Zram; Midi; Led; Pcx-1 Rom - Kurzweil PC2 Series Service Manual

ZRAM

This test performs a quick read-write of the internal RAM and verifies that the data was
successfully written and retained.
A failure of this test may indicate a problem with the RAM or the Engine Board.

MIDI

The MIDI test performs a loop-back of the serial port by sending a 23-byte pattern over the
external MIDI link. This test requires a MIDI loop (a MIDI cable that connects two MIDI jacks).
The test will fail if a MIDI cable is not connected between two MIDI jacks. Be sure to run this test
with MIDI cables connected as follows:
Note: Be sure to use a known working MIDI cable!
1. Connect a MIDI cable to the MIDI In and MIDI out jacks and run the test.
2. Connect a MIDI cable to the MIDI In and MIDI Out/Thru jack and set the Out/Thru
switch on the rear panel to Out. Run the test.
A failure of this test could be caused by failure of the serial port, other MIDI circuitry, or a
problem on the Connector Board or the Engine Board.

LED

This test lights all the front panel LEDs. To complete the test and obtain the test result, press the
Cancel button. When the Cancel button is pressed the LEDs shut off and the test result is shown.
A failure of this test may indicate a problem with the Front Panel Board(s), related circuitry or
the Connector Board.

PCX-1 ROM

This test checks the software data (engine, boot, and setups) stored in FlashROM on the PCX-1
Board.
Failure of this test may indicate a problem with the Flash ROM chip (U5 on the PCX-1 Board),
associated circuitry, or the PCX-1 Board.
PCX-1 RW
This test is a combination of the RAM, MABEL and LISA tests. This test writes data to RAM and
the MABEL and LISA registers then confirms that the data written can be read back successfully.
A failure of this test indicates a problem with the PCX-1 Board.

PCX-1 RAM

The PCX-1 RAM test writes to the microprocessor RAM space and verifies that the write was
successful.
A failure of this test may indicate a problem with the RAM or related circuitry on the PCX-1
Board.
Diagnostics
Description of Tests
2-5