ADJUSTMENT – 1 <TUNER / FRONT>
< TUNER SECTION >
1. Clock frequency Check
Settings :
• Test point :
TP3 (CLK)
Method :
Set to AM 1710 kHz and check that the test point is
2160 kHz ± 45 Hz.
2. AM VT Check
Settings :
• Test point :
TP4 (VT)
Method :
Set to AM 1710 kHz and check that the test point is less
than 8.5 V. Then set to AM 530 kHz and check that the
test point is more than 0.6 V.
3. AM Tracking Adjustment
Settings :
• Test point :
TP8 (Rch), TP9 (Lch)
• Adjustment location : L981 (1/3)
Method :
Set to AM 1000 kHz and adjust L981 (1/3) so that the
test point becomes maximum.
4. AM IF Adjustment
Settings :
• Test point :
TP8 (Rch), TP9 (Lch)
• Adjustment location :
L772 ................................................... 450 kHz
5. FM VT Check
Settings :
• Test point :
TP4 (VT)
Method :
Set to FM 87.5 MHz check that the test point is more
than 0.5 V. Then set to FM 108.0 MHz and check that
the test point is less than 8.0 V.
6. FM Tracking check
Settings :
• Test point :
TP8 (Rch), TP9 (Lch)
Method :
Set to FM 98.0 MHz and check that the test point
is less than 9 dBµV.
7. DC Balance / Mono Distortion Adjustment
Settings :
• Test point :
TP5, TP6 (DC Balance)
TP8 (Rch), TP9 (Lch)
(Mono Distortion)
• Adjustment location : L771
• Input level :
60 dBµV
Method :
Set to FM 98.0 MHz and adjust L771 so that the voltage
between TP5 and TP6 becomes 0 V ± 0.04 V with
minimum distortion.
8. Output Level Check
<AM>
Settings :
• Test point :
TP8 (Rch), TP9 (Lch)
• Input level : 74 dBµV
Method :
Set to AM1000 kHz and check that the test point is
140 mV ± 3 dB.
<FM>
Settings :
• Test point :
TP8 (Rch), TP9 (Lch)
• Input level :
60 dBµV
Method :
Set to FM 98.0MHz and check that the test point is
600 mV ± 3 dB.
9. FM Separation Check
Settings :
• Test point :
TP8 (Rch), TP9 (Lch)
• Input level :
60 dBµV
Method :
Set to FM 98.0 MHz and check that the test point is
more than 25 dB.
< FRONT SECTION >
1. µ-CON OSC Adjustment
Settings :
• Test point :
TP1 (KEY-SCAN)
TP2 (GND)
• Adjustment location : L201
Method :
Insert AC plug while pressing of "POWER" key and
"TUNER" function key.
Connect a frequency counter across TP5 and TP6.
Then adjust L201 so that the test point becomes
97.257 Hz ± 0.097 Hz.
[ Manual Reset ]
Make up for RESET after adjustment.
* Reset is to press "POWER" key while pressing of
"CLEAR (STOP)" key.
– 29 –
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