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Fig. 7
AMPLIFIER ADJUSTMENTS
Conditions
for measurement
Power voltage
DC 9V
Instruments required: VTVM, AFC, ATT, Resistors, oscilloscope.
Record Head
t
\
SIGNAL SOURCE
= —- OUTPUT
|
|
:
T
PEC.
ITEM
CONNECTION
|
CONNECTION
| MODE
ADJUSTMEN
| SPEC
REMARKS
| Adjust the AF OSC so
VTVM with AF OSC
; that the Lissajous' figure
Measurement of
to both ends of
lA annean oa
1|
bias oscillation
——
record/playback
Record
—.
aoe
lary
frequency.
head.
circle, and the oscilation
:
| See fig. 7
| frequency is indicated
oe
by the scale of the AF
OSC.
—
re
: 2
|
eee
I
—
Satie aaa
|
|
Bias current
Measurement of
VTVM with 1009
ar
tea, S0Ah) =
2] recording bias
resistor.
Record
—
15 mv
ne
va
yO +5
Vv
current.
See fig. 8.
aa
:
aaCKUAE
|
Resistance value
(100Q)
\
|
VTVM with 100Q
3
pei
ll ad of
1 kHz ~7755 dB
resistor.
Record
aes
'35mvV
ee
recording level.
to MIC input jack. | ge fig. 9.
M
'
VTVM to both ends
4|
Measurement of
=
of erase head.
Record
—o
2.5V
Erase current (9 mA).
erase Current.
See fig. 10.
Measurement of | LkKHZ ene in VTVM with 8Q
5 | playback amplifier
eats
ee
resistor to EXT
Playback
—
1V
—
in.
;
jack.
gai
See-fig, 11.
speaker jack
|
_
"
|
VTVM with 80
6
Head angle adjust- | Thread the
3kHz | resistor to EXT
Playback
Maximum |
ee
ment.
adjustment tape.
speaker jack.
i
See fig. 12.
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