OHAUS CKW-55, Service Manual

Page: 13 / 68

2-1
CHAPTER 2 DIAGNOSIS
SYMPTOM
Indicator will not turn on with
AC Power supply connected.
PROBABLE CAUSE
Power cord defective.
REMEDY
Check the power cord for cuts or abra-
sions. If OK, proceed.
Refer to section 4.1 and open the indi-
cator.
CAUTION:
Hazardous voltages are present; use
extreme care when making measure-
ments.
Check ac voltage at the Power
Supply Board, on connector CN1. Move
the power cord and see If the ac line
voltage remains constant on the con-
nector. If not, replace the power cord. If
OK, proceed.
2. DIAGNOSIS
This section contains information needed to properly evaluate the reported problem and diagnose its
cause.
2.1 BASIC EXAMINATION
Set up the Indicator according to the Instruction manual. Allow the Indicator to stabilize to room
temperature. Examine the Indicator for signs of corrosion or physical damage.
2.2 PRELIMINARY CHECKS
Connect the Indicator’s power cord to a suitable AC power source. Turn the Indicator on. Refer to Section
3.9.1 and observe and record power on information codes and software revision. Record all menu
settings if possible as received. See section 3.9.4. On indicators equipped with an optional battery, allow
the battery to charge up completely at least 4 hours with the indicator turned off. The front panel bar LED’s
will indicate a full charge when the first green segment begins to blink. If the battery fails to charge, “Lo-
Bat” may display when the Indicator is turned on. If a battery problem exists, refer to section 3.7 for
corrective actions and testing.
NOTE NOTE
NOTE NOTE
NOTE: This manual covers only Indicator problems. Some testing requires the Indicator to be connected
to a known good base. For base problems, refer to the Base Service Manual. If the Indicator is not supplied
with a base, testing will be done using a known good base and or Loadcell Simulator.
2.3 TROUBLESHOOTING TABLES
Troubleshooting tables 2-1 through 2-10 identify problems that could be encountered with the Indicator.
The troubleshooting tables refer to interconnection and wiring diagrams in this section to assist in locating
the problem.
2-1 INDICATOR WILL NOT TURN ON WITH AC POWER.