Service manual

REC 3829 4-11
Memory Lost
Enter All Values
4. Procedure complete. Press RUN to re-enter the required setup information
which is machine prompted. See Section 3.5, Initial Setup Procedure, for
required entries.
4.4 TROUBLESHOOTING
The troubleshooting procedures are listed in a logical sequence in Table 4-1 to enable
maintenance personnel to make the fastest checks first. Refer to the listed symptoms
and proceed to isolate the possible cause of the failure and apply the recommended
corrective action. When the solution recommends replacement of a component or
assembly, refer to the Replaceable Parts in Chapter 5.0. Other section references are
provided where necessary. If the procedures recommended do not provide a solution to
your particular problem, contact Thermo Products Technical Service for assistance.
TABLE 4-1
TROUBLESHOOTING PROCEDURES
SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
Front panel displays
blank; no lamps lit,
no keyboard
response.
Incorrect DC voltage
Bad Display
Perform power supply
troubleshooting procedures, refer to
Table 4-2.
Replace defective Display Module,
refer to Display Module Replacement
Procedures in this chapter.
Front panel display
blank or blinking
randomly; no display
response to lamp test
but LED's OK.
Incorrect DC voltage
Bad Display Board or
cable
If problem persists
Perform power supply
troubleshooting procedures, refer to
Table 4-2.
Replace defective Display Module,
refer to Display Module Replacement
Procedures in this chapter.
Replace defective Analog Board,
refer to Analog Board Replacement
Procedures in this chapter.
No response when
one or more keys are
pressed; i.e., some
work and some don't.
Bad front panel
If problem persists
Replace defective front panel, refer
to Front Panel Replacement
Procedures in this chapter.
Replace defective Analog Board,
refer to Analog Board Replacement
Procedures in this chapter.
Message "A/D Under
Ranged"
Input from loadcell is
zero or less.
Check for objects between loadcell
and weightable.