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Electrical Performance
Measurement
Items
conditions
:Mode
Adjustment of
recording bias
Playback mode
current
Recording mode
(Reference
:Test tape
Value)
TDK-D60
:Measurement
output terminal
Both recording and
headphone
terminals
Adjustment of
:Reference frequency
recording and
1KHz and 8KHz
playback
(REF.:- 10dB)
frequency
characteristics
:Test tape
TDK-D60
:Measurement
input terminal
OSC IN
Reference Values for Electrical Function Confirmation Items
Measurement
Items
conditions
Recording
Playback
bias
:Test tape
frequency
TDK-D60
:Measurement
terminal
BIAS TP on
P.C. board
1 With the recording and playback
mechanism, load the test tapes
TDK-D60, and set the mechanism to the
recording and pausing condition in advance.
2 After connecting 100
recorder head, measure the bias current
with a valve voltmeter at both of the
terminals.
1 With the recording and playback
mechanism, load the test tapes (TDK-D60)
and set the mechanism to the
recording and pausing condition in
advance.
2 While repetitively inputting the reference
frequency signal of 1KHz and 8KHz from
OSC IN, record and playback the tape.
3 While receding and playback the test tape
Lch and Rch so that the output
deviation between 1KHz and 8KHz
becomes -1dB +/-2dB.
Measurement method
1 While changing over to and form BIAS 1
and 2, confirm that the frequency is
changed.
2 With the recording and playback
mechanism, load the test tape.
(TDK-D60), and set the mechanism to the
recording and pausing condition in advance.
3 Confirm that the BIAS TP frequency on the
P.C. board is 62KHz +/-6KHz.
2 – 4
Standard
Values
TDK-D60
4.5
+/-0.5 A
in series to the
Output
deviation
between
1KHz and
8KHz
:-1dB +/-2dB
Standard
Values
62KHz
+/-6KHz
QT-MP3W
Adjusting
positions
A
Adjusting
positions
T201
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