Epson TM-U220 Series Service Manual page 41

Confidential
Cannot pass the test for the Roil Cover.
Table 3-24 Paper roll cover test fails
Probable part/probable cause
Memory switch setting
HP board assembly (518)
Cover open assembly (515)
Main circuit board unit (201)
Cannot pass the test for the Paper Feed Switch.
Table 3-25 Paper FEED button test fails
Probable part/probable cause
Main circuit board unit (201)
Cannot pass the test for drawer #3 status.
Table 3-26 Drawer 3 status fails
Probable part/probable cause
Drawer kick
Sub circuit board unit (123)
Main circuit board unit (201)
Rev.A
Checkpoints
Check the setting of MSW 8-5. If the
setting is OFF, status is not sent from the roll
cover, but the RE sensor is changed.
Confirm if the setting status is ON.
Check the connection. Make sure the
cable is plugged in. Make sure the
connector on the HP board assembly
(518) is connected to connector (CN4) on
the main circuit board unit (201).
Check the continuity with a tester. Make
sure wires are not cut or shorted out. Be
sure wires are arranged correctly.
Check the continuity of the wires for the
cover open assembly (515) with a tester.
Be sure wires are not cut or shorted out. Be
sure wires are arranged correctly.
Check the parts for defects.
Make sure connector (CN4) is connected.
Checkpoints
Check the operation of SW2. Make sure
roll paper is fed when you press the paper
FEED button. Make sure the continuity
changes when you press the button.
Checkpoints
Check the connection. Make sure the
cable is plugged in. Check each leading
pin for drawer 1 or drawer 2.
Check the parts for defects.
Make sure connectors (CNC2 and CNC3)
are connected.
Check the parts for defects.
Make sure connector (CN10) is
connected.
TM-U220 (TypeB/TypeD) Service Manual
Action to correct the problem
Change the setting of MSW 8-5 to
ON. Completed if the test passes.
Plug in the connector. Completed if
the test passes.
Replace the HP board assembly
(518). Completed if the test passes.
Replace the cover open assembly.
Completed if the test passes.
Replace the main circuit board unit.
Completed if the test passes.
Action to correct the problem
Replace the main circuit board unit.
Completed if the test passes.
Action to correct the problem
Plug in the connector. Completed if
the drawer is kicked out.
Replace the sub circuit board unit.
Completed if the drawer is kicked
out.
Replace the main circuit board unit.
Completed if the drawer is kicked
out.
Troubleshooting 3-19