JVC CA-PCX290, Service Manual

Page: 13 / 83

9
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Tuner Section
Item Measuring
Condition
Check and adjustment procedure Standard value Adjusting part
AM IF
adjustment
Signal input:
Loop ANTENNA
Signal output:
IC101 PIN (16)
1. Set the intermediate frequency sweep generator to
AM 450 kHz.
2. Adjust the T101 for maximum and center output
•
T101
See Fig 3-2
AM tracking
adjustment
Signal input:
Loop antenna
PHONES (with 32
ohm Load)
1.Set the TUNER at 530 KHz adjust L104 until the
test pin of R107
voltage at 1.5 V
±
0.05V.
2. Set the TUNER at 1710 KHz, Check the pin of
R107 Voltage at 7.5V
±
0.5V.
3. Set the TUNER and S/G at 610KHz, adjust L103
for maximum output.
4. Set the TUNER and S/G at 1400KHz, adjust TC102
for maximum output.
5. Repeat the above steps 3 and 4.
•
L104
•
L103
•
TC102
See Fig 3-2
FM tracking
adjustment
Signal input:
Antenna
Signal output:
IC101 PIN (16)
1.Set the TUNER at 87.5MHz adjust L102 until the
test pin of R105 voltage at 2.3 V
±
0.05V.
2.Set the TUNER at 108MHz, Check the pin of
R105 Voltage at 7.5V
±
1V.
3. Set the TUNER and S/G at 90.1MHz, adjust L101
for maximum output.
4.Set the TUNER and S/G at 106.1MHz, adjust
TC101 for maximum output.
5.Repeat the above steps 3 and 4.
•
L102
•
L101
•
TC101
See Fig 3-2
PC - X290