Yamaha DTXPRESS, Service Manual, Page: 20 / 47

20
DTXPRESS
Test End
OK: It proceeds to the next test automatically.
T–39. OUTPUT R 1kHz
Initial Display
39 OUTPUT L 1kHz
This test checks the OUTPUT (R) for the specified signal
output level.
Insert the plugs into the OUTPUT (L/MONO and R). Set
the MASTER volume to maximum and AUX IN volume
to minimum. Use the frequency counter, oscilloscope,
distortion meter and level meter (with flat filter) to
measure frequency, waveform, distortion and output level.
Check that the AUX IN jack is unplugged and that the
input voltage is less than -90 dBm.
Check points
Check that the output meets the following specifications:
OUTPUT (L/MONO):
Less than -65 dBm (w/ flat filter)
OUTPUT (R):
1 kHz +/-3 Hz, sine wave, +0.6 +/-2 dBm (10 kohm
lord and distortion is less than 0.3 %)
OUTPUT (R):
Less than -65 dBm (w/ flat filter)
Test End
OK: It proceeds to the next test automatically.
T–40. OUTPUT L 10kHz
Initial Display
40 OUTPUT L 10kHz
This test checks the OUTPUT (L/MONO) for the specified
signal output level.
Insert the plugs into the OUTPUT (L/MONO and R). Set
the MASTER volume to maximum and AUX IN volume
to minimum. Use the frequency counter, oscilloscope,
distortion meter and level meter (with flat filter) to
measure frequency, waveform, distortion and output level.
In the AUX IN, check that the plug is not inserted, and the
input voltage is less than -90 dBm.
Check points
OUTPUT(L/MONO):
10 kHz +/-3 Hz, sine wave, +3.0 +/-2 dBm (10 kohm
lord and distortion is less than 0.3 %)
Test End
OK: It proceeds to the next test automatically.
T–41. OUTPUT R 10kHz
Initial Display
41 OUTPUT R 10kHz
This test checks the OUTPUT (R) for the specified signal
output level.
Insert the plugs into the OUTPUT (L/MONO and R). Set
the MASTER volume to maximum and AUX IN volume
to minimum. Use the frequency counter, oscilloscope,
distortion meter and level meter (with flat filter) to
measure frequency, waveform, distortion and output level.
In the AUX IN, check that the plug is not inserted, and the
input voltage is less than -90 dBm.
Check points
OUTPUT(L/MONO):
10 kHz +/-3 Hz, sine wave, +3.0 +/-2 dBm (10 kohm lord
and distortion is less than 0.3 %)
Test End
OK: It proceeds to the next test automatically.
T–42. OUTPUT L 50Hz
Initial Display
42 OUTPUT L 50Hz
This test checks the OUTPUT (R) for the specified signal
output level.
Insert the plugs into the OUTPUT (L/MONO and R) jacks.
Set the MASTER volume to maximum and AUX IN
volume to minimum. Use the frequency counter,
oscilloscope, distortion meter and level meter (with flat
filter) to measure frequency, waveform, distortion and
output level.
Check that the AUX IN jack is unplugged and that the
input voltage is less than -90 dBm.
Check points
OUTPUT(L/MONO):
50 Hz +/-3 Hz, sine wave, +2.7 +/-2 dBm (10 kohm
lord and distortion is less than 0.3 %)
Test End
OK: It proceeds to the next test automatically.
T–43. OUTPUT R 50Hz
Initial Display
43 OUTPUT R 50Hz