Gestetner B147, Service Manual

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COPY SERVICE MODE
SM 5-15 B147/B149/B190
Service
Tables
SP2-XXX (Drum)
2-001 [Charge Bias] Charge Roller Bias ( DC or AC component: [Color], Process Speed)
U: Upper, L: Lower
Adjusts the DC component of the charge roller bias in the various print modes.
Charge bias (DC component) is automatically adjusted during process control;
therefore, adjusting these settings does not effect while process control mode (SP3-
125 Default: ON) is activated. When deactivating process control mode with SP3-125,
the values in these SP modes are used for printing.
2-001-1 DC:[K] *BCU
2-001-2 DC:[Y] *BCU
2-001-3 DC:[M] *BCU
2-001-4 DC:[C] *BCU
[ 300 to 1000 / 700 / 10 volts/step ] DFU
•
Displays the AC component of the charge roller bias adjusted during machine
initialization or process control self-check.
• Sets AC bias in the various print modes for test purposes.
If the optimum AC bias cannot be selected because of the upper and lower limits
(SP2-001-10 and 11 for K, SP 2-001-21 and 22 for YMC), this may cause white spots
on images and black spots on background. (In particular, spots may appear if the
room temperature is very low.)
Check the printouts after changing the AC bias with these SP modes (SP2-001-12 to
20) and exiting SP mode. If increasing or decreasing the AC bias for relevant color
solves the spot problem, shift the AC upper and lower limits (SP2-001-10 and 11 for
K, SP 2-001-21 and 22 for YMC) by the value increased or decreased during the test.
NOTE: The AC upper and lower limits have been optimized by the manufacturer;
therefore, these settings should not be adjusted in the field.
2-001-5 AC:[K] 62.5 [ 0 to 255 / 40 / 1/step ] DFU
2-001-6 AC:[K] 125 [ 0 to 255 / 71 / 1/step ] DFU
2-001-7 AC:[K] 185 [ 0 to 255 / 159 / 1/step ] DFU
2-001-8 AC:[Y] 62.5 [ 0 to 255 / 40 / 1/step ] DFU
2-001-9 AC:[Y] 125 [ 0 to 255 / 71 / 1/step ] DFU
2-001-10 AC:[M] 62.5 [ 0 to 255 / 40 / 1/step ] DFU
2-001-11 AC:[M] 125 [ 0 to 255 / 71 / 1/step ] DFU
2-001-12 AC:[C] 62.5 [ 0 to 255 / 40 / 1/step ] DFU
2-001-13 AC:[C] 125 [ 0 to 255 / 71 / 1/step ] DFU
Sets the upper limit of the AC component adjustable range for black.
During machine initialization and process control self-check, the AC component of the
charge roller bias is automatically adjusted within the range specified by SP2-001-014
through 017.
2-001-14 AC Target [K] *BCU [ 0 to 255 / 86 / 1/step ] DFU
2-001-15 AC Target [Y] *BCU [ 0 to 255 / 83 / 1/step ] DFU
2-001-16 AC Target [M] *BCU [ 0 to 255 / 86 / 1/step ] DFU
2-001-17 AC Target [C] *BCU [ 0 to 255 / 83 / 1/step ] DFU
[TrimAdjust] Trimming Adjustment 2-101
This program adjusts the trimming area (the area in which no image is created).
2-103-1 front *BCU [ 0.0 to 6.0 / 3.0 / 0.1 mm/step ]
2-103-2 back *BCU [ 0.0 to 6.0 / 3.0 / 0.1 mm/step ]
2-103-3 lead *BCU [ 0.0 to 6.0 / 2.0 / 0.1 mm/step ]
2-103-4 trail *BCU [ 0.0 to 6.0 / 2.0 / 0.1 mm/step ]