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3-17. Sync crosstalk measurement
Sync crosstalk is a relative figure against the reference level, on how much of the recording signal from a track in
recording mode is leaking into the track being reproduced. When sync crosstalk is excessively high, playback output
during overdubbing will sound muddy by effect of the recording signal leakage or cause oscillation at pingpong
recording (where the playback output is transferred to another track).
1)
Set the controls as follow and put a blank tape to the transport.
Trim knob: At minimum
Input fader: Standard position (At 8 ± 1)
Dolby B noise reduction on/off switch: OFF
2)
Apply a signal whose level is -10 dBV (0.3 V).
3)
Put one track into REC mode and check if the level at TAPE OUT on an adjacent track is within the specifications
listed below when sweeping the oscillator frequency.
At 1 kHz:
1 ~ 20 kHz:
3-18. S/N Measurement
3-18-1. Reproduce
1)
Set the control as follow.
Dolby B noise reduction on/off switch: OFF
2)
Connect an AC volt meter and put the transport into PLAY mode without loading a tape.
3)
Check if the AC volt meter reading is within the following specifications.
DIN AUDIO: 47 dB
IHF-A:
3-18-2. Record and reproduce (Overall)
1)
Set the control as follow.
Dolby B noise reduction on/off switch: OFF
2)
Put a blank cassette tape and start recording without applying a signal.
3)
Rewind the tape to the start point and play it back.
4)
Check if the AC volt meter reading is within the following specifications.
DIN AUDIO: 45 dB
IHF-A:
5)
Next, turn the Dolby switch on and repeat the above procedures 2) ~ 4).
6)
Check if the AC volt meter reading is within the following specifications.
DIN AUDIO: 48 dB
IHF-A:
3-19. Click Noise Measurement
3-19-1. Dolby switch on/off
1)
Check if the click noise level at TAPE OUT when turning on/off the Dolby switch is less than -30 dBV
3-19-2. REC/STOP (monitor)
1)
Check if the click noise level at TAPE OUT when punching out by pressing the STOP button is less than -20 dBV
3-19-3. REC/STOP (on tape)
1)
Turn off the Dolby switch, turn on all the 1 ~ 4 record track switches and put a blank cassette tape in the transport.
2)
Plug the foot switch (e.g. Model 8051) in the Punch in/out jack and press the PLAY button.
3)
Press the foot switch repeatedly and check if the click level at TAPE OUT 1 ~ 4 is less than -20 dBV
-25 dBV or less
-10 dBV or less
55 dB
48 dB
55 dB
X-24
.
p-p
.
p-p
.
p-p
13
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