Test Program - Yamaha AO8 Service Manual

(1) Fs = 51.12 kHz (48 kHz + 6.5 %)
· Set the function generator to 51.12 kHz.
· Test listen for 30 seconds at all the output terminals and verify that there is no noise.
(2) Fs = 39.69 kHz (44.1 kHz -10 %)
· Set the function generator to 39.69 kHz.
· Test listen for 30 seconds at all the output terminals and verify that there is no noise.
3-5. Firmware Load Test
Check that it is possible to load the firmware as in 2-2. using the Input B terminal.
3-6. Inspects word clock output of INPUT A, B
In the test program performed in 3-1, use the oscilloscope to monitor Pin 5 of IC101 of sheet IPC for output A of A18 that is
being used as a jig using the timing shown below. Confirm that 44.1 kHz word clock is being output.
(It is good if the wave form like the one shown in Figure 1 appears.)
1 Observe at the time of completing the inspection of Port A of the AO8-IPC 2 Test.
2 Observe at the time of completing the inspection of Port B of the AO8-IPC 2 Test.
4. Factory Settings
· Switch all the sheet UNC DIP switch settings On.
· Front panel
INPUT SELECTOR:
· Rear panel
WORD CLOCK IN 75 Ω:
GND
Frequency range
(44.098kHz~44.102kHz)
( Figure 1 )
A
On
Voltage range
(3.8V~5.2V)
AO8
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