Printer Mechanism Problems - Samsung SRP-275 Service Manual

7-2-3 Printer mechanism problems

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