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

TUNER ADJUSTMENTS (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
to MW ANT
2 Tuning Connect AM SG to
3 coverage test loop
4 Connect AM SG to
Tracking
5 test loop
6 Tuning Connect AM SG to
7 coverage test loop
8 Connect AM SG to
Tracking
9 test loop
b. FM Adjustment
Adjusting
Step
Circuit
Connect sweep
generator to
1 IF
IC101(1)pin (H) &
IC101(2)pin (E)
2 Tuning
Connect FM SG to
3 coverage
JP105(H) & D102(E)
4
Connect FM SG to
Tracking
5
JP105(H) & D102(E)
LW COIL
248-130901-124
T102
T101
T104
Band switch : MW
Connections
Input Output
Connect sweep
generator to (19)
IC101(H) 0and C114(E)
Connect VTVM to
speaker terminals.
Connect VTVM to
speaker terminals.
Connect VTVM to
speaker terminals.
Connect VTVM to
speaker terminals.
Band switch : FM
Connections
Input Output
Connect VTVM to
generator to (19)
IC101(H) and C104(E)
Connect VTVM to
speaker terminals.
Connect VTVM to
speaker terminals.
MW COIL
SW102
SW101
CT102
PUC
C4
C3
CT106
C2
C1
L104
T103
L105
IC101
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
140 KHz Low end
290 KHz High end
160 KHz 600 KHz
250 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 MHz 106.0 MHz
- 3 -
VTVM
Adjustment
Oscilloscope
T104
T102
Max.
C3
MW COIL
Max.
C4
T101
Max.
CT106
LW COIL
Max.
CT105
VTVM
Adjustment
Oscilloscope
T103
T105
L105
Max.
C1
L104
Max.
C2