The next prompt after the
RAM
tests is:
TEST CPU ROM? Press YES
ALL
CPU ROM? Press YES
The CHECKSUM for each EPROM will be displayed on the LCD.
The CHECKSUMs are for the following EPROMs:
U38 (DIAGNOSTIC
EPROM)
U54 (DIAGNOSTIC
EPROM)
U37
U53
U36
U52
U35
U51
U26
U41
U25
U40
NOTE: THE CHECKSUMS
FOR
THE EPROMS ARE DISPLAYED AND
SHOULD
BE
COMPARED
WITH
THE
CHECKSUMS LOCATED
ON
EACH
EPROM
LABEL.
The 8254 timers are the next CPU components checked. The
outputs of the timers are Pins
10, 13 and 17. The prompt is:
INIT TIMERS? Press YES
Kurzwell
250
Service Manual, Chapter 4
4·42
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