PianoDisc HD - Driver board lights flashing; Data Cable and Board Diagnosis; System powers up but wont play; Power Supply and Driver Board Voltage

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2. Driver board lights are flashing

This problem can be a bad data cable (RJ-45), poor plug connection or bad driver

board. The process is to replace data cables one at a time until you find the bad cable.

The problem also can be a bad driver board which can cause the two other boards to

flash also.

1. Turn off power. (Replace data cables one at a time.)

2. Replace data cable (RJ-45) from CPU to bass driver board.

3. Then replace data cables between each of the driver boards.

4. If the lights are still flashing, then unplug data cable from bass board and plug into the

middle board, if the middle and treble boards test ok, then the bass board is bad. Basically

you are checking each board position. All driver boards are the same and automatically

switch for that position and this could be the problem.

3. System powers up but will not play

(driver board lights on and not flashing)

1. Press the test button on the CPU.

• If it plays then it is probably a wireless communication problem. Go to step 7.

2. Check the small power supply voltage, unplug power cable at the CPU, it should read 12

VDC. (See picture on previous page)

• If the power supply read 8 volt or less the system will not play and the power supply

is bad. The best way to check is under a load using the data test cable on the treble

driver board. (See picture below)

3. Check the large power supply voltage at the power supply, it should read a about 48

VDC. While playing the piano the voltage will range between 39-42 VDC.

4. Use a data test cable and check voltage out of the CPU, should have about 12

VDC.

5. Using the data test cable, plug into the end of the treble driver board and check

voltage, should have 10-11 VDC, there is always some line loss. If the voltage is

8 volts or below, check the voltage at the tenor driver board and the bass board if

still low. The problem is one of the driver boards can have a internal grounding

problem which causes nothing to play. Replace the bad driver board.

Checking voltage out of CPU Checking power out of key driver board