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®
Playback gain
Condition:
Equipment:
(TAPE [1], TAPE [2] )
e Playback mode
e VTVM
e Normal tape mode
e Oscilloscope
e 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 test points [TP4 (L-CH), TP5 (R-CH)].
3. Make measurements for both channels.
Standard value: 0.42V [0.4V: at LINE OUT jack]
Adjustment
1. If the measured value is not within the standard, adjust TAPE
[1] VR1 (L-CH) or VR2 (R-CH), Tape
VR3
(L-CH) or VR4 (R-CH) (See fig. 1).
2. After adjustment, check "Playback frequency response" again.
@
Erase current
Condition:
Equipment:
(TAPE
)
e Record mode
° VTVM
e Metal tape mode
e Oscilloscope
1. Test equipment connection is shown in fig. 9.
2. Place UNIT into metal tape mode.
3. Press the record and pause buttons.
4. Read
voltage
on
VTVM
and
calculate
erase
current
by following
formula:
Erase head
Erase current (A)= Voltage eo
R152
Record mode
Standard value: 160 * . mA (Metal)
=
R152 (12)
5. If the measured
value is not within the standard value adjust it by
following the adjustment instructions.
Adjustment
Fig. 9
1. Short-circuit the registers R143, R144, R145.
(Refer to table 1)
2. Measure the erasing current.
R143
Change | ji1ustrations
VTVM
Oscilloscope
3. If the measured
value is not within the standard
value,
oes
a EERESETET
open
or
short-circuit
the
registers
R143,
R144,
R145
SQ
according to table 1.
Short
PA
ABsoieere
R143
R145
R144
Short
of
f
Soldered
R143
R145
R144
obo
Soldered
R143.
R145)
R144
Open
Table. 1
@
Overall frequency
Condition:
Equipment:
response
e Record/playback mode
e VTVM
e Test tape
(TAPE
)
e Normal tape mode
°© ATT
(reference blank tape)
e CrO, tape mode
e AF oscillator
...QZZCRA for Normal
e Metal tape mode
e Oscilloscope
...QZZCRX for CrO,
e Input level controls...MAX
e¢ Resistor (6002)
..-QZZCRZ for Metal
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