Pc88 Internal Diagnostics; Entering Diagnostics; Running The Debug Sequence - Kurzweil PC88 Musician's Manual

Appendix G

PC88 Internal Diagnostics

This appendix contains instructions on (1) how to use the PC88Õs internal diagnostics to test the
unit and (2) how to perform a hard reset. Be sure to read all of the following instructions
before using the diagnostics. Otherwise, damage to external equipment may occur.

Entering Diagnostics

To start the PC88 diagnostics, power up the unit while simultaneously holding the 1 , 2 , and 3
buttons. Release the 1 , 2 , and 3 buttons within two seconds of turning on the PC88. After a brief
introductory message, the display will appear as follows:
Press <<< to Reset
Press >>> for Diags
At this point, you can do one of three things:
1.
RAM has been erased.
Cycle the power now.
2.
3.

Running the Debug Sequence

If you pressed the >>> button in step 2 above, the following will appear in the display:
Menu
Before continuing, set the PC88Õs volume slider to its minimum setting. Some tests produce
loud, potentially destructive test tones. When these tones begin to sound, if you wish, you can
adjust the volume slider to hear them.
Press the Zone 3 button. This will run all of the available tests in sequence, displaying the
name of each as it executes. After each test Þnishes, the LCD will show Pass or Fail in the upper,
right-hand corner. You must press any button (or keyboard key) to continue with the next test
in the sequence.
Three tests in the sequence require special treatment: the MIDI UART Test , the VGM Port Test ,
and the Sound Test . The MIDI UART Test requires that a MIDI cable be connected between the
MIDI Out and MIDI In connectors on the back of the unit. If this MIDI cable is not installed, the
Press the <<< button, which will erase the non-volatile memory. Any user sounds or
setups in the instrument will be lost! The following message will be displayed:
After this message appears, remove power from the unit. When power is re-applied, the
non-volatile memory will be reset.
Press the >>> button, which will enter diagnostics. Note that some diagnostic tests
destroy the RAM; therefore, anything stored in the non-volatile memory will be lost!
Remove power from the instrument. This is the only way to guarantee that user sounds
and setups stored in the non-volatile RAM will be retained.
CPU Test
PC88 Internal Diagnostics
G-1