Yamaha CDR1000 Service Manual page 24

CDR1000
6. Recording Playback Distortion Factor
Select ANALOG from the INPUT SELECT switch and press the REC key (REC stand-by state).
Input a 1 kHz, +8 dB signal into ANALOG IN L and R and check that the distortion factor at ANALOG OUT L and R is
less than 0.03%.
7. Recording Playback Residual Noise
Select ANALOG from the INPUT SELECT switch and press the REC key (REC stand-by state).
Connect a 150 ohm resistor to the 2-3 pins of ANALOG IN L and R and check that the residual noise at ANALOG OUT L
and R is less than -73 dBm.
8. Headphone Output Level, Distortion Factor
Select ANALOG from the INPUT SELECT switch and press the REC key (REC stand-by state).
Input a 1 kHz, 0 dB signal into ANALOG IN L and R and check that the output level at PHONES OUT, L and R is +3 dBm
± 2 dB.
Also, vary the input level of ANALOG IN L and R so as to obtain the +8 dBm ± 1 dB (100W output power) at PHONES
OUT L and R and check that the distortion factor is less than 5%.
9. Digital Input Level
Select COAXIAL from the INPUT SELECT switch and press the REC key (REC stand-by state).
Input a 1 kHz, full-scale signal into COAXIAL IN and check that +18.5 dBm ± 1 dB signal is output from ANALOG OUT
L and R.
Also, input a 1 kHz, full-scale signal into AES/EBS IN and check that a +18.5 dBm ± 1 dB signal is output from ANALOG
OUT L and R.
10. Recording check
Select ANALOG from the INPUT SELECT switch.
Press the AUTO button, and then press the REC button (AUTO REC START mode).
Input 1 kHz, 0 dBm signals into the ANALOG IN L and R to record them on the CD-RW disk.
Playback the recorded signals to check that the recording has been made properly.
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