Epson TM-U950 Technical Manual

4-24 Troubleshooting Rev. A
Error Types And Countermeasures
Follow the flowcharts on the next page depending on the ERROR LED blinking pattern, and
repair the printer. When an error occurs:
❏ The printer stops all operation
❏ The printer goes off-line
❏ The ERROR LED blinks
(*1) This error occurs for a short time during normal printing when print head reaches high
temperature. In this case no repair is necessary.
Table 4-5. ERROR LED Blinking Pattern
Error Error Description
ERROR LED blinking pattern
Action
(1) Memory or gate
array read/write error
Read/write check has
failed.
Action 1
(2) High-voltage error Power supply voltage is
too high.
Action 2
(3) Low-voltage error Power supply voltage is
too low.
Action 2
(4) CPU execution
error
CPU is trying to
execute an invalid
address.
Action 1
(5) Thermistor error Print head
temperature is
abnormal.
Action 1
(6) Auto-cutter error Auto-cutter does not
operate properly.
Action 3
(7) Home position
detection error
Home position could
not be detected
properly due to paper
jam in carriage etc.
Action 3
(8) Carriage detection
error
Carriage motor has
gone out of step due
to paper jam in
carriage or other
problem.
Action 3
(9) Slip paper eject
error
Slip paper is not
ejected properly after
being advanced.
Action 1
(10) Head high-
temperature error (*1)
Print head
temperature is too
high.
Action 1 (*1)
160ms
CONFIDENTIAL

Epson TM-U950 Specifications

General

Print speed	18.6 ips
Character size	1.3 x 3.1 mm
Print technology	Dot matrix
Paper dimensions	210 x 297 mm
Dimensions (WxDxH)	251 x 298 x 194.5 mm
Electromagnetic compatibility	VCCI, FCC, CE
Safety	UL, CSA
Country of origin	China
Mean time between failures (MTBF)	180000 h
Serial interface	Yes
Standard interfaces	RS-232C
Weight (imperial)	12.3 lbs
Pallet width	1200 mm
Pallet height	1000 mm
Pallet length (UK)	2250 mm
Quantity per pallet	24 pc(s)
Quantity per pallet (UK)	36 pc(s)
Quantity per pallet layer	4 pc(s)
Harmonized System (HS) code	84433210
Quantity per pallet layer (UK)	6 pc(s)
Package depth	425 mm
Package width	360 mm
Package height	330 mm
Package weight	7196 g
Quantity per pack	1 pc(s)

Weight and Dimensions

Depth	298 mm
Width	186 mm
Height	195 mm