Electrical Adjustment - Sharp Rt-150H Serviceanleitung

RT-150H
©
BIAS CURRENT ADJUSTMENT
@ Connect instruments as shown in Figure 6-1 and adjust vari-
able resistor VR301 or VR302 so that bias current available
with the tape selector switch set at each position is shown
in Table 6-1.
VR301 (L-ch),
Tape selector Voltage
switch (Bias current)
ERASE VOLTAGE CHECK |
@ Connect instruments as shown in Figure 6-2 and check it the
erase voltage is as shown in Table 6-2.
Tape selector switch Voltage (erase voltage)
Metal 34.5 ~ 38.5V
Table 6-2
PLAYBACK SENSITIVITY ADJUSTMENT
@ Connect instruments as shown in Figure 6-3 and adjust vari-
able resistor VR101 or VR201 so that the playback sensi-
tivity is as shown in Table 6-3.
' | 580 mV
Table 6-3
Switch
Adjustment
VR101 (L-ch),
VR201 (R-ch)
| Tape selector switch at ''normal"'
Dolby NR switch at "off''.
RECORD/PLAYBACK SENSITIVITY ADJUSTMENT
@ Connect instruments as shown in Figure 6-4, adjust variable
resistor VR103 or VR203 so that the record/playback sen-
sitivity is as shown in Table 6-4 and 6-5.
aakaid Attenuater
| 410 mV
VR102 (L-ch)
Play-
back
Table 6-4
V R202 (R-ch)
| Table 6-5
Tape selector switch
at ''normal"'.
Dolby NR switch at
"oft".
VR103 (L-ch),
VR203 (R-ch)
Test tape
MTT-150
(400 Hz,
200 pWb/mm)
ELECTRICAL ADJUSTMENT
REC/PB head
t Electronic
\. J) voltmeter
Record mode wd TP101 (L-ch)
TP201 (R-ch) a
Ground
Figure 6-1
ERASE head
Electronic
Voltmeter
Ground
Figure 6-2
Electronic
voltmeter
- TP103 (L-ch)
Playback mode TPI20903 (R-ch
REC/PB
head
Ground
Figure 6-3
Line in J4-A (L-ch)
| J4-B (R-ch)
CR Oscillator Record mode
Attenuater
1kHz, 316mV REC/PB | (MTT-502)
Ground |
Figure 6-4
Normal tape