Deck Section - Aiwa NSX-D737 Service Manual

6. REC/PB
Settings :
Method :
of the 10kHz signal is +0.5dB+0.5dB with
respect to that of the 1kHz signal.
Sensitivity Adjustment
*Test tape: TTA-601
(TTA — 600)
*Test point: TP CONN 7P (PIN301) ©,@
*Input signal : 400Hz (LINE IN)
+ Adjustment location: SFR301 (Lch)
SFR302 (Rch)
Apply a 400Hz signal and REC mode. Then
adjust OSC attenuator so that the output
level at the TP CONN 7P (PIN301) ©,®©
is 28mV.
Record and play back the 400Hz signal and
adjust SFRs so that the output is 28mV
+ 0.5dB.
PRACTICAL SERVICE FIGURE (DECK)
DECK SECTION
Tape speed :
Wow & flutter :
Take-up torque:
3000Hz + 1.5%
Less than 0.4% (R.M.S)
30~55g-cm (FWD, REV)
F.F torque: 75~170g- cm
Rew torque : 75~170g- cm
Back tension : 2~5g-cm
PB Output level:
280mV + 20mV (CONN 7P)
REC/PB Output level : 280mV + 2dB (CONN 7P)
Distortion
Noise level (PB) :
(REC/PB): Less than 3% (CrO,)
Less than 3% (NORMAL)
Less than 1.0mV/1.4mV
(DOLBY B NR ON/OFF
CrO2)
7. Bias OSC Frequency Adjustment
Settings : *« Test tape : TTA-601
*Test point :
TP BIAS CHECK (C403)
Adjustment location : L401
Method: Set to the REC mode. Adjust L401 so that
the frequency counter of the test point
reads 106kHz + 2kHz.
Less than 13mV/1.8mV
(DOLBY C NR ON/OFF
NORM)
Noise level (REC//PB) :
Erasing ratio:
REC bias frequency :
Test tape:
57
Less than 1.2mV/1imV
(DOLBY B NR ON/OFF
CrOz)
Less than 1.3mV/2.imV
(DOLBY B NR ON/OFF)
MORM)
More than 60dB (15Fiz)
106kHz
NORMAL TTA — 601/600
CrO, TTA — 610
METAL TTA-—630