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Circuit Adjustment; Rcglage Du Circuit - Sharp RT-W500H Service Manual

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

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