Epson TM-FX2180 manual Repairing the Printer Mechanism

EPSON FX-2180 Service Manual

Table 3-7. Repairing the Main Board Assembly (Continued)

Problem Cause Checkpoint Solution

Chapter 3 Troubleshooting

For replacement and adjustment instructions, see Chapter 4, “Disassembly and Assembly,” and Chapter 5, “Adjustment.” If the same symptom recurs after you repair the printer mechanism, select another

A particular	IC1 is
dot does not	defective, or
print.	one of the
	print head
	drive
	transistors
	(Q2 − Q19) is
	defective.

∙Check the input signal waveform (CH 1) at the base of each transistor.

∙Check the output signal waveform (CH 2) at the collector for each transistor.

CH 1

CH 2

Figure 3-18.

Waveform 11

∙If an input signal is not correct, replace the main board.

∙If an output signal is not correct, replace the transistor or the main board.

probable cause and repair the printer mechanism again.

Table 3-8. Repairing the Printer Mechanism

Problem	Symptom	Cause		Checkpoint	Solution
Carriage	When you turn on	The CR		Measure the	Replace
operation is	the printer, the CR	motor is		CR motor’s coil	the CR
abnormal.	motor does not	defective.		resistance. It	motor.
	rotate at all.			should be
				approx. 2.7 Ω.
				(See Table
			3-3.)
	When you turn on	CN11 is not		Check the	Connect
	the printer, the CR	properly		connection.	CN11.
	motor does not	connected to
	rotate at all and	the main
	the control panel	board.
	LEDs flash.
	When you turn on	The timing		Check the	Replace
	the printer, the CR	belt has		timing belt.	the timing
	motor rotates but	come off the			belt.
	the carriage does	pinion gear of
	not move.	the CR
		motor.

3.6 Repairing the Printer Mechanism

The table below describes how to repair the printer mechanism. It lists various printer mechanism problems and symptoms, and provides likely causes, checkpoints, and solutions. The checkpoint column lists what to check and indicates how the printer mechanism works when it is operating properly. The solution column tells you how to repair the printer mechanism.

The carriage	The platen	Move the	Check the
moves slightly and	gap is too	carriage by	platen gap
then stops.	narrow.	hand to check if	and adjust
		it moves	it if it is too
		smoothly.	small. See
			Chapter 5.

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