OHAUS TROOPER, Руководство по обслуживанию

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2-11
CHAPTER 2 DIAGNOSIS
SYMPTOM
Scale does not respond to front
panel controls.
NOTE:
Use a known good ac adapter
for this test.
PROBABLE CAUSE
Membrane switch defective.
REMEDY
1. Open the scale, remove six screws
from the bottom of the scale.
2. Refer to Figure 2-4. Using an Ohm-
meter, measure the resistance on all
switches on the membrane switch
cable, they should all be open, then
press each button and check that the
resistance is zero for each button. If
continuity is not present, the mem-
brane switch is defective. Replace
membrane Switch -> Repair proce-
dures 3.4
or
Substitute with a good membrane
switch plugged into the Main PC board
and press each button if they work,
the original membrane switch is de-
fective and should be replaced.
-> Repair procedures 3.4
3. If the membrane switch is OK, re-
place the Main PC Board. -> Repair
procedures 3.5
TABLE 2-10 TROOPER COUNT SCALE - DOES NOT RESPOND TO FRONT PANEL CONTROLS.