Sharp ER-04RP Service Manual page 21

ER44RP
9-3. Troubleshooting chart
9-3-1. Head feed trouble
I
Phenomenon
Carriage does not
move
Carriage does not stop
Symptom
Possible cause
Checking procedure
Remedy
Motor does not run
Motor defective
Apply rated voltage across soldered
Replace motor.
motor leads @(red)and @(black) on
solder side of connector
PCB SA to check if motor runs.
Applied voltage to
Check voltage across pin 1 (@) and pin
Repair control block.
motor not normal
2 (@) of connector A on connector PCB
SA to see if applied voltage is normal.
Connector PCB SA
Check for continuity between pin 1 of
Replace connector
defective
connector A and motor lead (red) and
PCB SA.
between pin 2 and motor lead (black).
Motor runs
Paper jam
Remove printhead and check for
Remove foreign
jammed paper or foreign matter.
matter, etc.
Printhead wire caught
Check if wire gets caught.
Replace printhead SA.
in ink ribbon or paper
(Also replace ribbon
cassette if wire gets
caught in ribbon)
Foreign matter caught Manually rotate motor pinion to check if
Remove foreign
in gear wheel train or
gear train moves smoothly. matter, etc. or replace
broken gear causing
broken gear.
action failure
Timing belt SA and
Remove carriage BK and check if Adjust position of
pulley out of phase
carriage drive pin and pulley timing belt SA.
engagement is not out of phase.
Carriage bearing Check if carriage rail (front and rear) is
Remove foreign
trouble
lubricated and if carriage rail moves matter, etc. and apply
smoothly when turned by hand. oil, or replace carriage
BK and carriage rail.
DPMP/RP signal Check voltage applied to each sensor
Repair control block,
abnormal
and its output waveform. Also check replace sensor, or
connector PCB SA for continuity. replace connector
PCB SA.
DP/HPIRP signal Check voltage applied to each sensor
Repair control block,
abnormal
and its output waveform. Also check replace sensor, or
connector PCB SA for continuity. replace connector
PCB SA.
Trouble in mntrol block Check hardware circuit in control block Repair control block or
and wiring from control block. rectify wiring.
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9-3-2. Printing trouble
Phenomenon
Symptom
Possible cause Checking procedure Remedy
Cannot print (ail dots Carriage motion is Head FPC connection Check connection of FPC. Firmly insert FPC to
or particular dots) normal failure
establish proper
connection.
Printhead SA defective Replace printhead SA with a new one
Replace printhead SA.
and check the result.
Improper mounting of Check mounting condition of ribbon. Mount ink ribbon
ink ribbon
correctly.
DP/HP/RP signal Check voltage applied to each sensor
Repair control block,
abnormal and its output waveform. Also check
replace sensor, or
connector PCB SA for continuity. replace connector
PCB SA.
Trouble in control block Check hardware circuit in control block
Repair control block or
and wiring from control block.
rectify wiring.
Connector PCB SA
Check for continuity between connector Replace connector
defective A and connector B. (Refer to 8-2. Wiring
PCB SA.
diagram)
Foreign matter caught
Remove printhead SA and check printing
Remove foreign
in printing area area for foreign matter.
matter.
Deformation or Remove printhead SA and check ribbon
Replace or property
improper mounting of mask for deformation and mounting
mount ribbon mask.
ribbon mask
condition.
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