Sanyo MCH-900F - Compact Disc Preparation and Handling; Disc Handling and Cleaning

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–