Kurzweil K250 - Diagnostics Introduction and Setup

4.1 - INTRODUCTION TO DIAGNOSTICS
Revision B Diagnostic EPROMs are for use with Kurzweil 250
and Kurzweil 250X units with Vergion· 2.2 or earlier software
installed. If the instrument you are testing has software later than
Version 2.2
installed, you should test it with Revision D Diagnostics.
Revision B Diagnostic EPROMs are
in 128K EPROMs. If you are
testing a Kurzweil 250X, you will need Revision B Diagnostic EPROMs
in 256K EPROM.
4.2 - INSTALLING DIAGNOSTIC EPROMS
1. Turn off system power
2. Open the slide chassis.
3. Remove U38 and U54 from the CPU board. Be careful
when removing these EPROMs as you will be reinstalling
them when the testing is complete.
4. Install U38 (Loc. 01) and U54 (Loc. 02) Diagnostic EPROMs
in the empty sockets on the CPU board.
NOTE: When installing the diagnostic EPROMs, be sure
pin 1 is facing the rear panel.
5. Turn on system power
NOTE: When the system is first turned on, the front panel
LEOs may come on in an unpredictable pattern. They should
all turn off after about one second.
6. The red power indicator light on the POD should be on. The
front panel
LCD should indicate:
K250 DIAGNOSTICS (C)
REV. B 24-JAN-85
The SELECT switch LED should be blinking on and off.
Kurzwell 250 Service Manual, Chapter 4
4-2
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