Maintenance Manual Service Maintenance
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6.3.6 Faulty Probability Guide
Please use this guide whenever a fault is detected but no special display configuration is
displayed.
Usually, if a fault regards an electromechanical part and if no feed-back is arised, no
error is detected by the firmware of the printer.
In fact, except for the home postition and ribbon sensors, (that have a feed-back circuit
to return the status condition), the other mechanical parts don't have a return feed-back
because they are in open-loop circuit.
So, for example, if the paper doesn't advance, the fault regards this parts: (paper motor,
driver circuit and logic H/W).
SYMPTOM:
Inconsistent character printing (some dark, some lights, gaps or
spaces or incomplete.
CAUSE:
The ribbon may not be correctly mounted.
ACTION:
Re-install the ribbon cartridge.
CAUSE:
The ribbon cartridge may be faulty.
ACTION:
Install a new one.
CAUSE:
The ribbon doesn't work correctly (RIBBON BLOCKED) message..
ACTION:
Check if the carriage unit movement allows a correct ribbon cartridge
movement.
Replace the left support group pivot assy.
CAUSE:
The printhead cable may be incorrectly installed.
ACTION:
Check for the P.H. cables to be correctly mounted.
Replace printhead cable.
CAUSE:
The printhead may be faulty.
ACTION:
Install a new one.
CAUSE:
The AGA function doesn't work.
ACTION:
Check for the AGA motor impedance, connection and gears movement.
Replace defective components.
CAUSE:
The main board may be faulty.
ACTION:
Install a new one.
CAUSE:
The power supply board may be faulty.
ACTION:
Check the voltages. Install a new one.
CAUSE:
The gap between P.H. and platen is not correct.
ACTION:
Check for the platen adjustment procedure.
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LA400 Multiprinter 6. 12 ER-LA400-SV
