CIRCUIT
ADJUSTMENT
TPlOl
or
TP201
[;mrd
Modeprk
/Ej
SETTING
POSITION
OF SWITCH
AND KNOB
ITEM
BIAS
OSCILLATOF
FREQUENCY
Dolby
NR
Switch: off
Dubbing Speed Selector Switch: Normal
Deck 1 Tape Selector Switch: Normal
Deck 2 Tape Selector Switch: Normal
Dubbing Source Selector Switch: Line
Frequency
Counter
--L-=-l
I
GND
Figure
8-
1 BIAS OSCILLATOR FREQUENCY
INPUT
REMARKS
(CHECK1
ADJUST-
MENT
POINTS
L301
L: VR301
R:
VR302
-
Test tape L: VR104
MTT-150
R:
VR204
Test tape
MTT-150
-
Non-recorded
tape
(MTT-502)
1 kHz,
-13 dBV
(-3
dB
REC)
L: VR103
R:
VR203
105
i5
kHz
Record Mode
TP301
Erase
BIAS
CURRENT
Normal: 13 V
croz:
19
v
Metal: 30 V
Figure 8-2 ERASE CURRENT
Electronic
Voltmeter
Record Mode
R305
(L-ch)
or
R306
0%ch)
Figure 8-3 BIAS CURRENT
Electronic
ERASE
CURRENT
Metal: 36
_+4
V
Normal: 540 mV
DECK 1
PLAYBACK
SENSITIVITY
DECK 2
PLAYBACK
SENSITIVITY
See that the electronic
voltmeter reading is
within the range from
481 mV to 606 mV.
If not, take the proce-
dures shown in the
Table
l
1.
RECORD/
PLAYBACK
SENSITIVITY
1.
Adjust the record
level knobs so that
the electronic volt-
meter reads 380
mV.
2. Playback the normal
tape recorded and
adjust the semi-
variable resistor so
that the electronic
volt-meter read 380
mV.
Voltmeter
LINE
Playback Mode QUT
1
m
Unit
0
0
GND
Test
MTT
/
Figure 8-4 DECK l/DECK 2 PLAYBACK SENSITIVITY
LINE
L
Low Frequency
Oscillator
iN
/
rd
Mode
Table
*I
Voltmeter reads
More than 606 mV
Less than 481 mV
Procedures
Cut the resistor
Rl
11, R211
Cut the resistor
R109,
R209
,
--6’
LINE
Electronic
OUT Playback
.
-
ze
I
Non
-recorded
Tape
MTT-502
Figure 8-5 RECORD/PLAYBACK SENSITIVITY
-8-
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