Aiwa NSX-MT960 Service Manual page 28

7.
8.
DC Balance/ Mono Distortion Adjustment
Settings : Test point : TP3, TP4 (DC Balance)
Test point: TP8, TP9 (Distortion)
Adjustment location : L771
Input level : 54dB
Method : Set to FM 98.OMHZ and adjust L77 1 so that the
voltage between TP3 and TP4 becomes OV ~ 0.04V.
Next, check that the distortion is less than 1.3%
Auto Stop Level Check
MW
Settings :
Method :
FM
Settings:
Method :
Test point : TP5
Input level: 52dB
Set to AM 1000kHz and check that the auto stop is at
52dB +lOdB I -15dB.
Test point: TP5
Input level : 25dB
Set to FM 98.OMHZ and check that the auto stop is at
25dB k 10dB.
< DECK SECTION >
9. Tape Speed Adjustment (DECK 1, DECK 2)
Settings : Test tape: TTA–1OO
Test point : TP6(Lch), TP7(Rch)
Adjustment location : SFR 1
Method: Play back the test tape and adjust SFR1 so that the
frequency counter reads 3000Hz t 5Hz.
10. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings : Test tape : TTA–300
Test point: TP6(Lch), TP7(Rch)
Adjustment location : Head azimuth
adjustment screw
Method : Play back (FWD) the 10kHz signal of the test tape
and adjust screw so that the output becomes
maximum.
Next, perfom on REV PLAY mode.
11. PB Frequency Response Check (DECK 1, DECK 2)
Settings : Test tape : TTA–300
Test point :TP6(Lch), TP7(Rch)
Method : Play back the 3 15Hz and 10kHz signals of the test
tape and check that the output ratio of the 10kHz
signal with respect to that of the 3 15Hz signal is
within 2dB.
12. PB Sensitivity Adjustment (DECK 1, DECK 2)
Settings : Test tape: TTA–200
Test point : TP6(Lch), TP7(Rch)
Adjustment Location : SFR301 (DECK1 ,Lch)
SFR302 (DECK1 ,Rch)
SFR303 (DECK2,Lch)
SFR304 (DECK2,Rch)
Method : Play back the test tape and adjust SFRS so that the
output level at TP6,TP7 becomes 245mVt 10mV.
and 10kHz signals and adjust SFRS so that the output
of the 10kHz signals becomes OdB & 0.5dB with
respect to that of the lkHz signal.
14. REC/PB Frequency Response Check
Settings : Test tape : TTA–615
Method
Test point : TP6(Lch), TP7(Rch)
c Input signal : lkHz / 10kHz (LINE IN)
Apply a lkHz signal and REC mode, Then adjust
OSC attenuator so that the output level at the TP6,
TP7 becomes 17mV. Record and play back the lkHz
and 10kHz signals and check that the output is OdB
? 2dB.
15. REC/PB Sensitivity Adjustment
Settings : Test tape: TTA-602
Test point : TP6(Lch), TP7(Rch)
Input signal : lkHz (LINE IN)
" Adjustment location: SFR305 (Lch)
SFR306 (Rch)
Method : Apply a lkHz signal and REC mode. Then adjust
OSC attenuator so that the output level at the TP6,
TP7 becomes 170mV. Record and play back the
lkHz signals and adjust SFRS so that the output of
the lkHz signals becomes O~ 0.5dB.
16. REC/PB Sensitivity Check
Settings : Test tape : TTA–615
. Test point : TP6(Lch), TP7(Rch)
Input signal : 1kHz (LINE IN)
Method: Apply a lkHz signal and REC mode. Then adjust
OSC attenuator so that the output level at the TP6,
TP7 becomes 170mV. Record and play back the
lkHz signals and check that the output is O f 1.5dB.
13. REC/PB Frequency Response Adjustment
Settings : Test tape: TTA–602
Test point: TP6(Lch), TP7(Rch)
Input signat : lkHz / 10kHz (LINE IN)
Adjustment location: SFR351 (Lch)
SFR352 (Rch)
Method : Apply a lkllz signal and REC mode. Then adjust
OSC attenuator so that the output level at the TP6,
TP7 becomes 17mV. Record and play back the lkHz
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