Adjustment - Sharp Rt-150H Serviceanleitung

RT-150H
BIAS CURRENT

ADJUSTMENT

• Connect instruments as shown in Figure 6-1 and adjust vari-
abte resistor VR301 or VR302
with the tape selector switch set at each position is shown
in Table 6-1.
Tape selector
(Bias current)
switch
40mV (400gA)
Normal
55
Cr02
(550
76
Metal
(760
Table
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
Metal
Table
PLAYBACK SENSITIVITY
• Connect instruments as shown in Figure 6-3 and adjust vari-
able resistor V R 101 or VR201 so that the playback sensi-
tivity is as shown in Table 6-3.
Switch
Tape selector switch at "normal"
Dolby NR switch at "off".
RECORD/PLAYBACK SENSITIVITY
• Connect instruments as shown in Figure 6-4, adjust variable
resistor V R 103 or VR203 so that the record/playback
sitivity is as shown in Table 6-4 and 6-5.
Step Switch
Tape selector switch
Record
at "normal".
Dolby NR switch
"off".
back
Cr02 tape
Metal tape
ELECTRICAL
so that bias current available
Voltage
Adjustment
VR301 (L-ch),
VR302 (R-ch)
65mV
650/1A)
Check ing
96mV
960uA)
6-1
Voltage (erase voltage)
34.5 38.5V
6-2
ADJUSTMENT
Adjustment
Voltage
VRIOI
580 mV
VR201 (R-ch)
Table 6-3
ADJUSTMENT
Voltage Adjustment
Attenuater
VR102
410 mv
VR202 (R-ch)
at
VR103 (L-ch),
VR203 (R-ch)
Table 64
34+• 487 mV
345& 487 mV
Table 66
ADJUSTMENT
Record mode
Unit
Record
unit
Test tape
(L-ch).
MTT-150
(400 Hz,
200 pWb/mm)
sen-
CR Oscillator
1kHz, 316mV
(—10dBV)
Electronic
vol tmeter
00
RECIPB
TPIOI (L-ch)
TP201
R102
R202
100 Ohm
Ground
Figure 6-1
ERASE head
TP301
Ground
Figure 6-2
TP103 (L-ch)
RECIPE
Playback mode
TP203 (R-ch)
Unit
Ground
Figure 6-3
Line in J4-A (L-ch)
J4-B (R-ch)
Record mode
At tenu.ter
unit
TP102 (L.ch)
TP202 Playback rno&
Unit
GroGnd
Figure 64
Electron ic
vottrnetør
00
Electronic
Vol tmeter
Electronic
voltmeter
00
RECIPB (MT TS02)
Cr02 tape
Metal tape
(AC.711)