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Circuit Alignments - Sanyo C28WP1 Service Manual

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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
SIF ALIGNMENT
SETTING
DC 12V
AGC voltage
Output probe
Input probe
Sweep ATT
Marker Frequency
PILOT ALIGNMENT
SETTING
Oscilloscope
Input sound signal source
TV system
Deviation
Mode
Marker frequency
38.9MHz --> C28WP1/C28WP1B/WP1E
K3A-pin5
By using T121(T141 is shown
IC101-pin48
on top of the shield case),
IC101-pin45
adjust "P" to be maximum
(Side b)
amplitude.
IC101-pin7
KOC-pin8
38.9MHz
20dB
IC101-pin46
and GND
IC3801-pin11
1. Adjust AGC voltage to be
IC3801-pin3
"A" = 0.5Vp-p.
IC3801-pin1
2. By using T3801, adjust "P"
(Side b)
to be equal centre line.
IC3801-pin12
10dB
38.9MHz
IC3401-pin5
By using T3401, adjust
amplitude to be maximum.
System B/G
27kHz
Stereo
Tools
Input probe
Adjustment
Adjustment
Required only model C28WP1
Adjustment
10kΩ
Output probe
-22-
Waveform
P
Waveform
"A"
P
Waveform
0.002µF
a
75Ω
b
1kΩ
Tool A: 0.01uF
A
0.01
F2JE

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This manual is also suitable for:

C28wp1bC28wp1e