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ADJUSTMENT <TUNER, MAIN SECTION>
TUNER C.B
3
4
1
TP6
6
(LCH)
(GND)
(RCH)
7
L981
3
FFE801
1. Clock Frequency Check
Settings : • Test point : TP2 (CLK)
Method :
Set to MW 1602kHz and check that the test point is
2052kHz ± 45Hz.
2. MW VT Check
Settings : • Test point : TP1 (VT)
Method :
Set to MW 1602kHz and check that the test point is
less than 8.0V. Then set to MW 531kHz and check
that the test point is more than 0.6V.
3. MW Tracking Adjustment
Settings : • Test point : TP6 (Lch), TP7 (Rch)
• Adjustment location : L981 (1/3)
Method :
Set to MW 999kHz and adjust L981 (1/3) so that the
test point becomes maximum.
4. AM IF Adjustment
Settings : • Test point : TP6 (Lch), TP7 (Rch)
• Adjustment location :
L772 .................................................... 450kHz
CN701
TP7
TP3(DC)
TP4(DC)
TP2(CLK)
IC771
1
L771
L772
TP1(VT)
2
4
5
1
4
MAIN C.B
CN902
CN903
7
CNA201
CN091
7
5. FM VT Check
Settings : • Test point : TP1 (VT)
Method :
Set to FM 108.0MHz and check that the test point is
less than 8.0V. Then set to FM 87.5 MHz and check
that the test point is more than 0.5V.
6. FM Tracking Check
Settings : • Test point : TP6 (Lch), TP7 (Rch)
Method :
Set to FM 98.0MHz and check that the test point is
less than 13dBµV.
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3,TP4 (DC balance)
• Adjustment location : L771
• Input level : 60dBµV
Method :
Set to FM 98.0MHz and adjust L771 so that the
voltage between TP3 and TP4 becomes 0V ± 0.04V.
Next, check that the distortion is less than 1.3%.
8. MICON OSC Adjustment
Settings : • Test point : TP1
• Adjustment location : L101
Method :
Insert AC plug with pressing TUNER function key.
Adjust L101 so that frequency across the test point is
97.258 ± 0.098 Hz (10.292 ~ 10.272 ms)
-49-
CN905
CNA002
IC201
GND
IC101
L101
TP1
8
8
TP6 (Lch), TP7 (Rch) (Distortion)
CN001
CN901
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