Circuit Alignment - Sanyo CE21DN4-F Service Manual

CIRCUIT ALIGNMENT

VIF alignment (DETECTOR ADJ.1)
SETTING
DC 15.0V
AGC voltage (4.3-4.5V)
Output probe (Side b)
Input probe
DC5V
JIG-A
Sweep ATT
0dB=176mVrms/75
Scope
System
VIF alignment (DETECTOR ADJ.2)
SETTING
DC 15.0V
AGC voltage (4.3-4.5V)
Output probe (Side b)
Input probe
DC5V
JIG-A
Sweep ATT
0dB=176mVrms/75
Scope
System
SIF alignment (FM Detector-1)
SETTING
DC 12V
AGC voltage (DC5V)
Output probe (Side a)
Input probe
Jig-A
Sweep ATT
Scope
Marker Frequency
F7KLV
Adjustment
IC651-pin1
By using T141,
IC201-pin48
adjust "P" to be
IC201-pin45
maximum
IC201-pin7
amplitude.
Q681-E
IC201-pin46
20dB
100mV/div
L
Adjustment
IC651-pin1
By using VC141,
IC201-pin48
adjust "P" to be
IC201-pin45
maximum
IC201-pin7
amplitude.
Q681-E
IC201-pin46
20dB
100mV/div
L'
K38H2-pin3 By using T3853, adjust "P" to
IC3852-pin13 be 38.9MHz ±100KHz.
IC3852-pin5
IC3852-pin17
IC3852-pin6
10dB
100mV/div
38.9MHz
103P
0.01uF
Jig-A
Input probe
Waveform
Waveform
,
P
Adjustment
-8-
10kΩ
0.002µF
75Ω
Output probe
Notes
How to select SYSTEM L or
P
L'.
1. Before power on, connect
IC801-pin11 to GND.
2. Select L or L' acording to
the table
Q832- C GND Short Open
Notes
How to select SYSTEM L or
L'.
1. Before power on, connect
IC801-pin11 to GND.
2. Select L or L' acording to
the table
Q832- C GND Short Open
Waveform
a
b
1kΩ
L L'
L L'
P