Yamaha QL5 Service Manual page 134

QL5/QL1
1-10. WORD CLOCK Test
Contents Checks WORD CLOCK OUT → IN automatically
by counting it at PLLPU.
(Fs=44.1/48 kHz) Checks PLL LOCK by reading the
UNLOCK signal when the clock has been stabilized
after the Fs change (after about 200 ms).
Example of executing screen
Various Fs (frequencies) for the PLL LOCK check are generated
in Internal Clock of FPGA.
Fs = 44.1 kHz, 48 kHz
During the UNLOCK check, a message will appear indicating
to disconnect the WORD CLOCK cable as shown below. Then
disconnect the BNC cable.
134
1-11. AES/EBU(OUT) test
Contents Checks by the sound with the speaker connected.
Refer to the 128 page for a connection method.
Example of executing screen
Check if 1 kHz sine wave is heard from the speaker. If it is
heard, input OK and if not, input NG using the dialog box.
1-12. MIDI test
Contents Checks if the data output to the MIDI terminal and
the loopback data received are the same.
Refer to the 128 page for a connection method.
Example of executing screen