< TUNER SECTION >
1. Clock Adjustment
Settings :
• Test point :
TP2 (CLK)
• Adjustment location : L901
Method :
Set to AM 531 kHz and adjust L901 so that the test
point becomes 1.0 MHz ± 1 kHz.
2. AM VT Check
Settings :
• Test point :
TP1 (VT)
Method :
Set to AM 531 kHz and check that the test point is
1.0 V ± 0.5 V. Then set to AM 1602 kHz and check
that the test point is 6.5 V ± 1.0 V.
3. AM Tracking Adjustment
Settings :
• Test point :
TP8 (Lch), TP9 (Rch)
• Adjustment location :
ANT801 ....................................... 603 kHz
TC801 ........................................ 1404 kHz
*Repeat this adjustment a few times until the wave
shape has the maximum amplitude.
4. AM IF Adjustment
Settings :
• Test point :
TP8 (Lch), TP9 (Rch)
• Adjustment location :
L806 ............................................ 450 kHz
5. FM VT Adjustment.
Settings :
• Test point :
TP1 (VT)
• Adjustment location : L805
Method :
Set to FM 108.0 MHz and adjust L805 so that the
test point bcomes 6.8 V ± 0.2 V. Then set to FM
87.5 MHz and check that the test point is 1.5 V ±1.0 V.
6. FM Tracking Adjustment
Settings :
• Test point :
TP3 (FM IF)
• Adjustment location : L804
Method :
Set to FM 108.0 MHz and adjust L804 so that the test
point is maximum and distortion is minimum.
7. FM Tracking Check
Settings :
• Test point :
PHONES-OUT (volume max)
Method :
Set to 87.5 MHz, 108.0 MHz and check that the test
point is 10 dB ± 6 dB.
8. FM Separation Check
Settings :
• Test point :
PHONES-OUT (volume max)
• Input level :
60 dB, 1 kHz
Method :
Set to FM 98.0 MHz and check that the separation is
more than 17 dB.
9. Mono Distortion Check
Settings :
• Test point :
PHONES-OUT (volume max)
• Input level :
60 dB, 1 kHz
Method :
Set to FM 98.0 MHz and check that the mono
distortion is less than 3.0 %.
10. Output level check
<AM>
Settings:
•Test point :
TP8 (Lch), TP9 (Rch)
• Input level :
74 dB
Method :
Set to AM 1000 kHz and check that the test point
is 100 mV ± 15 mV .
<FM>
Settings:
•Test point :
TP8 (Lch), TP9 (Rch)
• Input level :
60 dB
Method :
Set to FM 98.0 MHz and check that the test point
is 270 mV ± 15 mV.
– 23 –
ADJUSTMENT
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
