Circuit Alignment - Sanyo CE25DN3-B 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
Trap alignment
(Only required for UK model)
SETTING
DC 15.5V
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
C644 +
By using T141, adjust "P" to
IC201-pin48
be maximum amplitude.
IC201-pin45
(Side b)
IC201-pin7
39.5MHz
20dB
C644 +
By using T101, adjust "A" to
Tuner IF
be minimum amplitude.
(Side a)
Q101-C
41.5MHz
11dB
IC3801-pin9
1. By using T3801, adjust the
IC3801-pin13 VCO oscillation to be "P".
IC3801-pin5
(Side b)
IC3801-pin17
10dB
39.5MHz
IC3801-pin6
and ground
0.002µF
a
75Ω b
1kΩ
Output probe
Adjustment
Adjustment
Adjustment
SIF BOARD
IC3811
K38H2
-8-
Waveform
P
Waveform
C
P
A
Waveform
P
T3801
IC3801
K38H1
EB4 MKII chassis