Circuit Adjustment; Schaltungseinstellung; Rcglage Du Circuit - Sharp Rt-W500H Servicehandbuch

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