11. Trouble Shooting - KERN PBJ-N Service Manual

24 11. Trouble shooting

11.1 General trouble shooting
Symptom
(a) Nothing appears in the
display.
(b)Missingnumbers,
symbols in the display.
(c) Keys do not operate
(d) "oL" or "-oL"
is displayed.
(e) Large linearity error
(f) Zero drift, sensitivity
drift are large.
59
Probable cause
Correct power is not supplied.
Wrong AC adapter or failure
Cable, Flat26 (B6) is disconnected.
Assy,Display (B4) is failed.
Assy,Display (B4) is failed.
Cable,L105(14) is disconnected.
Switch board assy(C3) is failed.
Assy,Display(B4) is failed.
Pan assembly(6) and/or Cap,Pan
supporter(5) are not installed.
Protect cover assy(8) and Pan
assembly(6) are in contact.
Pan assembly(6) is not installed
correctly.
Pan is loaded exceeding the weighing
capacity.
Cable,L65(U27) is disconnected.
Pt-Ni band(U14) is twisted/bent/badly
soldered.
The hole of Stopper plate(U11) is
contacting with the pin of Lever Assy.
Stopper, Lever (U12)
Assy,Detector(U8) are not correctly
positioned.
Assy,Analog(B3) is failed.
Force coil assy(L1) wire break/ earth
leak
Force coil assy(L1) and Magnet
assy(U6) are contacting directly or
with dusts.
Unit assy(1) is damaged.
Linearity adjustment was incorrect.
Inputted calibration weight value was
not correct in linearity adjustment.
Essentially poor
repeatability
Essentially large drift is causing the causing the symptoms.
symptoms.
Essentially large corner load error is
causing the symptoms.
Span calibration
not been
Damaged EEPROM data. performed correctly.
Unit assy(1) is damaged.
Warm up is insufficient.
Direct sunlight, or air current from
heater or cooler exist.
The installation
has been
changed. Temperature sensor is failed.
Damaged EEPROM data.
Unit assy(1) is damaged.
Remedy
Check the power supply and connect
correctly.
Replace the AC adapter.
Connect Cable,Flat (B6) correctly.
Replace Assy, Display (B4).
Replace Assy, Display (B4).
Connect Cable,L105(14) correctly.
Replace Switch board assy(C3).
Replace Assy,Display(B4).
Install Pan assembly(6) and Cap,Pan
supporter(5) correctly.
Install Protect cover
double-sided tapes firmly when used.
Install Pan assembly(6) correctly.
Use the balance within its capacity.
Connect Cable,L65(U27) correctly.
Replace Pt-Ni band(U14) / Solder Pt-Ni
band(U14) correctly.
Position and lock Stopper plate(U11)
correctly without contacting with the
lever pin.
and/or Position Stopper, Lever (U12) correctly
and adjust
Assy,Detector(U8) correctly.
Replace Assy,Analog(B3).
Replace Force coil assy(L1).
Remove dusts and position Force coil
assy(L1) correctly.
Replace Unit assy(1).
Perform linearity adjustment correctly
using accurate calibration weights.
Check repeatability and refer to (i)
is (Repeatability)
Check drift and refer to (f) (Drift)
Check corner load performance and
refer to (h) (Corner load error)
has Perform span calibration.
Input the data with the Adjustment S/W.
Replace Unit assy(1).
Warm up the balance sufficiently.
Change the balance installation site.
Remove sunlight / air current.
site Warm up sufficiently and perform span
calibration.
Replace temperature sensor.
Input the data with the Adjustment S/W.
Replace Unit assy(1).
assy(8) with
the height of
PBJ_N-SH-e-1810.docx