Printhead/Cpu Board Mismatch - Intermec EasyCoder 501 Service Manual

26.1 Printer "Dead",
cont.
Cut Pin #15
Intermec EasyCoder 501 – Service Manual Ed. 7
CPU Board failure, cont.
If you have run the aforementioned diagnosis tests and a visual
•
inspection of the board does not reveal anything abnormal, it
could be that the user program has somehow got stuck, that is,
the RAM memory is overfl owed or contains meaningless data.
An easy way to clear all RAM memory, including saved pro-
grams, is to enter the Service part of the Setup Mode by means
of a special password (491601) instead of the normal password
(1138). This action will clear all RAM memory and set all
parameters to their default values.
If, for some reason, you cannot enter the Setup Mode, the
memory can be cleared simply by removing and refi tting the
RAM packages.

Printhead/CPU Board mismatch

Printer refuses to start up after a printhead replacement. The
•
reason may be that the combination of one type of 8 dots/mm
printhead (Part No. 1-010010-93) and the "old" CPU board
(Part No. 1-040700-28) causes an electrical mismatch that will
prevent the printer from starting up. Such CPU boards were
installed in EasyCoder 501 printers manufactured before Sep-
tember 30, 1996.
CPU boards with Part No. 1-040700-29 or later in combina-
tion with 8 dots/mm printheads with Part No. 1-01010-91 or
with any 12 dots/mm printheads do not cause this problem.
The problem is easy to fi x. First make sure that the printhead
really is of the type 1-010010-93 and that the CPU board really
is of the type 1-040700-28. If only one of these two conditions
is fulfi lled, do not cut the line.
Printhead 1-010010-93 has a metal cover protecting its cir-
cuitry (not plastic) and the lower lip on the front of the adapter
plate is removed, see Chapter 8.7.
Issue a Fingerprint instruction to read the version of the CPU
board:
PRINT VERSION$(2) ↵
If #3 is returned, you have CPU board 1-040700-28. If any
other value is returned, you have another type of CPU board.
If you cannot issue any Fingerprint instructions, remove the
left-hand cover and read the number at the top center of the
CPU board. If this number is 040700-01, you have CPU board
1-040700-28.
Cut off pin 15 on the replacement printhead. Compare with the
picture and make sure that you cut the correct pin (third from
the right in the upper row when viewing the connector's back
side).
Chapter 26 Troubleshooting
201