Aiwa CX-NAK772, Руководство по обслуживанию

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PRACTICAL SERVICE FIGURE
13. PB Frequency Response Check (DECK1, DECK2)
Settings : • Test tape : TTA–330
• Test point :TP6(Lch), TP7(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 5dB.
14. PB Sensitivity Check (DECK1, DECK2)
Settings : • Test tape : TTA–200
• Test point : TP6(Lch), TP7(Rch)
Method : Play back the test tape and check that the output
level of the test point is 120mV ± 3dB.
15. REC/PB Frequency Response Adjustment (DECK2)
Settings : • Test tape : TTA–602
• Test point : TP6(Lch), TP7(Rch)
• Input signal : 1kHz / 10kHz (LINE IN)
• Adjustment location : SFR351 (Lch)
SFR352 (Rch)
Method : Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at the TP6,
TP7 becomes (-20VU) -36.5dBV. Record and play
back the 1kHz and 10kHz signals and adjust SFRs
so that the output of the 10kHz signals becomes
0dB ± 0.5dB with respect to that of the 1kHz
signal.
16. REC/PB Sensitivity Check (DECK2)
Settings : • Test tape : TTA–602
• Test point : TP6(Lch), TP7(Rch)
• Input signal : 1kHz (LINE IN)
Method : Apply a 1kHz signal and REC mode. Then adjust
OSC attenuator so that the output level at TP6, TP7
becomes 0VU (-16.5dBV). Record and play back
the 1kHz signals and check that the output is 0dB ±
3.5dB.
9. DC Balance / Mono Distortion Adjustment
Settings : • Test point : TP3, TP4 (DC Balance)
: TP8(Lch), TP9(Rch) (Distortion)
• Adjustment location : L771
• Input level : 54dB
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%.
10. Auto Stop Level Check
MW
• Input level : 52dB
• Test point : TP5
Method : Check auto stop at MW 999kHz and the level
is 52 +10/-15dB.
FM
• Input level : 25dB
• Test point : TP5
Method : Check auto stop at FM 98.0MHz and the level
is 25 dB ± 10 dB.
< DECK SECTION >
11. Tape Speed Adjustment (DECK1, DECK2)
Settings : • Test tape : TTA–100
• Test point : TP6(Lch), TP7(Rch)
• Adjustment location : SFR1
Method : Play back the test tape and adjust SFR1 so that
the frequency counter reads 3000Hz ± 5Hz.
Next, check that the REV speed is ±45Hz with
respect to FWD speed.
12. Head Azimuth Adjustment (DECK1, DECK2)
Settings : • Test tape : TTA–330
• Test point : TP6(Lch), TP7(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.
<TUNER SECTION>
<FM SECTION>
IHF Sensitivity : Less than 10 / 9 / 9dB
(THD 3%) [at 87.5 / 98.0 / 108.0MHz]
S/N 50dB Quieting sensitivity :
Less than 35dB [at 98.0MHz]
Signal to noise ratio : Mono : More than 72dB
Stereo : More than 66dB
[at 98.0MHz]
Distortion : Mono : Less than 1.2%
Stereo : Less than 2.0%
[at 98.0MHz]
Auto stop level : 25dB ± 10dB [at 98.0MHz]
Stereo separation : More than 30dB [at 98.0MHz]
Intermediate frequency : 10.7MHz
<MW SECTION>
Sensitivity : Less than 60dB [at 603kHz]
Less than 58dB [at 999kHz]
Less than 58dB [at 1404kHz]
Signal to noise ratio : More than 36dB [at 999kHz]
Distortion : Less than 1.5% [at 999kHz]
Auto stop level : 52dB +10/-15dB [at 999kHz]
Intermediate frequency : 450kHz
<SW SECTION>
Sensitivity : Less than 51dB [at 5.9MHz]
Less than 45dB [at 12.0 MHz]
Less than 44dB [at 17.9MHz]
Overload signal Distortion :
Less than 10.0% [at 12.0MHz]
Intermediate frequency : 450kHz
<DECK SECTION>
Tape speed : 3000Hz ± 45Hz
Wow & flutter : Less than 0.21% (W.R.M.S)
Take-up torque : 30 ~ 55g-cm (FWD, REV)
F.F & REW torque : 75 ~ 160g-cm
Back tension : 2 ~ 7g-cm (FWD, REV)
PB output level : 300mV ± 3.0dB (SP OUT 2V)
REC/PB output level : 0dB ± 3.0dB (SP OUT 2V,NORM)
Distortion (REC/PB) : Less than 2.0% (NORM)
Noise level (PB) : Less than 2.0mV (NORM, SP OUT
2V)
Noise level (REC/PB) : Less than 3.0mV (NORM, SP OUT
2V)
Erasing ratio : More than 60dB (at 125Hz, +10VU)
Test tape : TTA–100
TTA–200
TTA–602 (NORMAL)
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