Sharp ER-04RP Service Manual page 31

ER-04RP
[Reassembly procedure]
Reverse the disassembly procedure.
However, the following adjustments are necessary.
ADJUSTMENT 1
Adjustment of bi-directional printing misalignment
<Procedure>
Move the RP sensor SA to the right or left to adjust so that no
misalignment occurs in bi-directional printing.
H H H H------H —
H H H H------H ~
cMethod of adjustment>
Make the adjustment in accordance with the following table.
Phenomenon
Method of adjustment
I
H H H-----H —
Move the sensor SA to the right
~
H H-----H — (toward the drive gear).
I
H H H-----H —
Move the sensor SA to the left
H H H-----H —
(toward the home position).
IADJUSTMENT 21
RP/HP waveform adjustment
<Procedure>
Measure the relationship between the RP waveform and the HP
waveform on the oscilloscope when bi-directional printing is made.
I
ON
r
RP
OFF
OFF
I
. .
HP
1[
%
---------- ------------
DP
<Check points>
RP waveform —
Pin @of connector CNB
HP waveform — Pin @of connector CNB
GND — Pin@ of connector CNB
<Method of adjustment
Make the adjustment in accordance with the following table.
1
Value of A
Method of adjustment
I
5ms and lower
Move the sensor SA to the left (toward the
home position).
5- 8ms No adjustment necessary
I
8ms and over
Move the sensor SA to the right (toward the
drive aear).
I
<Checb
After the adjustment, check to ensure that no misalignment occurs
in bi-directional printing.
10-3-13. Disassembly/reassembly of connector
PWB SA
[Disassembly procedure]
1.
Unsolder the red and black motor leads from the connector PWB
SA (5-2) using the soldering pencil.
2. Remove two holding screws (5-10).
3. Remove the connector PCB SA (5-2).
[Reassembly procedure]
Reverse the disassembly procedure.
However, the following adjustments are necessary.
BEFORE OPERATIONS
Replacement of diode (for printing speed adjustment) on PWB
<Procedure>
Make sure to replace the diode with a new one when the PWB is
replaced.
NOTE 1: If this procedure is not observed, it may not be possible
to satisfy the specification with regard to the printing
speed.
NOTE 2: Observe the polarity of the diode.
ADJUSTMENT 1
Adjustment of bi-directional printing misalignment
cProcedure>
Move the connector PWB SA back and forth to adjust so that no
misalignment occurs in bi-directional printing.
H H H H------H
H H H H------H
<Method of adjustment>
--
Phenomenon Method of adjustment
H H H-----H —
Move the PWB SA forward
H H H-----H —
(toward the platen).
H H
H-----H —
Move the PWB SA rearward
H H H-----H —
(away from the platen).
\
ADJUSTMENT 2
RP/HP waveform adjustment
cProcedure>
Measure the relationship between the RP waveform and the HP
waveform on the oscilloscope when bi-directional printing is made.
RP
OFF
ON
OFF
- -
}1
HP
bT
1[
%
---------- ------------
DP
cCheck points>
RP waveform —
Pin@ of connector CNB
HP waveform — Pin @ of connector CNB
GND — Pin@ of connector CNB
Tools
Phillips screwdriver
Soldering pencil
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