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ADJUSTMENT <TUNER / FRONT>
QQ
< TUNER SECTION >
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1. Clock Frequency Check
Settings : • Test point :
Method : Set to AM 1710kHz and check that the test point is
2160kHz ± 45Hz.
2. AM VT Check
Settings : • Test point :
Method : Set to AM 1710kHz and check that the test point is
less than 8.5V. Then set to AM 530kHz and check
that the test point is more than 0.6V.
3. AM Tracking Adjustment
Settings : • Test point :
• Adjustment location :L951 (1/3)
Method : Set to AM 1000kHz and adjust L951 (1/3) so that the
test point becomes maximum.
4. AM IF Adjustment
Settings : • Test point :
• Adjustment location :
L802 .................................................... 450kHz
5. FM VT Check
Settings : • Test point :
Method : Set to FM 87.5MHz check that the test point is more
than 0.5V. Then set to FM 108.0MHz and check that
the test point is less than 8.0V.
6. FM Tracking Check
Settings : • Test point :
Method : Set to FM 98.0MHz and check that the test point
is less than 9dBµV.
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7. DC Balance / Mono Distortion Adjustment
Settings : • Test point :
• Adjustment location :L801
• Input level :
Method : Set to FM 98.0MHz and adjust L801 so that the
voltage between TP5 and TP6 becomes 0V ± 0.04V
with minimum distortion.
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TP2 (CLK)
TP1 (VT)
TP8 (Lch), TP9 (Rch)
TP8 (Lch), TP9 (Rch)
TP1 (VT)
TP8 (Lch), TP9 (Rch)
TP5, TP6 (DC Balance)
TP8 (Lch), TP9 (Rch)
(Mono Distortion)
60dBµV
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8
8. Output Level Check
<AM>
Settings : • Test point :
• Input level :
Method : Set to AM 1000kHz and check that the test point is
200mV ± 3dB.
<FM>
Settings : • Test point :
• Input level :
Method : Set to FM 98.0MHz and check that the test point is
600mV ± 3dB.
9. FM Separation Check
Settings : • Test point :
• Input level :
Method : Set to FM 98.0MHz and check that the separation
is more than 25dB.
< FRONT SECTION >
1. µ-CON OSC Adjustment
Settings : • Test point :
• Adjustment location :L151
Method : Insert AC plug while pressing of "POWER" key and
"TUNER" function key.
Connect a frequency counter across TP5 and TP6.
Then adjust L151 so that the test point becomes
97.26Hz ± 0.097Hz.
[ Manual Reset ]
Make up for RESET after adjustment.
Q Q
3
6 7
1 3
1 5
* Reset is to press "POWER" key while pressing of
"CLEAR (STOP)" key.
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– 37 –
9 4
2 8
TP8 (Lch), TP9 (Rch)
74 dBµV
TP8 (Lch), TP9 (Rch)
60dBµV
TP8 (Lch), TP9 (Rch)
60dBµV
TP5 (KEY-SCAN)
TP6 (GND)
0 5
8
2 9
9 4
2 8
m
9 9
9 9
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