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6. REC/PB
Settings :
Method :
Sensitivity Adjustment
«Test tape : TTA-601
(TTA
— 600)
*Test point: TP CONN 7P (PIN301) ©.@
«Input signal
: 400Hz (LINE IN)
* Adjustment location : SFR301 (Lch)
SFR302 (Rech)
Apply a 400Hz signal and REC mode. Then
adjust OSC attenuator so that the output
level at the TP CONN 7P (PIN3O1) ©.©
is 28mV.
Record and play back the 400Hz signal and
+ 0.5dB.
PRACTICAL SERVICE FIGRE (DECK)
DECK SECTION
Tape speed :
3000Hz + 1.5%
Wow & flutter:
Less than 0.4% (RM.S)
Take-up torque :
30~60g-cm (FWD, REV)
FF torque :
T~140g-cm
Rew
torque :
T~140g- cm
Back tension :
2~6g-cm
PB Output level :
250mV
+ 50mV (REC OUT)
REC/PB
Output level : 190mV + 1dB (REC
OUT)
Distortion (REC/PB) : Less than 2.5% ( Cr0.)
Noise level (PB) :
Less than 2.0% ( NORMAL)
Less than 2.0mV/1.4mV
(DOLBY B NR ON/OFF
CrO; )
7. Bias OSC Frequency Adjustment
Settings : * Test tape: TTA-601
Method :
*Test point: TP BIAS CHECK (C403)
« Adjustment Location : L401
Set to the REC mode. Adjust L401 so that
the frequency counter of the test point
reads 106kHz
+ 2kHz.
Less than 1.3mV/1.8mV
(DOLBY B NR ON/OFF
NORM)
Noise level
(REC/PB) :
Erasing ratio:
REC bias frequency :
Test tape :
Less than 1.3mV/2.0mV
(DOLBY B,C NR ON/OFF
NORM)
Less than 1.2mV/1.5mV
(DOLBY B,C NR ON/OFF)
CrO,,METAL)
More than 60dB
(125Hz)
106kHz
NORMAL
TTA
— 601/600
CrO,
TTA —610
METAL
TTA-—630
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