector adjustment - 1
VR120
AGC
IC353
Detector adjustment - 2
A101
TP-A
TUNER
IC851
-8-
Note:
How to select SYSTEM
L or L'
1. Before switching on
connect IC701 pin 11
to ground.
2. Select L or L'
according to the table.
L
IC701- GND SHORT
41
Q761- B GND SHORT
L'
SHORT
OPEN