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< TUNER SECTION >
1. Clock Frequency Check
Settings : • Test point :
Method :
Set to AM 1710 kHz and check that the test point is
2160 kHz ± 45 Hz.
2. AM VT Check
Settings : • Test point :
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 :
• Adjustment location : L951 (1/3)
Method :
Set to AM 1000 kHz and adjust L951 (1/3) so that the
test point becomes maximum.
4. FM VT Adjustment
Settings : • Test point :
• Adjustment location : L906
Method :
Set to FM 108.0 MHz and adjust L906 so that the test
point becomes 7.0 V ± 0.1 V. Then set to
FM 87.5 MHz and check that the test point is more
than 0.4 V.
5. FM Tracking Adjustment
Settings : • Test point :
• Adjustment location : L903
Method :
Set to FM 87.5 MHz and adjust L903 so that the test
point becomes maximum.
6. AM IF Adjustment
Settings : • Test point :
• Adjustment location :
L802 ................................................... 450 kHz
7. DC Balance / Mono Distortion Adjustment
Settings : • Test point :
• Adjustment location : L801
• Input level :
Method :
Set to FM 98.0 MHz and adjust L801 so that the
voltage between TP12 and TP13 becomes
0 V ± 500 mV with distortion less than 0.5 %.
TP11 (CLK)
TP10 (VT)
TP14 (Lch), TP15 (Rch)
TP10 (VT)
TP14 (Lch), TP15 (Rch)
TP14 (Lch), TP15 (Rch)
TP12, TP13 (DC balance)
TP18 (Lch), TP19 (Rch)
(Mono distortion)
60 dBµV
8. Output Level Check
<AM>
Settings : • Test point :
• Input level :
Method :
Set to AM 1000 kHz and check that the test point is
105 mV ± 3 dB.
<FM>
Settings : • Test point :
• Input level :
Method :
Set to FM 98.0 MHz and check that the test point is
420 mV ± 3 dB.
9. FM Separation Check
Settings:
• Test point :
• Input level :
Method:
Set to FM 98.0 MHz and check that the test point is
more than 25 dB.
< FRONT SECTION >
1. µ-CON Clock Adjustment
Settings : • Test point :
• Adjustment location : L901
Method : Insert AC plug while pressing of "POWER" key and
"CLOCK" function key. Connect a frequency counter
across TP16 and TP17. Then adjust L901 so that the
frequency across the test point is 226.98 Hz ± 0.23 Hz
(4.40 msec ~ 4.41 msec).
– 39 –
TP14 (Lch), TP15 (Rch)
74 dBµV
TP14 (Lch), TP15 (Rch)
60 dBµV
TP14 (Lch), TP15 (Rch)
60 dBµV
TP17 (K-SCAN)
TP16 (GND)
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