Oce 3121 Technical & Service Manual page 100

A, B and D are approximate values. Optimum images may still be obtained
even if the values are outside the range. You may omit ' temporary remedy ' if
the images are optimum.
For PD and 200 PWM
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20 <= A <= 50
-40 <= B <= 40
0 <= D <= 8
For 600 PWM
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20 <= A <= 60
-70 <= B 20
0 <= D <= 8
Check the above and press ' DATA SET ". It will highlight.
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Then, press 'OK'.
This will set the measured values under A, B and D.
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Press ' Page ' and execute ' 200 PWM: density automatic adjustment ' . Fol-
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low the same steps, starting with step 9.
When ' 200 PWM density automatic adjustment ' is finished, execute ' 600
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PWM density automatic adjustment'. Follow the same steps, starting with
step 9.
Press ' Reset ' twice, ending the service mode. If the values for A, B and D do
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not match, after repeated execution of ' copy density automatic correction ',
and it proves to be impossible to obtain optimum images, the follow temporary
remedy can be used. The temporary remedy will enable normal copying. How-
ever, as the image quality is inferior, correct the faults as soon as possible.
Then, execute ' copy density automatic correction ' .
Possible fault
OPC unit
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Scanning lamp
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Laser unit
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Power supply PBA
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Analogue processor PBA
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Image processor PBA
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ed.1 Image quality 27