Aiwa NSX-SZ30 Service Manual Field page 21

B FRONT C.B
D DECK C.B<HA>
12
FWD
13
< DECK SECTION >
12. Tape Speed Adjustment (DECK 2)
Settings : • Test tape : TTA–100
• Test point : TP8(Lch), TP9(Rch)
• Adjustment location : SFR1
Method : Play back the test tape and adjust SFR1 so that the
frequency counter reads 3000Hz ± 5Hz (FWD) and
FWD SPEED ± 45Hz (REV).
13. Head Azimuth Adjustment (DECK 1, DECK 2)
Settings : • Test tape : TTA–330
• Test point : TP8(Lch), TP9(Rch)
• Adjustment location : 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.
14. 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 5.0dB.
15. 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 ± 3.0dB.
18
FL901
D981 D984
<HA> <HR>
TP11
IC901
L951
SFR1
DECK–1 P HEAD<HA>
DECK–2 R/P/E HEAD
REV
13
GND
+
C913
10µF
TP11
(KEY-SCAN)
(GND)
D DECK C.B<HR>
13
16. REC/PB Frequency Response Adjustment (DECK 2)
Settings : • Test tape : TTA–602
Method : Apply a 1kHz signal and REC mode. Then adjust OSC
17. REC/PB Sensitivity Check (DECK 2)
Settings : • Test tape : TTA–602
Method : Apply a 1kHz signal and REC mode. Then adjust OSC
< FRONT SECTION >
18. µ-con OSC Adjustment
Settings : • Test point : TP11(KEY-SCAN), GND
Method : Connect a frequency counter across TP11 and GND via
– 21 –
< CR NETWORK FILTER >
1kΩ 1SS133
10µF
1kΩ 0.1µF 47kΩ
DECK–1 P HEAD<HR>
FWD
• Test point : TP8(Lch), TP9(Rch)
• Input signal : 1kHz / 8kHz (LINE IN)
• Adjustment location : SFR451 (Lch)
SFR452 (Rch)
attenuator so that the output level at the TP8, TP9
becomes -20VU (-26dBV). Record and play back the
1kHz and 8kHz signals and adjust SFRs so that the
output of the 8kHz signals becomes 1.5dB ± 0.5dB with
respect to that of the 1kHz signal.
• Test point : TP8(Lch), TP9(Rch)
• Input signal : 1kHz (LINE IN)
attenuator so that the output level at TP8, TP9 becomes
0VU (-6dBV). Record and play back the 1kHz signals
and check that the output is -1dB ± 3.5dB.
• Adjustment location : L951
a CR network filter. Then adjust L951 so that the test
point becomes 184.94Hz ± 0.18Hz.
TO
FREQUENCY
COUNTER
SFR1
12
REV
13