Tuner Adjustments (All Except Z130L) - Sanyo CWM-240 Service Manual

TUNER ADJUSTMENTS (All except Z130L)

Use a plastic screw driver for adjustments.
Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.
Set of unit
Supply voltage : DC 12.0V
Speaker impedance : 8 ohms
Standard output : 50 mW
Function switch : RADIO
a. AM Adjustment
Adjusting
Step
Circuit
Closed the output
terminal by sweep
1 IF
generator,it place
2 Tuning
Connect AM SG to
3 coverage
4 Connect AM SG to
Tracking
5
b. FM Adjustment
Adjusting
Step
Circuit
1 IF
IC101(1)pin (H) &
2 Tuning Connect FM SG to
3 coverage JP105(H) & D102(E)
4
Connect FM SG to
Tracking
5
JP105(H) & D102(E)
248-130801-124
Band switch : MW
Connections
Input Output
Connect sweep
generator to (19)
to MW ANT IC101(H) 0and C114(E)
Connect VTVM to
test loop speaker terminals.
Connect VTVM to
speaker terminals.
test loop
Band switch : FM
Connections
Input Output
Connect sweep Connect VTVM to
generator to
generator to (19)
IC101(2)pin (E) IC101(H) and C104(E)
Connect VTVM to
speaker terminals.
Connect VTVM to
speaker terminals.
AM COIL
SW102
SW101
T101
PUC
C3
C2
L104
T103
IC101
T104
T105
SG Position of
Frequency Tuning dial
465 KHz Low
515 KHz Low end
1640 KHz High end
600 KHz 600 KHz
1400 KHz 1400 KHz
FM Dummy antenna : 75 ohms unbalance
SG Position of
Frequency Tuning dial
10.7 MHz Low
87.30 MHz Low end
108.75 MHz High end
90.0 MHz 90.0 MHz
106.0 KMz 106.0 MHz
- 2 -
C4
C1
L105
Adjustment
Oscilloscope
T104
T101
C3
MW AMT
C4
Adjustment
Oscilloscope
T103
T105
L105
C1
L104
C2
VTVM
Max.
Max.
VTVM
Max.
Max.