Tuner Adjustments - Sanyo MCH-900F Service Manual

TUNER ADJUSTMENTS
.
Use a
plastic screw driver for adjustments.
Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.
Supply voltage
Phones impedance :
Standard output
Function switch
PARTS LOCATION
a. AM ADJUST
Adjusting
Step
Circuit
1
I
IF
i
2
Tuning
3
coverage
i-
4
Tracking
5
DC 12.0 V
32 oh!m
&5 mW (126 mV)
RADIO
f
IENT BAND SELECT SWITCH :
Connections
Input
output
Closed the output
Connect sweep
terminal by sweep generator to
generator, it
place
C2106 (H) &
to L2103.
TP202 (G)
Connect AM SG Connect VTVM to
to Test Loop speaker terminals
Connect AM SG Connect VTVM to
to Test Loop speaker terminals
6 lRepeat adjustments
455 kHz
I
Low
I
XF213
517k Hz
Low end L2104
1750 kHz
High end VCT -4
600 kHz
600 kHz L2103
1400 kHz 1400 kHz
VCT -3
VTVM
Oscilloscope
-4-
Max.
Max.
I
b. FM ADJUSTMENT BAND SELECT SWITCH : FM
FM
Dummy antenna : 75
ohm unbalance
r
Adjusting Connections
Step
Circuit
SG Frequency
Position of tuning dial Adjustment
Input output
Connect sweep Connect sweep
1 IF
generator to generator to
IC201 @ (H) C2106 (H)
10.7 MHz
Low . .-
& TP202 (G)
& TP202 (G)
2
Connect
FM SG
Tuning
Connect VTVM to
87.0
~~Z
Low end L2102
to TP201 (H) &
3
coverage
TP202 (G)
speaker terminals
109.0 MHz
High end
VCT-2
Connect FM SG
Connect VTVM to
4 Tracking
to TP201 (H) &
speaker terminals
98.0 MHz
98.0 MHz VCT- 1
TP202 (G)
5 lReDeat adjustments
VTVM
Oscilloscope
A
Max
Max.
I
-6–