Circuit Alignments - Sanyo CE32W1-C Service Manual

CIRCUIT ALIGNMENTS

VIF ALIGNMENT
SETTING
DC 12.0V
AGC voltage (4.3-4.5V)
Output probe
Input probe
DC5.0V
Marker frequency
Sweep ATT
0dB=176mVrms/75
Tool A
Q134
C050
C218
X126
MAL
X127
T121
C138
AFT
C205
IC101
IF /VIDEO/COLOUR/
DEF.
X101
X127
C375
275
VR120
C371 AGC
Q809
VR371
Q808
H-CENTRE
TP-E
C104
K8H
K2L K2M
SIF ALIGNMENT
SETTING
DC 12V
AGC voltage
Output probe
Input probe
Sweep ATT
Marker Frequency
T3801
C3807
IC3801
K38H2
F2KT/KVT
K3A-pin5
IC101-pin48
IC101-pin45
(Side b)
IC101-pin7
KOC-pin8
38.9/39.5MHz
20dB
IC101-pin46
and GND
C131
KIG
MAIN Board
IC3801-pin11
IC3801-pin3
IC3801-pin1
(Side b)
IC3801-pin12
10dB
38.9/39.5MHz
SIF Board
X3801
K38H2
Adjustment
By using T121, adjust "P" to
be maximum amplitude.
Tools
10kΩ
Input probe
VIF Alignment
Adjustment
1. Adjust AGC voltage to be
"A" = 0.5Vp-p.
2. By using T3801, adjust "P"
to be equal centre line.
SIF Alignment
-15-
Waveform
0.002µF
a
75Ω b
1kΩ
Output probe Tool A: 0.01uF
Waveform
P
Marker frequency
39.5MHz --> C28WN1B
38.9MHz --> C28W1/WN1
P
0.01
"A"