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RS-B11W
©
Tape speed
Condition:
Equipment:
(TAPE
[1], TAPE
)
e Playback mode
e Digital frequency counter
e Dubbing tape speed switch
e Test tape... QZZCWAT
...Normal/high
Normal speed adjustment
: Playback head
TAPE
[1]
@: coe: head
LINE OUT
m
. Make connections as shown in fig. 7.
'
oon)
. Set the dubbing speed switch to Normal.
k "or
. Play the test tape
(QZZCWAT)
with
the TAPE
[1]
head,
and
Playback mode
Digital electronic counter
Test tape
measure
the playback signal frequency.
If the playback signal
frequency
does
not conform
to the standard
value, adjust
the
normal speed adjustment VRO1 for the TAPE
[1] head (See fig. 1).
Standard value: TAPE
[i] (Playback deck: Normal speed) 3010+45 Hz |
Fig. 7
TAPE
[2]
4. Play the test tape (QZZCWAT) with the TAPE
[2] head, and measure the playback signal frequency, then
adjust the normal speed adjustment VR01 for the TAPE
[2] head so that the playback signal frequency is
15Hz lower than the output signal frequency after adjustment of TAPE [i] .
High speed adjustment
Note:
Perform high speed adjustment about 10 seconds after the start of motor rotation.
. Make connections as shown in fig. 7.
. Set the dubbing/mixing switch to off, and set the dubbing speed switch to high.
Ground the resistor (R122).
. Play the test tape (QZZCWAT) with the TAPE
and measure the playback signal frequency.
If. the playback signal frequency does not conform to the standard value, adjust the high speed adjustment
VRO2 for the TAPE
(1] head (See fig. 1).
Standard value: TAPE
[i] (Playback deck: Normal speed) 6020+90 Hz |
. Play the test tape (QZZCWAT) with the TAPE
head, and measure the playback signal frequency, and then
adjust the high speed adjustment VRO2 for the TAPE
head so that the playback signal frequency is 30Hz
lower than the output signal frequency after adjustment of TAPE
[1].
5. After high speed adjustment, remove the ground the resistor (R122).
Tape speed fluctuation
TAPE [1], TAPE [2]
Make measurements
in same
manner as above (beginning, middle and end of tape), and determine the dif-
ference between maximum and minimum values and calculate as follows:
ify
3,000
Tape speed fluctuation (High speed) = oe x100(%)
f, =maximum value, f, = minimum
Standard value: Less than 0.15%
Note:
Please use non metal type screwdriver then you adjust tape speed on this unit.
Tape speed fluctuation (Normal speed) =
x100(%)
f,
=maximum value, f, = minimum
@
Playback frequency
Condition:
Equipment:
response
e Playback mode
e VTVM
(TAPE
[1], TAPE
)
e Normal tape mode
e Oscilloscope
° Test tape...QZZCFM
. Test equipment connection is shown in fig. 2.
Playback frequency response chart
2. Playback
the
frequency
response
portion
of test
tape
FE
Con
(QZZCFM).
|
. Measure output level at 315Hz, 12.5kHz, 8kHz, 4kHz, 1kHz,
+4d0B
i
{|
with the standard frequency 315Hz, at LINE OUT.
. Make measurements for both channels.
4
. Make sure that the measured
values are within the range
iH
specified in the frequency response chart (Shown in fig. 8).
—
63H2 100Hz200Hz4
S00Hz
1kHz
2kHz
4kHz
12.5 kHz
315Hz
6.3kHZ8kHz10kHz
0dB
—2dB
Typ
-3dB
250Hz,
125Hz
and 63Hz, and compare
each
output
level
TH
rH
ae
Fig. 8
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