Tuner Adjustment - Sanyo DC-MCR50 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
Function switch
a. Parts Location
b. AM Adjustment
Step Adjusting Tuning
circuit Frequency Measurement
1 IF 999 kHz
(450 KHz)
2 Tuning 522 KHz
3 Coverage 1611 kHz
4 603 kHz
5 Tracking 1404 kHz
b. FM Adjustment
Ste p Adjusting Tuning
circuit Frequency
1 IF 98.0 MHz
(10.70 MHz)
2 Tuning 87.5 MHz
Coverage
3 108 MHz
4 90.0 MHz
5 Tracking 106.0 MHz
: DC 12.0V
: 32 ohms
: RADIO
BAND SELECT SWITCH: AM.
Input Connection
Input
AM Sweep Loop ANT
Genertor
AM Signal
Loop ANT
Generator
BAND SELECT SWITCH: FM.
Input Connection
Measurement Input
FM Sweep IC101(5)H
Genertor IC101(6) E
FM Signal C110 (H)
Generator
IC101(6)E
Output Connection
Measurement
Output
IC101PIN19(H)
VTVM
IC101PIN6(E)
Oscilloscope
Digital C131(H),
Voltmeter C131(E)
VTVM C146TU(L)
Oscilloscope
IC101 pin6(E)
FM Dummy Antenna : 75 ohm unbalance
Output Connection
Measurement
Output
VTVM IC101PIN19(H)
Oscilloscope IC101PIN6(E)
Digital C105(H)
Voltmeter C105(E)
VTVM C146TU(L)
Oscilloscope
IC101 pin6(E)
- 2 -
Adjustment VTVM Oscilloscope
Parts OR VT. VOLT.
T102
T101 1.50V+/- 0.05 V
Confirm 7.8V+/-0.8 V
L106
Maximum
TC101
Adjustment
VTVM Oscilloscope
Parts
(Non-adjustment)
L103 2.0V+/- 0.2V
Confirm6,5V+/- 0.8V
L102
Maximum
TC102