– 31 –
ADJUSTMENT <TUNER / DECK / MICON>
< TUNER SECTION >
1. Clock frequency Check
Settings : • Test point : TP2 (CLK)
Method : Set to AM 1710kHz and check that the test point is
2160kHz
±
45Hz.
2. AM VT Check
Settings : • Test point : TP1 (VT)
Method : Set to AM 1710kHz, 530kHz and check that the test
point is less than 8.5V (1710kHz) and more than
0.6V (530kHz).
Settings : • Test point : TP1 (VT)
Method : Set to FM 87.5MHz, 108.0MHz and check that the test
point is more than 0.5V (87.5MHz) and less than 8.0V
(108.0MHz).
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L951(1/3) ...................................... 1000kHz
Method : Set to MW 1000kHz and adjust L951(1/3) to MAX.
5. FM Tracking Check
Settings : • Test point : TP8(Lch), TP9(Rch)
Method : Set to FM 98.0MHz and check that the test point is less
than 9dB
µ
V.
6. AM IF Adjustment
Settings : • Test point : TP8(Lch), TP9(Rch)
• Adjustment location :
L802 ................................................ 450kHz
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
TP8(Lch), TP9(Rch) (Distortion)
• Adjustment location : L801
• Input level : 60dB
µ
V
Method : Set to FM 98.0MHz and adjust L801 so that the voltage
between TP3 and TP4 becomes 0V
±
0.3V.
Next, check that the distortion is less than 1.3%.
11
A MAIN C.B
L951
FFE831
SFR351
IC801
L801
24
TP1(VT)
TP4(DC BAL)
TP9 (RCH)
GND
L802
TP2
(CLK)
(3/3) (1/3)
6
7
TP8 (LCH)
SFR352
12
3
8
6
7
9
10
12
2
IC303
TP3(DC BAL)
4
1
5
13
7
1
1
4
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