Seca 664 - Description of Faults; Scale Does Not Start; Incorrect Weight Readings; Display and Keypad Issues

Service manual Description of faults
21.11.08- Winterberg/Jen
1(2)
30-34-00-588 Index: d
Please refer to the operating instructions to make sure that scale malfunctions are not
caused by operation faults. Should any faults occur, the following table will help you to
identify the cause of the fault.
Fault description Possible cause Remedy
Scale does not start  Battery not inserted
or flat

Check the batteries
 Voltage supply
defective

Check the voltage at the relevant electronics connections, correct
the interruption
 Bus connecting
cable defective

Check the plug-in connections, check the cable for interruptions,
replace if necessary
 Keyboard defective
or not connected

Check the cable connections, check cable and keyboard for
interruptions, replace if necessary. (If possible please state the
number of the keyboard when ordering a replacement.)
 Bus fault  Disconnect power supply unit and battery from the scale, wait for 60
seconds, then reconnect.
 Electronics
damaged by a
wrong type of power
supply unit

Replace the electronics. (Warning: The damaged electronics can
draw so much current that the power supply unit is also damaged.)
Scale repeatedly shows
no weight or an incorrect
weight

Packaging /
transport locking
device not removed
completey

Check the scale
 Scale not correctly
adjusted

Recalibrate the scale
 Sensor damaged  Replace the sensor and readjust the scale
 Lever system
damaged or load
transmission to
sensor interrupted

Check the base frame (and tie rod if present) for damage or incorrect
assembly
Scale remains in the
segment test or
measured values
fluctuate heavily

Short-circuit
between sensor
cable and housing

Look where the insulation is damaged (using a multimeter if
necessary) and repair it.
Display incomplete  Display defective  Replace the electronics
Scale does not respond
to keystrokes

Keyboard defective
or not connected

Check the cable connections, check cable and keyboard for
interruptions, replace if necessary. (If possible please state the
number of the keyboard when ordering a replacement.)
Faults occur during the
weighing operation

Display:
Er:x:no

Electronics detecting a fault.
 X : Module number
 No Fault number
 Er:X:10

Sensor defective or
connected
incorrectly

Check the sensor and replace it if necessary (readjustment required
after replacement).
 Er:X:11

Sensor defective,
supply lines
damaged or
electronics defective
 Check supply lines, check sensor and replace as required
(readjustment required after replacement)
 If several load cells are fitted, check the allocation (colour codes)
 Replace the electronics
 Er:X:12

Initial load too high  Check the initial load
 Check the load levers (jammed or bent), sensor damaged, replace
and readjust if necessary