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RS-B14
* Test tape...QZZCFM
1. Test equipment connection is shown in fig. 2.
2. Playback the frequency response
portion of test tape | Playback frequency response chart
(022СЕМ):
3. Measure output level at 315Hz, 12.5kHz, 8kHz, 4kHz, 1kHz,
amt
ШЕШІНЕ ne
with the standard frequency 315Hz, at LINE OUT.
63H
H
н:
H2
н:
н:
z
Fig. 8
©
Playback gain
Condition:
Equipment:
* Playback mode
* VTVM
* Normal tape mode
* Oscilloscope
* Test tape...QZZCFM
1. Test equipment connection is shown in fig. 2.
2. Playback standard recording level portion on test tape (QZZCFM
315Hz) and, using VTVM, measure the
output level at LINE OUT.
3. Make measurements for both channels.
[ Standard value: 0.4V+1dB
|
гар.
@ Erase current
Condition:
Equipment:
* Record mode
• VTVM
* Metal tape mode
* Oscilloscope
Erase head
. Test equipment connection is shown in fig. 9.
. Place UNIT into metal tape mode.
. Press the record and pause buttons.
. Read
voltage on VTVM
and calculate
erase
current
by following
formula:
AON-
Record mode
R84
(12
Voltage across resistor R84
Fe
1 (Q)
Standard value:
155+15mA (Metal)
Erase current (A) =
5. If the measured
value is not within the standard value adjust it by
following the adjustment instructions.
Adjustment
* |f the erase current is more than 170mA, cut the jumper wire (See fig. 1).
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