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< TUNER SECTION >
1.
Clock Frequency Check
Settings:
¢
Test point: TP3 (CLK IC770 pin30)
Method:
Set to AM 1710kHz (LH), MW 1602kHz (EZ)
and check that the test point becomes
2160kHz+45Hz (LH), 2052kHz+45Hz (EZ).
AM VT Check (LH)
Settings:
¢
Test point: TP4 (VT)
Method:
Set to AM 1710kHz and check that the test
point is less than 7.0V.
Then set to AM 530kHz and check that the test
point is more than 0.5V.
MW VT Adjustment (EZ)
Settings:
¢
Test point: TP4 (VT)
Method:
Set to MW 1602kHz and check that the test
point is less than 8.5V.
Then set to MW 531kHz and check that the
test point is more than 0.5V.
MW (AM) IF Adjustment
Settings:
¢
Test point: TP8, TP9
AM Tracking Adjustment (LH)
Settings:
*
Test point: TP8, TP9
¢
Adjustment location: L981
Method:
Set to AM 1000kHz and adjust L981 so that
the test point becomes maximum.
MW Tracking Adjustment (EZ)
Settings:
¢ Test point: TP8, TPO
¢ Adjustment location: L981.
Set to MW 999kHz and adjust L981 so that the
Method:
—
test point becomes maximum.
FM VT Check
Settings:
¢
Test point: TP4 (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 8.5V (108.0MHz).
LW VT Adjustment (EZ)
Settings:
¢
Test point: TP2 (VT)
¢
Adjustment location: L942
Method:
Set to LW 144kHz and adjust L942 so that the
test point becomes 1.3V10.05V.
Then set to LW 290kHz and check that the test
point is less than 6.0V.
LW Tracking Adjustment (EZ)
Settings:
¢
Test point: TP8, TP9
*
Adjustment location:
L941
290kHz
Set up TC942 to center before adjustment.
The level at 144kHz is adjusted to MAX by
L941. Then the level at 290kHz is adjusted to
MAX by TC942.
Method:
8. DC Balance/Mono Distortion Adjustment
Settings:
Method:
¢
Test point: TP5, TP6
¢
Adjustment location: L771
¢
Input level: 54dB
Set to FM 98.0MHz and adjust L771 so that
the voltage between TP5 and TP6 becomes
0V+0.04V.
Next, check that the distortion is less than
1.3%.
< DECK SECTION >
9. Tape Speed Adjustment
Settings:
Method:
«
Test tape: TTA-100
¢ Test point: TP301
¢
Adjustment location: SFR1
Playback the test tape by DECK2 and adjust
SFR1 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:
Method:
¢ Test tape: TTA-300
¢
Test point: TP301
¢
Adjustment location: Head azimuth
adjustment screw
. Playback the 10kHz signal of the test tape and
adjust the adjustment screw so that the output
becomes the -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 Adjustment
Settings:
Method:
¢
Test tape: TTA-200
¢
Test point: TP301
e
Adjustment location:
SFR303 (Lch)
as
SFR304 (Rch)
Play back the test tape and adjust SFRs so that
the output level of the TP301 becomes 245mV.
12. REC/PB Frequency Response Adjustment
Settings:
Method:
*
Test tape: TTA-602
¢
Test point: TP301
¢ Input signal: 1kHz/10kHz (LINE IN)
¢
Adjustment location:
SFR351 (ich)
SFR352 (Rch)
Establish the record mode. Input the [kHz and
the 10kHz signals from LINE IN with the input
level so that TP301 has the signal level of
12mV. Record the 1kHz and the 10kHz
signals, then play them back. Adjust SFR so
that the output difference between the 1kHz
and the 10kHz signals becomes 0dB+0.5dB.
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