Chapter 4 Troubleshooting; Troubleshooting; Self-Test - Epson TM-U950 Technical Manual

CONFIDENTIAL
Chapter 4

Troubleshooting

Troubleshooting
Use the following to troubleshoot and repair the printer:

Self-test

Use the self-test to check the operation of the control circuitry and the printer mechanism.
Troubleshooting flowchart
When the source of the problem is not clear, use the flowchart to find and replace a defective
component.
Troubleshooting tables
Follow the steps outlined in these tables to repair a defect whose symptoms are known.
Self-test
The self test can be performed for paper rolls or for slip paper. Make sure the printer is turned
off before starting the self-test with either paper type.
Initiating the self-test
Paper roll self-test
1. Insert paper rolls in both receipt and journal sides of the printer, and close the printer cover.
2. Turn on the printer while keeping the RECEIPT FEED button depressed. The self-test starts
Slip paper self test
1. Insert paper rolls in both receipt and journal sides of the printer, and close the printer cover.
2. Turn on the printer while keeping the JOURNAL/SLIP FEED button depressed. The SLIP
3. Feed a sheet of slip paper into the printer. The self-test starts, loading the paper
Self-test standby
Paper roll self test
1. When the status information printing is complete, the following is printed:
Rev. A
and status information is printed on the receipt paper roll.
Note:
When printing on slip paper, paper rolls should also be inserted in both sides of the printer. This
prevents paper jams.
LED flashes.
automatically and then printing status information.
TM-U950/U950P Technical Manual
Troubleshooting 4-1