Testing The Buttons And Leds; Cpu Diagnostics; Rom Test ( R R R R O O O O M M M ); Eeprom Test ( E E E E E E E E R R R ) - Kurzweil sp88x User Manual

Troubleshooting
Diagnostics

Testing the Buttons and LEDs

When pressed, any button should show a unique number on the display. The number
should appear immediately when the button clicks down and should disappear
immediately when released. Flickering while down may indicate a problem with the
switch while a sluggish release is likely to be an alignment problem between the
button and the front panel hole.
The Sound/Setup Select buttons will also turn on their LEDs when pressed. Red and
green will show alternately each time pressed and the Þrst press should always show
red.
Press the Col Select and Row Select buttons together to exit this test mode.

CPU Diagnostics

This diagnostic group is second on the main diagnostic menu. It tests the controller
section of the Stage Piano. Most tests are for service technicians but the MIDI test can
be useful for checking MIDI cables.
As with the main menu, the Row Select button scrolls through the available
diagnostics and the Col Select button runs the current selection. When a diagnostic
runs, the display Þrst ßickers a couple of times then goes blank while the diagnostic
runs. When complete, the result, either p p p
can be immediately rerun by pressing Col Select again or the menu can be advanced
to the next diagnostic by pressing Row Select.
ROM Test (
This test calculates the checksum of the controller software code and compares it with
the correct value.
EEPROM Test (
This test Þrst veriÞes that a special test pattern is present in a reserved area of the
EEPROM. It then modiÞes that pattern and veriÞes that it can be read back. The
pattern is different each time it is run. Running this test does not harm user setup data
present in the EEPROM.

MIDI Test (

This will test the MIDI ports and whatever cable is used to connect them together.
Before starting the diagnostic, connect a MIDI cable directly from the MIDI In port to
the MIDI Out port on the rear panel.
CAUTION: Use this diagnostic only for testing cables. The non-MIDI data used for testing
may crash other devices like merge boxes and routers.
Timers Test (
This tests the hardware timers used by the controller software.
7-8
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r o o r r r o m m o m m
)
e e e e e r r e r r
e e
)
m i i m i d d i d d
m m
)
t i i t i m m i m m
t t
p a a a a s s s s or f f f f a a a a l l l l , is displayed. The diagnostic