Yamaha AD8HR Service Manual page 35

[5] PLL test
[6] ATSC2 test
[7] DSP7 test
[8] DIT A test
[9] DIT B test
[10] DIR test
Start HyperTerminal. (Settings are as described above.)
Press ESC key on the keyboard of PC.
Turning on the power while holding down the channel select button "3" and "8" switches the AD8HR to the test program.
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Check automatically whether to set BNC IN to LOCK when performing the loop-back test of BNC OUT -> BNC IN.
Center frequency 4 point + vari pitch upper/lower limit 4 point
Read Fs counter for PLLP2.
Sets Write/Read on the ATSC2 register and automatically tests the pass/fail of the data bus and address bus.
Sets Write/Read on the DSP7 register and automatically tests the pass/fail of the data bus and address bus.
Tests the send/receive signal on the SO -> ATSC2 connection of DSP7.
Makes a 4 line serial check with the AK4101 register.
Makes a 4 line serial check with the AK4101 register.
1. Makes a 4 line serial check with the CS8415 register.
2. Makes loop-back tests on DIGITAL OUT A CH1/2 OUT -> CH1/2 IN the same as the PLL test, automatically
testing whether to set AES/EBU IN to LOCK.
This test will be skipped. If the loop-back test jig is prepared, then you can test it with the following processes.
Loop-back test jig
13
25
D-SUB 25P Male Connector
Interconnection
Diagram
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5
18 14
Loop-back test jig
WORD
CLOCK
DIGITAL OUT A IN OUT
HA REMOTE 1
AD8HR
1 5 short
1
14 18 short
Serial
Cross Cable
COM
AD8HR
PC
35