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ADJUSTMENT (TUNER / FRONT)
< 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 and check that the test point is
less than 8.0V. Then set to AM 530kHz and check that
the test point is more than 0.6V.
3. AM Tracking Adjustment
Settings : Test point :
TP8 (Rch), TP9 (Lch)
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 :
TP8 (Rch), TP9 (Lch)
Adjustment location :
L802 .................................................... 450kHz
5. FM VT Adjustment
Settings : Test point :
TP1 (VT)
Adjustment location : L907
Method : Set to FM 108.0MHz and adjust L907 so that
the test point becomes 7.0V ± 0.05V. Then set
to FM 87.5MHz and check that the test point is
more than 0.5V.
6. FM Tracking Adjustment
Settings : Test point :
TP8 (Rch), TP9 (Lch)
Adjustment location : L904
Method : Set to FM 98.0MHz and adjust L904 so that the
waveform at the test point becomes maximum with
minimum distortion.
7. DC Balance / Mono Distortion Adjustment
Settings : Test point :
TP3, TP4 (DC balance)
TP8, TP9 (Distortion)
Adjustment location : L801
Input level :
60dBµV
Method : Set to FM 98.0MHz and adjust L801 so that the
voltage between TP3 and TP4 becomes 0V ± 0.5V
with distortion less than 1.3%.
8. Output Level Check
<AM>
Settings : Test point :
TP8 (Rch), TP9 (Lch)
Input level :
74dBµV
Method : Set to AM 1000kHz and check that the test point is
55mV ± 3dB.
<FM>
Settings : Test point :
TP8 (Rch), TP9 (Lch)
Input level :
60dBµV
Method : Set to FM 98.0MHz and check that the test point is
270mV ± 3dB.
9. FM Separation Check
Settings : Test point :
TP8 (Rch), TP9 (Lch)
Input level :
60dBµV
Method : Set to FM 98.0MHz and check that the test point is
more than 25dB.
<FRONT SECTION >
10.
µ
-CON OSC Adjustment
Settings : Test point :
TP1 (K-SCAN), TP2 (GND)
Adjustment location : L101
Method : Insert AC plug while pressing of "ECO" key.
Connect a frequency counter across TP1 and TP2.
Then adjust L101 so that the test point becomes
78.52Hz ± 0.08Hz.
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