325P620 Rev7
(3255 Service Manual)
Page 3 of 4
in the upper left corner. Reinstall two
screws, if applicable.
7. Reconnect all wiring connections and
proceed to the REASSEMBLE AND
CHECKOUT instruction, below.
Processor Board (smaller of two)
Replacement:
1. Remove the processor board (smaller of
two) by first releasing the two plastic
standoffs at locations E3 and E4 (B).
Next, gently pry the processor board off
its J1 and J2 connectors (C) by rocking it
from top to bottom.
2. Remove the replacement processor board
from its anti-static bag, taking care not to
disturb the options/configuration switch
SW1 (A).
3. Install the new processor board onto the
new application board by reversing step
1, being careful to firmly seat the J1 and
J2 connections.
4. Proceed to the REASSEMBLE AND
CHECKOUT instruction, below.
REASSEMBLE AND CHECKOUT
1. Verify that all wiring connections have
been restored, and that they are not offset
on the mating board’s connector.
2. Remove the static ground strap and put
aside until checkout is complete.
3. Replace the cover, taking care not to
pinch any wiring.
4, Verify that the power switch is OFF, and
then plug in the power cord.
5. Turn on the instrument and verify that the
instrument boots up correctly by watch-
ing the display and/or printout.
If you replaced the board set, processor
board, or an older single control board
configuration, you will need to enter your
configuration settings and recalibrate
your instrument (next step).
If you are using the original processor
board (application board replacement),
you will not need to reenter any settings
and may skip to step 8.
6. Use the SETUP menu to reset the sample
and block probe bin numbers and the
sample stir amplitude, and any other cus-
tomized settings.
Note: If values are unavailable, refer to the
User’s Guide for setup procedures.
7. Reset the serial number (see the follow-
ing procedure).
8. Press STOP to exit the Setup menu. The
instrument will run the self-diagnostics
program.
9. Recalibrate the instrument. For further
information, refer to your User’s Guide.
Reset Serial Number
1. Locate a Supervisor/Operator keyswitch,
turn it to the Supervisor position (if
required).
2. At “Press START to Continue”, press
SETUP.
3. Cycle through the menu options by press-
ing < or > until you reach “Serial
Number”, and then press START. The
display will read “Serial#:********”.
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