Tuner Adjustment; Mode : Tuner - Aiwa TV-F2000 Service Manual

Tuner Adjustment

If adjustment elements were replaced for repair, conduct the following set of adjustments. And then, further adjustments should be conducted on the
Adjustment Menu Screen.
If this set of adjustments was not completed, no further adjustments on the Adjustment Menu Screen can be conducted.
The elements whose circuit condition will be altered depending on repair.
• VCO coil
• SIF coil
6-1. VCO ADJUSTMENT VCO (PIF) Adjustment / Video Transfer Frequency Free-Running Adjustment
Input Signal : RF-Color Bar
Input Level : 90dBµ V
BROADCAST CH/fc=45.75MHz

MODE : TUNER

Test Point : IN-PUT / TU101-11PIN IF
OUT-PUT / IC301-44PIN AFT
Measuring Location : L205/P-IF
Measuring Instrument : Oscilloscope / Pattern generator / reader : LCG401
1. Connect the oscilloscope to IC301-44PIN.
2. Enter the specific level of RF signal to TU101-11PIN, and adjust L205 so that the voltage of IC301-44PIN will be 2.8±0.2VDC.
6-2. SIF ADJUSTMENT Audio IF Variation Adjustment
Input Signal : AM/FM-SG RF OUT/4.5MHz-SIF
MOD OFF
90dB µV
• The simple way to make adjustment is to receive a normal broadcasting.
MODE : TUNER
Test Point : IN-PUT/IC301-52PIN SIF
OUT-PUT/IC301-54PIN FM DET
Measuring Location : L201/S-IF
Measuring Instrument :Oscilloscope
1. Connect the oscilloscope to IC301-54PIN.
2. Enter the specific signal to IC301-52PIN, and adjust L201 so that the voltage
of IC301-54PIN will be 4.5 ± 0.2VDC.
Am/FM-Signal Generator
4.5V
– 21 –
Fig.6-1.