Yamaha ACU16-C Service Manual page 36

ACU16-C
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4. Testing of MAIN circuit board
4.1 Connection
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Set SW201 of the MAIN circuit board to "0".
Using the USB cable, connect CN308 of the MAIN circuit board and the USB terminal of PC.
Using the serial cable (cross), connect CN602 of the DAC-JACK circuit board and the serial terminal of PC.
4.2 Testing
Select "6. ACU16-C MAIN SHEET" on the start-up screen of the TEST program, and testing of test items is automatically
executed in the order of the following test items.
1 FLA: READ/WRITE test of FLASH ROM
2 RAM: READ/WRITE test of FLASH ROM
3 EEP: READ/WRITE test of DRAM
4 DSP: READ/WRITE test of DSP5 register
5 CM1: READ/WRITE test of CM-1 HM1
6 COB: Serial LOOP BACK test of CM-1
7 USB: USB test
8 WCK: Word clock test
9 ROT: UNIT ID select SW test
Turn the SW201 switch of the MAIN circuit board clockwise according to the instruction on the PC screen.
Testing of following test items is executed when the "ENTER" key of the keyboard is pressed.
10 LED : LED lighting test
Check that LED's on the DAC-LED circuit board light up in the order of [LD801] → [LD803] → [LD804] and then all
three of them simultaneously.
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DAC-DAC2 DAC-DAC1
(V905060) (V905050)
CN501 CN401 CN301 CN201
CN603
CN604
CN308
MAIN circuit board (V899900) to be tested
Windows
PC
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Automatic judgment
Automatic judgment
Automatic judgment
Automatic judgment
Automatic judgment
Automatic judgment
Automatic judgment
Automatic judgment
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CN602
DAC-JACK
(V905070)
CN601
CM-1(V981120)
POWER
CN403 CN402
SUPPLY
(V970290)
CN301
CN51
CN801
DAC-LED (V983590)
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