Yamaha CDR1000 Service Manual page 23

D9 WORD CLOCK
Input a 1 kHz, full-scale signal into the AES/EBS IN, and a 44.1 kHz word clock intothe WORD CLOCK terminal, check
that a 1 kHz, full-scale signal is output from AES/EBS OUT.
D10 AES/EBU THRU
Input a 1 kHz, full-scale signal into AES/EBS IN, check that a 1 kHz, full-scale signal is output from AES/EBS OUT.
D11 DSP and DRAM
Input a 1 kHz, full-scale signal into AES/EBS IN, check that a signal is output from AES/EBS OUT about 2 seconds later.
D12 SEARCH
Load a music CD into the drive unit.
Check that the sound of the CD being fast forwarded is output from ANALOG OUT L and R and that the meter responds
correctly.
After the above check, press the [NEXT] key; the display will appear as shown below and testing will end.
DIAG END
Exit the TEST mode
Turn off the power switch then turn on again.
Pressing the SW1 on the MAIN circuit board will set to regular mode.
INSPECTION
Load a test CD (ALMEDIO TCD-784) into the drive unit.
1. Playback Level & Frequency Response
Playback the second trac (1 kHz), the third trac (20 Hz) and the sixth trac (20 kHz) on the test CD, and check that the
output level at ANALOG OUT L and R is within the range of +18.5 dBm +1/-2 dB. Also check that a 1 kHz, full-scale
signal is output from COAXIAL OUT, AES/EBS OUT respectively.
2. Playback Distortion Factor
Playback the second trac (1 kHz) on the test CD, and check that the distortion factor measured at ANALOG OUT L and
R is less than 0.03%.
3. Playback Residual Noise
Play back the seventh trac (no sound) on the test CD, and check that the residual noise measured at ANALOG OUT L and
R is less than -77 dBm.
4. Emphasis
Using the output level obtained at ANALOG OUT L and R when the second trac (1 kHz EMP:OFF) on the test CD is played
back at 0 dB, check that the level obtained when the twelfth trac (5 kHz EMP:ON) is played back is -4.53 dB ± 1 dB.
Load a CD-RW disk (TDK CD-RW XA74) into the drive unit to inspect the following items.
5. Recording Playback Level & Frequency Response
Select ANALOG from the INPUT SELECT switch and press the REC key. (REC stand-by state)Input the signals of the
frequencies and levels in the following table into ANALOG IN and check that the output of the specified level is obtained
at ANALOG OUT L and R as well as COAXIAL OUT, AES/EBS OUT.
INPUT
ANALOG OUT
FREQ LEVEL
20 Hz 0 dBm +10 dBm +1/-2dB FULL-SCALE,-8.5 +/- 1dB
↓
1 kHz
↓
1 kHz
COAXIAL OUT
OUT L,R AES/EBS OUT
↓ ↓
↓ ↓
CDR1000
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