Circuit Alignment - Matsui 28M1 MKII 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
SETTING
DC 15.5V
Output probe
Input probe
Marker frequency
Sweep ATT
0dB=176mVrms/75
SIF alignment
SETTING
DC 12V
AGC voltage
Output probe
Input probe
Sweep ATT
Marker Frequency
I
C644 +
By using T141, adjust "P" to
IC201 -pin48
be maximum amplitude.
IC201 -pin45
(Side b)
IC201 -pin7
39.5MHz
20dB
T
C644 +
By using T101, adjust "A" to
Tuner IF
be minimum amplitude.
(Side a)
Q101-C
41.5MHz
11dB
1. Adjust AGC voltage to be
IC3801 -pin3
IC3801 -pin1
2. By using T3801, adjust "P"
(Side b)
IC3801 -pin1 2
1 OdB
38.5MHz
I
Input probe
Adjustment
Adjustment
Adjustment
"A" = 0.5Vp-p.
to be equal centre line.
-8-
Waveform
Waveform
A
Waveform
E6LM/MM