Circuit Alignment - Sanyo CE25DN4-C Service Manual

CIRCUIT ALIGNMENT

VIF alignment
SETTING
DC 15.5V
AGC voltage (4.3-4.5V)
Output probe
Input probe
Marker frequency
Sweep ATT
0dB=176mVrms/75
SIF alignment
SETTING
DC 12V
AGC voltage(5V DC)
Output probe
Input probe
Sweep ATT
Marker Frequency
Tool-A
0.01
Tool-A
10kΩ
Input probe
F7VVV
C644 +
By using T141, adjust "P" to
IC201-pin48
be maximum amplitude.
IC201-pin45
(Side b)
IC201-pin7
38.9MHz
20dB
IC3801-pin9
1. By using T3801, adjust the
IC3801-pin13 VCO oscillation to be "P".
IC3801-pin5
(Side b)
IC3801-pin17
10dB
38.9MHz
IC3801-pin6
and ground
0.002µF
a
75Ω b
1kΩ
Output probe
Adjustment
Adjustment
SIF BOARD
IC3811
K38H2
-8-
Waveform
P
Waveform
P
T3801
IC3801
K38H1