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4.
REC/BATT
Meter Calibration
Procedure:
1.
Supply
3.6 V de and place unit in playback
mode.
Adjust
Change
resistor
connection
(See figure
below)
Adjustment Location
5.
Overall Maximum
Output Measurement
Control/Switch Setting:
PB
VOL
control:
maximum
Procedure:
1.
Mode:
record
333 Hz, —60 dB (0.78 mV)
power source:
6 V dc
af osc
blank tape
C)
cassette
————
Mode : playback
recorded
portion
MONITOR
VTVM reading : greater than 1.9 V (8 dB)
-~15—-—"
8.
Erase Ratio Measurement
Playback Signal-to-Noise Ratio
Measurement
Procedure:
Procedure:
1.
Mode:
record
1.
Mode: playback
1 kHz, —20 dB (77.5 mV)
af ose
blank tape
P-4-L.81
(333 Hz, 0 dB)
VTVM
om ~y
—
unit \ |
speaker terminal
O
e600
2
MIC
Modys playback
3.
Mode:
record
rewound recorded
short-circuit plug
portion
empty cassette
VTVM
speaker terminal
MIC
Specification:
No signal input
+
_
i s e
|
1}
=S/N
reCdB)
s/
4.
Mode:
playback
recorded
portion
S/N
greater than 36 dB
Power source
ac adaptor
battery
greater than 42 dB
speaker terminal
7.
Wow and Flutter Measurement
recorded signal
VTVM reading
1 kHz
Adjust PB VOL control
(—20 dB, 77.5 mV) | for 0 dB (0.775 V)
Control/Switch Setting:
PB
VOL control: mechanical midway
less than —60 dB(0.78 m V)
no signal
(erase ratio greater than
60 dB)
Procedure:
1.
Mode: playback
WS-48
(3 kHz, 0dB)
lad aauer
O
MONITOR
Specification: less than 0.4 % (RMS)
Note: Measure
wow
and
flutter
for beginning,
midway and end portion of WS-48.
—~16—
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