2-3
CHAPTER 2 DIAGNOSIS
SYMPTOM
Scale does not respond to front
panel controls.
TABLE 2-3 SCALE DOES NOT RESPOND TO FRONT PANEL CONTROLS.
PROBABLE CAUSE
Membrane Switch is defec-
tive.
REMEDY
Refer to Section 3.2 and test the Mem-
brane switch. Replace if necessary.
See Repair Procedure 4.2. If membrane
switches are OK, refer to Section 3.4
and test the Main PC Board. If defec-
tive, replace the Main PC Board. See
Repair Procedures 4.3. After repair,
proceed with Performance Tests in Sec-
tion 3.6.
TABLE 2-4 NO DISPLAY OR PARTIAL DISPLAY.
SYMPTOM
Display is not on or partial char-
acters are displayed.
PROBABLE CAUSE
Display PC Board is defec-
tive or LCD may be defective.
NOTE
: If the LCD shows signs
of damage such as cracked,
dim or partial characters, the
LCD should be replaced
REMEDY
The Display PC Board is replaced as a
whole assembly. Check procedures in
Tables 2-1, 2-2 and 2-3 first and verify
that other problems do not exist. Then,
refer to Section 3.6.1 and test the LCD
Display.
Replace Display PC Board or LCD. See
Repair Procedures 4.3.2. After repair,
proceed with Performance Tests in Sec-
tion 3.6.
Summary of Contents for EC Series
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