Epson TM-U950 Technical Manual

Rev. A Troubleshooting 4-21
TM-U950/U950P Technical Manual
Stamp does not
operate.
Printer is in slip paper
insertion standby
condition.
B Turn power off and on
again and check
whether paper is
released.
Remove any pieces of
jammed paper.
Lever-stamp drive is
worn or damaged.
B Check lever-stamp
drive for wear and
damage
Replace lever-stamp
drive.
Solenoid-stamp is worn
or damaged.
B Check solenoid-stamp
for wear and damage.
Replace solenoid-
stamp.
Wire break in solenoid-
stamp.
B Check solenoid-stamp
coil resistance. (Nominal
value for 25° C; 19
Ω
±
10%)
Replace solenoid-
stamp.
Stamp drive signal failure B Check stamp drive
signal.
Repair drive circuit.
Different character than
input code is printed.
Receiver or drive IC (U3)
failure
B Check IC (U3) output. Replace IC (U3).
Characters are not
displayed normally on
the customer display
that is connected to DM
connector of the TM
printer.
Receiver or driver IC (U2)
failure
B Check if V + terminal
(pin 2) of IC (U2) is +12V.
Check if V - terminal (pin
6) of IC (U2) is -12V.
Replace IC (U2).
Table 4-3. Printer Mechanism Problems (continued)
Problem Probable Level Checkpoint Action
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