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QQ
3 7 63 1515 0
CH1
RF SWP
OK
CH2
NG
Fig. 7-3-5.
2. Frequency Responce Check
Purpose:
Confirm that the frequency characteristic is within the specifica-
tion.
Mode
Signal
Measurement point
Measurement equipment
Specified value
TE
L 13942296513
Note: Tape path adjustment must have been completed.
Confirmation Method:
1) Supply a signal of 400 Hz, –7.5 dBs to both L and R channels
of Audio Line Input.
2) Connect the audio level meter to the Audio Line Output.
3) Adjust the attenuator so that the audio level meter will indi-
cate –7.5 dBs.
4) Make recording.
5) Set an audio line input signal to 20 Hz and make recording.
6) Set an audio line input signal to 20 kHz and make recording.
7) Playback a recorded portion, and measure output levels at 400
Hz and 20 Hz and 20 kHz.
8) Confirm that the 20 Hz and 20 kHz playback output level within
a range of the 400 Hz playback output level 0 ± 2 dB.
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.
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REC and PB (SP, EP mode)
400 Hz, –7.5 dBs
20 Hz, –7.5 dBs
20 kHz, –7.5 dBs
Audio output terminal
Audio level meter
0 ± 2 dB
x
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i
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2 9
8
3. Overall Level Characteristic and Distortion Factor
Check
Purpose:
Check the record level, play level, and distortion factor against the
reference input.
Mode
Signal
Measurement point
Measurement equipment
Specified value
Confirmation Method:
1) Supply an audio signal of 400 Hz, –7.5 dBs simultaneously to
both L and R channels of Audio Line Input.
2) Make recording
3) Play back a recorded portion.
4) Confirm that a playback level is –7.5 ±2 dBs.
5) Confirm that a distortion factor is within 1%.
4. Overall S/N Check
Purpose:
Confirm that the S/N is within the specification.
Mode
Signal
Q Q
Measurement point
3
6 7
1 3
1 5
Measurement equipment
Specified value
Confirmation Method:
1) Connect both L and R channels of audio line input to the GND.
2) Start recording.
3) Play the recorded part to confirm that the noise is below –67.5
dBs.
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.
7-4
9 4
2 8
REC and PB (SP mode)
400 Hz, –7.5 dBs
Audio output terminal
Audio level meter and
distortion factor meter
Playback level: –7.5 ± 2 dBs
Distortion factor: 1% or less
REC and PB (SP mode)
Short
Audio output terminal
0 5
8
2 9
9 4
2 8
Audio noise meter
–67.5 dBs or less
m
9 9
9 9
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