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< TUNER SECTION >
1. Clock Frequency Check
Settings:
• Test point: TP2 (CLK)
Method:
Set to MW 1602kHz and check that the test point
is 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 Tracking Adjustment
Settings:
• Test point: TP8 (Lch), TP9 (Rch)
• Adjustment location: L951 (1/3)
Method:
Set to MW 999kHz and adjust L951 (1/3) so that
the test point becomes maximum.
4. LW VT Adjustment
Settings:
• Test point: TP1 (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.
5. LW Tracking Adjustment
Settings:
• Test point: TP8 (Lch), TP9 (Rch)
• 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.
6. AM IF Adjustment
Settings:
• Test point: TP8 (Lch), TP9 (Rch)
• Adjustment location:
L802 ....................................................................... 450kHz
7. FM VT Check
Settings:
• Test point: TP1 (VT)
Method:
Set to FM 108.0MHz and check that the test point
is less than 8.0V. Then set to FM 87.5MHz and
check that the test point is more than 0.5V.
8. FM Tracking Check
Settings:
• Test point: TP8 (Lch), TP9 (Rch)
Method:
Set to FM 98.0MHz and check that the test point
is less than 13dBµV.
9. DC Balance/Mono Distortion Adjustment
Settings:
• Test point: TP3, TP4 (DC balance)
TP8 (Lch), TP9 (Rch) (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±0.04V.
Next, check that the distortion is less than 1.3%.
< DECK SECTION >
10. Tape Speed Adjustment (DECK 1)
Settings:
• Test tape: TTA-100
• Test point: TP8 (Lch), TP9 (Rch)
• Adjustment location: SFR701
Method:
Play back the test tape and adjust SFR701 so that
the frequency counter reads 3000Hz±5Hz.
11. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings:
• Test tape: TTA-330
• Test point: TP8 (Lch), TP9 (Rch)
• Adjustment location: Head azimuth adjustment
Method:
Play back (FWD) the 8kHz signal of the test tape
and adjust screw so that the output becomes
maximum.
Next, perform on REV PLAY mode.
12. PB Frequency Response Check (DECK 1, DECK 2)
Settings:
• Test tape: TTA-330
• Test point: TP8 (Lch), TP9 (Rch)
Method:
Play back the 315Hz and 8kHz signals of the test
tape and check that the output ratio of the 8kHz
signal with respect to that of the 315Hz signal is
within 4dB.
13. PB Sensitivity Check (DECK 1, DECK 2)
Settings:
• Test tape: TTA-200
• Test point: TP8 (Lch), TP9 (Rch)
Method:
Play back the test tape and check that the output
level of the test point is 110mV±3.5dB.
14. REC/PB Frequency Response Check (DECK 1)
Settings:
• Test tape: TTA-602
• Test point: TP8 (Lch), TP9 (Rch)
• Input signal: 1kHz/8kHz (LINE IN)
Method:
Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at the test
points becomes -20VU. Record and play back
the 1kHz and 8kHz signals and check that the
output of the 8kHz signals is 0dB±5dB with
respect to that of the 1kHz signal.
15. REC/PB Sensitivity Check (DECK 1)
Settings:
• Test tape: TTA-602
• Test point: TP8 (Lch), TP9 (Rch)
• Input signal: 1kHz (LINE IN)
Method:
Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at TP8,
TP9 becomes 0VU. Record and play back the
1kHz signals and check that the output is
-2dB±3.5dB.
< FRONT SECTION >
16. u-CON OSC Adjustment
Settings:
• Test point: TP5
• Adjustment location: L101
Method:
Insert AC plug with pressing of TUNER function
key and POWER key. Adjust L101 so that the
frequency across the test point is
58.350Hz±0.02Hz.
49
screw
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