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AMPLIFIER ADJUSTMENTS
Measurement condition:
Supplied voltage ...... DC 9V
Volume control ...... Maximum
Tone control ...... Maximum
Equipment required:
VTVM, ATT, AF OSC, Oscilloscope, resistors (10, 80, 100Q, 600Q).
SIGNAL SOURCE
OUTPUT
ITEM
CONNECTION
CONNECTION
MODE
ADJUSTMENT
SPEC.
REMARKS
If there is no alignment
Head angle
tape, you may playback
uvateaue
Sis
Carats
VTVM with 8Q
adjustment
a music tape and adjust
i
ae
abea
resistor to EXT SP | Playback | screw @
Maximum | 't to the most suitable
adjustment.
| alignment tape.
sack
ae
A
position for listening
|
Jack.
ot
where the playback
fig. 7.
| sound is maximum and
!
highest.
|.
er nrat
ate
Erase current (50 mA)
Measurement of
;
bie
-
Voltage value
—~
resistor as shown
Record
VR3
50 mV
(50 mV)
erase Current.
aes
=
,
in fig. 8.
Resistance value
(1Q)
:
| Bias current (0.5 mA)
Measurement of
VTVM with 1000
Voltage value
3}
recording bias
_——
resistor as shown
Record
;
—o
50 mV
(50 mV)
current.
|
| in fig. 9.
= Resistance value
(1009)
kHz — 724408 | vty with 1000
Stop the bias oscillation
Measurement of
to MIC input jack.
,
;
'
resistor as shown
Record
—.
5 mV
by removing the
recording level.
1 kHz —30+4 dB
in fig.
10
Kecistor BEd.
to AUX input jack. | '7
"8
* * :
Measurement of
1 kHz —82+3dB
| VTVM with 80
5]
playback amplifier
| as shown in
resistor to EXT SP | Playback
—
lV
—
gain.
fig. 11.
jack.
}
i
i]
Adjust the AF OSC to
Oscilloscope with
obtain a circular and
Measurement of
AF OSC to both
stationary Lissajous'
6 | bias oscillator
—
ends of erase
Record
=
35-5 kHz) figure on oscilloscope.
frequenc
head as shown in
In this case, the
;
*
oscillation frequency is
fig. 12.
indicated by the scale
of the AF OSC.
12
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