Kurzweil K2600 Series, Service Manual

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2-6
Diagnostics
Description of Tests
FDD Init (Floppy Disk Drive Initialize)
Note : Insert a blank formatted disk into the fl oppy disk drive before running this test!
The FDD Init test recalibrates the disk drive.
A failure of this test may indicate a problem with the connection between the fl oppy drive and
the Engine Board, the fl oppy drive, or fl oppy drive’s controller (U9 on the Engine Board).
Scanner
This test lights sequentially the LEDs for the eight mode select buttons:
Program, Setup, Q Access, Effects, MIDI, Master, Song, and Disk
This test con fi rms scanner communications by sending data to the scanner, 37451, (U1 on the
Scanner Board-keyboard units and on the Front Panel/Scan Board-rack units). After processing
the data, the scanner sends a result back to the main processor (U3 on the Engine Board). If the
returned value is not as expected or if the scanner does not reply as expected, the test fails.
Failure of this test indicates a failure of the main processor or the scanner. Note that failed
scanner communications will likely disable operating the diagnostics from the control panel,
since control panel signals must be read and written through the scanner.
MIDI Uart
The MIDI Uart 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 functional 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.
Failure of this test could be caused by failure of the serial port, other MIDI circuitry, or a problem
on the Engine or DSP Board.
FDD R/W (Floppy Disk Drive Read/Write)
Note : Insert a blank formatted disk into the fl oppy disk drive before running this test! Be sure to
insert a blank disk; any data on the disk will be lost and could cause this test to fail.
This test initializes the fl oppy disk drive and performs a write/read test of the disk in the drive.
If this test fails, check the cable connections from the fl oppy disk drive to the Engine Board.
Failure of this test may indicate a problem with the fl oppy disk drive, the fl oppy drive’s
controller (U9 on the Engine Board), or related circuitry.