Aiwa SX-NBL25 Service Manual page 24

ADJUSTMENT – 2 <DECK>
< DECK SECTION >
1. Tape Speed Adjustment (DECK 2)
Settings : • Test tape :
• Test point :
• Adjustment location : SFR1
Method : Play back the test tape and adjust SFR1 so that the
test point becomes 3000Hz ± 5Hz (FWD) and FWD
SPEED ± 45Hz (REV) with respect to forward speed.
2. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings : • Test tape :
• Test point :
• Adjustment location : Head azimuth
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.
3. PB Frequency Response Check (DECK 1, DECK 2)
Settings : • Test tape :
• Test point :
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.
4. PB Sensitivity Check (DECK 1, DECK 2)
Settings : • Test tape :
• Test point :
Method : Play back the test tape and check that the output level
of the test point is 110mV ± 3dB.
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TTA–100
TP8 (Lch), TP9 (Rch)
TTA–330
TP8 (Lch), TP9 (Rch)
adjustment screw
TTA–330
TP8 (Lch), TP9 (Rch)
TTA–200
TP8 (Lch), TP9 (Rch)
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5. REC/PB Frequency Response Adjustment (DECK 2)
Settings : • Test tape :
• Test point :
• Input signal :
• Adjustment location : SFR451 (Lch)
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 with
respect to that of the 1kHz signal.
6. REC/PB Sensitivity Check (DECK 2)
Settings : • Test tape :
• Test point :
• Input signal :
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.
TTA–602
TP8 (Lch), TP9 (Rch)
1kHz / 8kHz
(–20VU / –26dBV)
SFR452 (Rch)
TTA–602
TP8 (Lch), TP9 (Rch)
1kHz (0VU / –6dBV)