STP 120 Tissue Processor - Service Manual
Page 17
This message appears on the display when the unit does not detect a
signal from one of the temperature probes (sensors) in the paraffin
baths. (In the example, probe 11).
Before starting the unit using the switch on the rear, make sure
that all the connectors are inserted in the two paraffin baths (or
three, depending on the version), as the unit runs a check for the
presence of these signals on start-up.
Procedure:
1. Turn off the unit using the main ON/OFF switch
2. Insert the connectors for the paraffin baths in their corresponding
bases.
3. Turn the unit on using the main ON/OFF switch.
Once the self-check is completed, press the DOWN key to display the
temperature values of the different paraffin baths.
If any of these values is 280 °C, this could mean that there is a fault in:
•
The temperature probe of the bath
•
The BASCAR V15 circuit board
•
The MICCAR V30 circuit board
Check by elimination:
Before proceeding with any measurements, determine by elimination
whether the failure is the bath or the control electronics.
If, for example, the error message indicates that it refers to probe 12,
proceed as follows:
1. Turn off the unit
2. Invert the connectors to baths 11 and 12
3. Re-start the unit.
As the paraffin baths are identical, the origin of the failure can be
determined from the message on the display:
•
If the message still indicates that the error has occurred in probe 12,
it is very probable that the error is caused by the control electronics.
Refer to the procedure for placing the unit in dismantling position
(page 9) and replace the BASCAR V15 circuit board. If the unit still
fails to operate, replace the MICCAR V30 circuit board as described
on page 10.
•
If the message now indicates that the error is in probe 11, it is
almost sure that the fault is in the temperature detector of the bath
that was previously bath 12.
