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< TUNER SECTION >
1. Clock Frequency Check
Settings:
• Test point: TP2
Method:
Set to MW 1602kHz and check that the test
point becomes 2052kHz±45Hz.
2. MW VT Check
Settings:
• Test point: TP1 (VT)
Method:
Set to MW 1602kHz and check that the test
point is less than 8.0V.
Then set to MW 531kHz and check that the
test point is more than 0.6V.
3. MW IF Adjustment
Settings:
• Test point: TP8, TP9
L772 .............................................. 450kHz
4. MW Tracking Adjustment
Settings:
• Test point: TP8, TP9
• Adjustment location: L981
Method:
Set to MW 999kHz and adjust L981 so that the
test point becomes maximum.
5. FM VT Check
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).
6. LW VT Adjustment
Settings:
• Test point: TP2 (VT)
• Adjustment location: L942
Method:
Set to LW 144kHz and adjust L942 so that the
test point becomes 1.3V±0.05V.
Then set to LW 290kHz and check that the test
point is less than 8.0V.
7. LW Tracking Adjustment
Settings:
• Test point: TP8, TP9
• Adjustment location:
L941 .............................................. 144kHz
TC942 ........................................... 290kHz
Method:
Set up TC942 to center before adjustment.
The level at 144kHz is adjusted to maximum
by L941. Then the level at 290kHz is adjusted
to maximum by TC942.
8. DC Balance/Mono Distortion Adjustment
Settings:
• Test point: TP3, TP4
• Adjustment location: L771
• Input level: 60dB
Method:
Set to FM 98.0MHz and adjust L771 so that
the voltage between TP3 and TP4 becomes
0V±0.04V.
Next, check that the distortion is less than
1.3%.
< DECK SECTION >
9. Tape Speed Adjustment
Settings:
• Test tape: TTA-100
• Test point: TP8, TP9
• Adjustment location: SFR701
Method:
Playback the test tape by DECK2 and adjust
SFR701 so that the frequency counter reads
3000Hz±5Hz. Check that the counter reading
in the REV mode is within the range of ±45Hz
of that in the FWD mode.
10. Azimuth Adjustment
Settings:
• Test tape: TTA-330
• Test point: TP8, TP9
• Adjustment location: Head azimuth
Method:
Playback the 10kHz signal of the test tape and
adjust the adjustment screw so that the output
becomes the -0.5dB point below the maximum
reading. The adjustment must ends with the
clockwise rotation of the adjustment screw.
Perform this adjustment in both FWD and
REV directions. Fix the adjustment screw with
adhesive agent upon completion of adjustment.
11. PB Sensitivity Check
Settings:
• Test tape: TTA-200
• Test point: TP8, TP9
Method:
Play back the test tape and check the output
level of the TP301 becomes 110mV±3mV.
12. REC/PB Frequency Response Check
Settings:
• Test tape: TTA-602
• Test point: TP8, TP9
• Input signal: 1kHz/10kHz (LINE IN)
Method:
Establish the record mode. Input the 1kHz and
the 10kHz signals from LINE IN with the input
level so that TP8, TP9 has the signal level of 8-
10mV. Record the 1kHz and the 10kHz
signals, then play them back. Adjust the output
difference between the 1kHz and the 10kHz
signals becomes 0dB±0.5dB.
13. REC/PB Sensitivity Check
Settings:
• Test tape: TTA-602
• Test point: TP8, TP9
• Input signal: 1kHz /10kHz (LINE IN)
Method:
Establish the record mode. Input the 1kHz
signal from LINE IN with the input level so
that TP301 has the signal level of 80-100mV.
Record the 1kHz signal, then play it back.
Check the output level becomes -2.0dB±3.5dB.
< FRONT SECTION >
14. Micom Clock Adjustment
Settings:
• Test point: TP10 (CLK), TP11 (GND)
• Adjustment location: L331
Method:
Set the frequency counter between TP10 and
TP11. Adjust L331 so that test points become
166.89Hz±0.16Hz.
45
adjustment screw
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