Tuner Adjustments - Sanyo DTA-100PA 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.
• Set of unit
Supply voltage : DC 12V
Speaker : 8 ohms
Standard output : 50 mW
Function switch : RADIO
a.PARTS LOCATION
b. AM ADJUSTMENT
Adjusting Equipment
Circuit Connection
IF
AM Connect Digital Voltmeter to
Collector of Q404
band
Tracking Connect VTVM and 4 ohm
load across speaker terminals.
Signal Generator coupled by
a loop antenna.
Output level must be below
reference output.
c. FM ADJUSTMENT
Adjusting Equipment
Circuit Connection
FM Connect Digital Voltmeter to
Collector of Q404
band
Tracking Connect VTVM and 4 ohm
load across speaker terminals.
Signal Generator to ANT.
Output level must be below
reference output.
Band switch : AM
S t e p G e n .
f r e q .
1 450kHz
2 522kHz
3 1611kHz
4 603kHz
5 1404kHz
Repeat steps 4 and 5 obtain Maximum output.
6
Band switch : FM
S t e p G e n .
f r e q .
1 87.5MHz
2 107.9MHz
3 90.1MHz
4 106.1MHz
5 Repeat steps 3 and 4 obtain Maximum output.
- 2 -
Set Radio To obtain MAX. output adjust.
freq. To Measurement
1611kHz T702
522kHz T701 (Adjust the voltage to 1.42 +/- 0.2V)
1611kHz Confirm the voltage to 7.05 +/- 0.3V
603kHz L703 ant. Coil.
1404kHz TC702 ANT-TRIMMER.
Set Radio To obtain MAX. output adjust.
freq. To Measurement
87.5MHz T701 (Adjust the voltage to 4 +/-0.2V)
107.9MHz Confirm the voltage to 8.1 +/- 0.2V
90.1MHz L702(FM RF coil)
106.1MHz TC701 ANT-TRIMMER.