– 28 –
7. DC Balance / Mono Distortion Adjustment
Settings :
• Test point :
TP3, TP4 (DC)
• Adjustment location : L801
• Input level :
60dB
µ
V
Method :
Set to FM 98.0MHz and adjust L801 to achieve
minimum distortion. Then check that the voltage
between TP3 and TP4 is within 0V
±
300mV.
8. Output Level Check
<AM>
Settings :
• Test point :
TP8 (Lch), TP9 (Rch)
• Input level :
74dB
µ
V
Method :
Set to AM 1000kHz <LH,U,HA>, AM 999kHz <HS>
and check that the test point is 40mV
±
3dB.
<FM>
Settings :
• Test point :
TP8 (Lch), TP9 (Rch)
• Input level :
60dB
µ
V
Method :
Set to FM 98.0MHz and check that the test point is
140mV
±
3dB.
9. FM Separation Check
Settings :
• Test point :
TP8 (Lch), TP9 (Rch)
• Input level :
60dB
µ
V
Method :
Set to FM 98.0MHz and check that the test point is
more than 25dB.
< DECK SECTION >
10. Tape Speed Adjustment (DECK 2)
Settings :
• Test tape :
TTA–100
• Test point :
TP8 (Lch), TP9 (Rch)
• Adjustment location : SFR1
Method :
Play back the 3kHz signal of the test tape and adjust
SFR1 so that the test point becomes 3000Hz
±
5Hz
(FWD) and FWD SPEED
±
45Hz (REV).
11. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings :
• Test tape :
TTA–330
• Test point :
TP8 (Lch), TP9 (Rch)
• Adjustment location : Head azimuth
adjustment screw
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
0dB
±
5dB.
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
±
3dB.
14. REC/PB Frequency Response Adjustment (DECK 2)
Settings :
• Test tape :
TTA–602
• Test point :
TP8 (Lch), TP9 (Rch)
• Input signal :
1kHz / 8kHz
(–20VU / –26dBV)
• Adjustment location : SFR451 (Lch)
SFR452 (Rch)
Method :
Apply a 1kHz signal and REC mode. Then adjust OSC
attenuator so that the output level at the TP8, TP9
becomes 5.5mV ~ 9.5mV. Record and play back the
1kHz and 8kHz signals and adjust SFRs so that the
output of the 8kHz signals becomes 0dB
±
0.5dB
<LH,HA,HS>, –1.5dB
±
0.5dB <U> with
respect to that of the 1kHz signal.
15. REC/PB Sensitivity Check (DECK 2)
Settings :
• Test tape :
TTA–602
• Test point :
TP8 (Lch), TP9 (Rch)
• Input signal :
1kHz (0VU / –6dBV)
Method :
Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at TP8, TP9
becomes 55mV ~ 95mV. Record and play back
the 1kHz signals and check that the output is
–1dB
±
3.5dB.
Summary of Contents for NSX-AJ24 U
Page 14: ... 14 SCHEMATIC DIAGRAM 1 MAIN 1 2 AMP SECTION ...
Page 15: ... 15 SCHEMATIC DIAGRAM 2 MAIN 2 2 TUNER SECTION ...
Page 17: ... 17 SCHEMATIC DIAGRAM 3 FRONT DECK ...
Page 19: ... 19 SCHEMATIC DIAGRAM 4 PT 24U ONLY ...
Page 21: ... 21 SCHEMATIC DIAGRAM 5 PT EXCEPT 24U ...
Page 23: ... 23 IC BLOCK DIAGRAM ...
