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RT-155H/HB/E
©)
ELECTRICAL
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 as
shown in Table 6-1.
Tape selector
switch
Voltage
VR301
oe
|
ch),
VR302
oe
|
ch)
A3mV (430uA)
61 ~ 69mV
(610 ~ 690uA)
92 ~ 104mV
(920 ~ 1040uA)
Table 6-1
Checking
ERASE
VOLTAGE
CHECK
@ Connect instruments as shown in Figure 6-2 and check if the
erase voltage is as shown in Table 6-2.
Tape selector switch
Voltage (erase voltage)
|
Ere nada
AS
i
eee
Metal
190 ~ 230mV
|
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.
Switch
Voltage
~ Adjustment
Tape selector switch at ''normal"'.
580 mV
VR101
(L-ch),
Dolby NR switch at "off".
VR201
(R-ch)
Table 6-3
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.
Step
Switch
Voltage
Adjustment
Tape selector switch
Attenuater
R
t
ecord
Si anal
VR-102 (L-ch),
.
410 mV
VR202 (R-ch)
Dolby NR switch at
"off".
VR103 (L-ch),
V R203 (R-ch)
Table 6-4
Metal tape
Table 6-5
345 ~ 487 mV
345 ~ 487 mV
ADJUSTMENT
REC/P8 head
e9
Jd
TP101 (L-ch)
TP201 (R-ch)
Electronic
Voltmeter
Record mode
Ground
Figure 6-1
ERASE
head
Electronic
Voltmeter
Ground
Figure 6-2
Electronic
Test tape
MTT-150
(400 Hz
200 pWb/mm)
Ground
Figure 6-3
Line Input Socket
CR Oscillator
atrenuater 1 (J4-A or J4-B)
Normal
tape
REC/PB
1 kHz
Record mode
7
(MTT-502)
e
TP103 (L-ch)
oak
Electronic
TP203 (R-ch) Playback mode
Metal-tape
Voltmeter
(AC-711)
Ground
Figure 6-4
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