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SF-7700
sF-m60
e
[4]
COPY QUALITY ADJUSTMENTS
COpyqualitymust be adjustedfor any of the fotbting:
.At the time of maintenance.
Afterthe drumcurrentadjustments,afterthe coronasare repfacad,
after the mrona wires are rePlacad,or after a high vottageunit is
replaced.
After replacingthe CLC PWB unit or its mponents.
.After adjustingthe VR on the CLC PWB.
After replacingthe autOexposuresensor (AE).
After replacing,adjusting,troubles-,
or dis~
y of the
opticalsystem (copy lamp reflector,etc.).
After disassembling, troubleshooting,or adjusting the optical
system.
After replacingthe OPC drum.
After rapladng the Main PWB unit.
When the tiOUMestatus "U2" is dispfayad.
After re@acerrtent o f the main PWB.
After replacementof an IC (RAM IC3) withinttre main PWB.
After wing
the exposureContra.plate W.
1. Precautions in copy qualm adjustments
Observe the follting
before performing the copy quality
adjustments.
@ Clean componentsinthaopticai system(tiglass,
Ierrs, m imr,
copy lamp, and refl.~or).
@ Clean the auto exoosuresensorsurface w& a cfotftdamDarrad
with alcohol. (UK& M0049C~-
NOTE: WiDinoWitmadrv ctothwilltiusearf e ~
charge
to ~he-sensora~ will attract more dust.
@ Clean the mrona wires (MCU, TCU).
@ Clean the developer unit.
@ Clean the area near the OPC drum.
@ Clean the OPC drum cleaning blade.
2. Copy quality adjustment pro~ure
See
the flowchartfor copy quality adjustmm ~.
A. Descriptionof the "flowchatifor copy qualm
adjustmentprocedure
2)
Place a test chati on the ~gind table
Place foursheetsof blankwhitepaper, 120mm x 420mm, (4.75"
x
17'? on too of each other and pfa~
~
test ~afi
T
Abut I
:OG+069Cs~
or KODAK gray tie
baa
or on it, so
: the gray -Ie
-ion
of the test chart can be copied.
1
I
I
1~
-
4) Set the &py dens~ correctionlevel to the middle
When the dwrswitch (DS~
is turned off by openingthe front
Panel,the status "CH" is disp[ay~ in the copynumberindicator
m
and fourout of five COpy density indi~tors come -e
with the
remainingone blinking.This"blinking indicatorindicst~ the copy
densitycorr~ion ievel
CUrrStiIy
emp~y~, and it ISpossibletO
select another level usi~ the
CODV
densitylevel ~rol
kav.
. .
NOTE: To change the w-py densityCorrti'levet, keep the COW
densityset.key dapre~
for a periodof morethan 2.5
*Ond.
OtherwiW, the level may not be changed.
~-.
—------------
.-.
-- .,-
..
.... ... .. - .-- — ..... ....
-
Grayscab
J
.Eacf.bvat of the copydensitym ~
kvd is representedby
L2, Ll, N, Dl, D2. In order to _
another m~
density
correctionw,
it is ~
to sat the key in the center (N)
Ie@ - N btinkirrg and ~
othersare activad.
This featurais i-
totfta AE sansorusadintheconvantiortd
modek and is @
to a
copy @ity
deteriorationMused
by fatigueof the tim
@dust
in the opw
@em
by shifting
the copy lamp added *.
.(5)-
T
L1(4)
m
T L.(,,
D1(2)
N(3)
w
Dark
aD
\
D2
(D*)
54321
~-~
.
sensor a reaat a ~tanr
%
(AEsensor o utput t avelat a
instant kvaf)
The copy density~
fevet
is not m Wmg ss h
~y
densityM
(whoseteveta
are changed ~ the copy d ensity
control
key is used,) they have a differentsignificance.
To change the ~
density~
lev~, ths
qy
~si~
Ievd (copy
lampaddedvoftaga)is shifted.Fourout of tie copy
d~sity indicators cofrta-
withthe r~nirtg
one itibmr
Mnking and the status "CH" on dispfay(when the doorswfich
isoff,)tDbSmSdytOChSngathS C Opy_corractiorr
~vei,
TO ti~
the q
-
kvd, thS-y
dansty IWd (COW
~p
added x)
W
is changed. It is possibleto change
the Wd whenone of five copy_
bet indicatorsis active
with the d~
actuated.'
6) Test command47
c +
'P +
0-
P + @ * ~ -
psw
When h
test command 47 is executed, the mirrorbass
goas
into actionand the ~
lamp drivingvohage can be sat within
a ra*
of ~
(110~ to 60V (160~ in an increment of 5V
each, and, the AE sensoroutputcharacteristi~ ag~rrst the copy
lampvoltageaddedduringcopyingof a whiteoriginal(copylamp
int~~)
is
SW~
in the main PWB RAM. The cow densi~
adjustment(tastcommati.46) is mnductadon the basisof these
characteristics.
4-1
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— ----.-.
.. .. ..
.,
.,
.1-..,:-->.
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