Sharp GF-9000H - Page 12

e Battery Condition Meter Check
1) Connect a regulated power supply (DC 14.8 V) to the
battery terminal. See Fig. 16—1.
2) Set the power switch at “‘on” and the mode selector switch
at “radio” position, then see that the battery meter’s
pointer is situated in the “FULL (red)” zone.
3) Reduce voltage of the regulated power supply gradually
to 10.0 + 1V, then see that the battery pointer is about
at the border line between the red and violet zones.
e Playback Amplifier Sensitivity Adjustment
1) Make connection of instruments as shown in Fig. 16—2.
2) Set the mode selector switch at “tape”, the Dolby NR
switch at “off’’ and the tape selector switch at “normal”
position.
3) Put a test tape (TEAC, MTT-150, 400 Hz, 200 pWb/m
prerecorded) into the unit and play it back.
4) Adjust the semi-variable resistor (VR203 or VR204)
so that the electronic voltmeter reading will be 580 mV.
e Record Amplifier Sensitivity Check
1) Make connection of instruments as shown in Fig. 16—3.
2) Short pins @) and 2) of CNP202 to cause a stop of the
oscillation.
3) Set the mode selector switch at “tape’’, the tape selector
switch at “normal” and the record mode selector switch at
“auto” position.
4) From the audio generator, apply a signal of 1 kHz (0 dB
= 1¥V) to the uint.
5) Place the unit in record mode, and see that the electronic
voltmeter reads 1.75mV with each of the input jacks
being given the input signal whose level is shown below.
Input Jacks | Input Level
Ext. Mic 0.18 ~ 0.35 mV (—72 + 3dB)
DIN
IN
0.18
~
0.35
mV
(-72
+
3dB)
|
e Record/Playback Sensitivity Adjustment
1)
Make
connection
of
instruments
as
shown
in
Fig.
16—5.
2)
Set
the
mode
selector
switch
at
“tape”,
the
tape
selector
switch
at
“normal”,
the
record
mode
selector
switch
at
“manual”
and
the
Dolby
NR
switch
at
“off”
position.
3) From the audio generator, apply a signal of oscillation
frequency 1 kHz.
4) Place the unit in record mode, and adjust the record level
control
so
that
the
electronic
voltmeter
reading
will
be
200 mV.
5) Playback the normal tape which has been recorded in
the step 4), and adjust the semi-variable resistor (VR205
or
VR206)
so
that
the
electronic
voltmeter
reading
will
be 200 mv.
battery terminal
regulated power supply radio
test tape
MTT-150
3 record/playback
head
( playback mode J
Figure 16—1
$0301
grin {L-ch) electronic
Pin
(R-ch)
voltmeter
$0301
@) Pin (GND)
Figure 16—2
external mic jack
J303 (L-ch)
J304 (R-ch)
audio generator
attenuator
(100
ohm)
Figure 16—3
record/playback head
R207 or R208
mode
oscilloscope
electronic
voltmeter
Figure 16—4 ADJUSTMENTS & CONNECTION POINTS
audio generator
:
1
kHz
electronic
oscilloscope
—60dB
voltmeter
—16—
external mic jack
4303 (L-ch)
4304 (R-ch}
attenuator
$0301
8 Pin (L-ch)
Pin (R-ch) playback mode
$0301
@ Pin (GND)
Figure 16—5
record/playback
head |
Coy
Nee