Service manual

Rev. 2.00
- 126 -
SRP-275
7-2-3 Printer mechanism problems
Problem Probable Cause Level Checkpoint Action
B
Check the width, length and
thickness of the paper
Use paper roll that
corresponds to
specifications
Defective paper supply
A
Check paper roll path for
obstacles
Remove any
obstacles from paper
path
Occurrence of paper jam B Check for paper jam
Open the cover and
remove paper jam
Spring-holder roller is
unhooked or damaged
B
Check to see if the spring is
unhooked or damaged
Hook Spring-holder
roller or replace
In proper connection between PF
motor connector and PCB-head
ass’y
B
Check connected condition
of motor connector into PCB-
head ass’y
Make PF motor
connector into PCB-
head ass’y surely
Wear or damage of teeth of Gear
feeding or Gear reduction
B
Check the gears for wear or
damage
If there is wear or
damage, replace the
gears
Wear or damage of rubber of Shaft-
rubber roller
B
Check the surface of the
rubber for wear or damage
If the rubber is worn,
replace Shaft-rubber
roller
Paper roll is
not fed or
Paper roll
feed pitch is
irregular
PCB-main ass’y failure
(PF motor drive signal failure)
B
Check input signal to paper
feed motor drive terminals of
J4 with an oscilloscope
Replace
PCB-main ass’y
No detection
of paper near
end, paper
end and rear
cover open
Switch-micro failure or paper dust
around switch
A
Check switch function or
dust around switch
Replace
Switch ass’y or
remove dust
The ratchet of Ribbon cassette is
damaged or worn out
B
Check whether the ratchet of
Ribbon cassette is
damaged or worn out
Replace it if damaged
or worn out Ribbon feed
mechanism
does not feed
Wear or damage of the teeth of the
gears
B
Check Ribbon feeder ass’y
and Gear-RE_A, B, C for
wear of damage
If there is wear or
damage, replace it
Lever-change color does not come
back to normal position
B
Check if Lever-change
color position while solenoid
on and off
Replace Solenoid
No working on
ribbon shifting
Carriage head ass’y does not
function to shift Ribbon cassette
B
Check if head carriage
operation when it pushes the
Frame-ribbon
Remove dust around
the gear train, Shaft-
head_guide and
Shaft-head carriage
Rear cover
does not
closed
Spring-locking-L/R is absent or not
hooked
B
Check if Spring-locking-
L/R’s existence and its
position
Reassemble it
Communication condition such as
transmission speed not set correctly
A Check DIP Switch settings
Set DIP Switches
correctly (See Section
2.2.2 Setting the DIP
Switches)
Communication cable failure A
Check to see if the cable RS-
232C null modem cable, and
check its continuity
Replace cable
Command problem B
Check data sent from host
with hexadecimal dumping
function
Correct the
application program
Different
character than
input code is
printed
Interface failure (Receive/driver IC
failure)
B
Above three checks have
been passed
Replace interface