Processing Unit - Sharp SF-2030 Service Manual

2. Processing Unit

(1) Adjustment of Blank Lamp Position
1 Check that the center deviation is 2.0mm or less. (If the center
deviation is more than 2.0 mm, correct it).
2 Set an A3(11x17)-size blank original on the original table, and
with the original cover opened, make a reduced (x 0.64) copy
using an A3 (11 x 17) paper.
3 Measure the width of solid areas. If the width is more than 1
mm, adjust the blank lamp unit position so that the width of the
solid areas is 1 mm or less.
A
B
IA-BI 1mm
1 notch of the adjusting cam : lamp movement 0.5 mm
Half notch of the adjusting cam : lamp movement 0.25 mm
(2) Adjustment of High-Voltage Output Balance
A. Applying the Special Measuring Tool
Electrode sheet (UKOG-0110FCZZ) Electrode sheet harness (DHAI-0304FCZZ)
Microswitch
(QSW-M0118FCZZ)
Digital multimeter (or ampere meter)
UKOG-0110FCZZ
Note: use a multimeter with measuring range of 0 to 100 µA and
7 – 3
Forward
The blank lamp unit
moves forward
The blank lamp unit
moves backward
orange
A
orange
blue
white
black
white
red
PHOG-0007FCZZ
QTIPH0017FCZZ
(Circuit diagram of A-portion)
300KΩ X 2
(VRN-RT2EK304F)
error of ±1% or less.
Backward
(QCLIZ0005FCZZ)
green
(QCLIZ0006FCZZ)
blue
black (QCLIZ0010FCZZ)
(QCLIZ0004FCZZ)
yellow
red (QCLIZ0002FCZZ)