Epson TM-FX2180 manual Repairing the Power Supply Board, Problem Cause Checkpoint Solution

EPSON FX-2180 Service Manual Chapter 3 Troubleshooting

4. Abnormal Printing

START

3.4 Repairing the Power Supply Board

Is the self test		YES		Check the data from the
				host PC using the hex
printed correctly?
				dump mode.
NO				NO
			YES		Reset the settings
	NO	Are any print head		Are the printer
Are all the				settings correct?	to their defaults.
		wires broken?
dots printed
correctly?		NO		YES
					YES
				NO
YES					Is the problem
		Check the print head's			solved?

The table below provides instructions on how to repair the power supply board assembly. It lists various power supply board problems and provides likely causes, checkpoints, and solutions. To determine whether a component is defective, compare its readings with the correct waveforms, resistances, and other values listed in the table below. Then replace the component if necessary.

YES

Are all the

coil resistance as

Are the correct

END

dots aligned

described in Table 3-1.

NO

correctly?

printer drivers

installed?

NO

Install the correct

printer drivers.

Is the print head

NO

YES

Perform the

coil resistance

B

bidirectional alignment.

correct?

NO

YES

(See Chapter 5.)

Is the problem

YES

Test the print

solved?

head drivers on

END

Check the FFC

the main board

Does the printer

YES

as described in

Check the platen

NO

Is the

using a multimeter.

Table 3-7.

work correctly with

gap/parallelism. (See

problem

another printer

Chapter 5.)

solved?

cable?

Replace the

NO

cable.

WARNING

Note:

The OPERATE button on the control panel only turns the secondary power circuit on or off, so the primary circuit is live as long as the printer is connected to an AC power outlet. Before you touch the power supply board or repair it, disconnect the printer from the AC power outlet.

		YES
		YES	Is the FFC		Replace the main
		END			board.
			OK?
Is the	YES
			NO
problem
					END
solved?
NO	END		Replace			YES
				Are the print
			the FFC.		NO	Is the problem
		Are the bottoms of the		head drivers on
						solved?
	NO	characters missing?		the main board
				OK?		NO
			NO			END
		YES			Replace the
			Is the
Replace the				YES	print head
print head.		Reinstall	problem		and the main
		the ribbon	solved?		board.
	END	mask.	YES	Replace the
			END	print head.	END

NO	Is the		The computer is the
	problem
		END	source of the
	solved?
			problem.
	YES
	END

Use an oscilloscope to check the waveforms in Table 3-6.

Table 3-6. Repairing the Power Supply Board

Problem	Cause	Checkpoint	Solution
The +35 V and +5	Diode bridge DB1	Measure the DC	Replace
V lines are not	is dead.	voltage between pins	DB1.
output when the		3 and 4 of DB1.
printer is turned
on.
	Transformer coil	Measure the	Replace
	T1 is open.	resistances of the T1	T1.
		transformer coils at
		pins 12 and 15, 9 and
		11, 7 and 8, and 3
		and 4.

Figure 3-7. Flowchart 4

3-7