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4. PB
Sensitivity
Adjustment
Settings:
* Test
tape:
TTA-200
* Test point :
J501 (LINE OUT)
LOAD
47k 2
+ Adjustment
location : SFR101
(Lch)
SFR102
(Rch)
Method : Play back
the test tape and adjust SFRs
so that the output level of the test point
becomes
520 + 20mV.
5. Bias OSC. Frequency
Adjustment
TTA-630
* Test point :
TP1
(R303)
- Adjustment
location : L303
Method:
Set to the REC
mode
and adjust L303 so
that the frequency
counter
of the test
point reads 85kHz
+ 0.2kHz.
Settings:
+ Test
tape:
6. REC/PB
Frequency
Response
Adjustment
Settings:
+° Test tape:
TTA-601
* Test point :
J501 (LINE OUT)
¢Input
signal :
1kHz/ 15kHz
(LINE IN)
*BIAS
VR:
Center
*DOLBY
NR:
OFF
+ Adjustment location : SFR301 (Lch)
SFR302 (Rch)
Method:
Apply
a 1kHz
signal and adjust REC
LEVEL VR attenuator so that the output
level at the LINE
OUT
jack is 37mV.
Record and play back the 1kHz and 10kHz
signals and adjust SFRs so that the output
of the 10kHz
signal is 0dB+0.5dB
with
respect
to that
of the
1kHz
signal.
7. REC/PB
Sensitivity
Adjustment
Settings:
+* Test
tape:
TTA-601
(TTA — 600)
*Test
point :
J501 (LINE OUT)
«Input
signal :
1kHz
(LINE IN)
*REC
SENS. VR:
CENTER
+ Adjustment location : SFR201
(Lch)
SFR202
(Rch)
Method:
Apply
a 1kHz
signal.
and
adjust
REC
LEVEL VR so that the output level at the
J501 (LINE
OUT)
is 37mV.
Record
and play back
the 1kHz
signal and
adjust SFRs
so that the output is 0+0.5dB.
19
PRACTICAL SERVICE FIGURE
DECK SECTION
Tape
speed :
Wow & flutter:
Take-up
torque:
F.F torque :
Rew
torque :
Back
tension :
PB Output
level :
REC/PB
Output
level:
Distortion (REC/PB)
:
Noise level (PB) :
Noise level (REC/PB)
:
Crosstalk :
Erasing ratio:
Channel
separation :
REC
bias frequency :
Test tape:
3000Hz + 1.5%
Less than 0.08%
(W.RMS)
25~65g-cm
(FWD,
REV)
80~160g-cm
80~160g-cm
2~6g-cm
520+ 50mV
(Line OUT)
370mV + 1dB (OVU)
Less than 2%
(NORM,
CrOz)
Less than 2.2mV/3.3mV
(DOLBY
B NR
ON/OFF
CrO,,
EMPTY
TAPE,
LINEAR)
Less than 2.4mV/4.4mV
(DOLBY
B NR
ON/OFF
NORM, EMPTY
TAPE, LINEAR)
Less than 2.3mV/4.7mV
(DOLBY
B NR
ON/OFF
NORM,
WTD)
Less than 1.9mV/3.7mV
(DOLBY
B NR
ON/OFF
CrO., WTD)
More than 60dB (1kHz, OVU)
More than 60dB
(125Hz)
More than 32dB (1kHz, 0VU)
85kHz
NORMAL
TTA — 601/600
CrOz
TTA — 610
METAL
TTA — 630
PB
TTA — 200
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