Service manual
Table Of Contents
- COVER
- CAUTION
- Safety precautions
- CONTENTS
- 1-1 Specifications
- 1-2 Handling Precautions
- 1-3 Installation
- 1-4 Maintenance mode
- 1-5 Trouble Shooting
- 1-5-1 Paper misfeed detection
- 1-5-2 Self-diagnosis
- 1-5-3 Image formation problems
- (1) No image appears (entirely white).
- (2) No image appears (entirely black).
- (3) Image is too light.
- (4) Background is visible.
- (5) A white line appears longitudinally.
- (6) A black line appears longitudinally.
- (7) A black line appears laterally.
- (8) One side of the copy image is darker than the other.
- (9) Black dots appear on the image.
- (10)Image is blurred.
- (11)The leading edge of the image is consistently misaligned with the original.
- (12)The leading edge of the image is sporadically misaligned with the original.
- (13)Paper creases.
- (14)Offset occurs.
- (15)Image is partly missing.
- (16)Fixing is poor.
- (17)Image is out of focus.
- (18)Image center does not align with the original center.
- (19)Image is not square.
- (20)Image contrast is low (carrier scattering).
- 1-5-4 Electrical problems
- (1) The machine does not operate when the main switch is turned on
- (2) The drive motor does not operate when (C200)
- (3) The scanner motor does not operate.
- (4) The toner feed motor does not operate
- (5) Cooling fan motor 1 does not operate
- (6) Cooling fan motor 2 does not operate
- (7) Cooling fan motor 3 does not operate
- (8) The drawer motor does not operate
- (9) The registration clutch does not operate
- (10) The upper paper feed clutch does not operate
- (11) The lower paper clutch does not operate
- (12) Paper feed clutch (ST) 1 does not operate
- (13) Paper feed clutch (ST) 2 does not operate
- (14) The bypass paper feed clutch does not operate
- (15) The cleaning lamp does not turn on
- (16) The exposure lamp does not turn on
- (17) The exposure lamp does not turn off
- (18) The fixing heater does not turn on (C610)
- (19) The fixing heater does not turn off
- (20) Main charging is not performed
- (21) Transfer charging is not performed
- (22) No developing bias is output
- (23) The original size is not detected
- (24) The original size is not detected correctly
- (25) The message requesting papaer to be loaded is shown when paper is present
- (26) The message requesting papaer to be loaded is shown when paper is present in the upper drawer
- (27) The message requesting papaer to be loaded is shown when paper is present in the lower drawer
- (28) The size of paper in the upper drawer is not displayed correctly
- (28) The size of paper in the upper drawer is not displayed correctly
- (29) The size of paper in the lower drawer is not displayed correctly
- (30) The printing width of the paper on the bypass is not detected correctly
- (31) A paper jam in the paper feed, paper conveying or fixing section is indicated when the main switch is turned on
- (32) The message requesting covers to be closed is displayed when the front cover, paper conveying unit and lower drawer left
- (33) Others
- 1-5-5 Mechanical problems
- 1-6 Assembly and disassembly
- 1-6-1 Precautions for assembly and disassembly
- 1-6-2 Paper feed section
- (1) Detaching and refitting the upper and lower paper feed pulleys
- (2) Detaching and refitting the bypass paper feed pulley
- (3) Detaching and refitting the left registration cleaner assembly
- (4) Detaching and refitting the right registration cleaner assembly
- (5) Detaching and refitting the bypass paper width switch
- (6) Adjustment after roller and clutch replacement
- 1-6-3 Optical section
- (1) Detaching and refitting the exposure lamp
- (2) Detaching and refitting the scanner wires
- (3) Detaching and refitting the laser scanner unit
- (4) Adjusting the skew and vertical shifting of the laser scanner unit
- (5) Detaching and refitting the ISU (reference)
- (6) Adjusting the position of the ISU (reference)
- (7) Adjusting the longitudinal squareness (reference)
- (8) Adjusting magnification of the scanner in the main scanning direction
- (9) Adjusting magnification of the scanner in the auxiliary scanning direction
- (10) Adjusting the scanner leading edge registration
- (11)Adjusting the scanner center line
- (12) Adjusting the margins for scanning an original on the contact glass
- 1-6-4 Main charging section
- 1-6-5 Drum section
- 1-6-6 Developing section
- 1-6-7 Transfer section
- 1-6-8 Cleaning section
- 1-6-9 Fixing section
- 1-7 Requirements on PCB Replacement
- 2-1 Electrical Parts Layout
- 2-2 Electrical parts layout
- 2-3 Operation of the PCBs
- 2-4 Appendixes
2AV/X
2-1-14
2-1
• Correction based on the total drive motor time
The toner sensor control voltage is also corrected based on the total time the drive motor (DM) has been on from
execution of maintenance item U130, so that the toner sensor output voltage is regulated properly.
300 500 800 1200 2000 3000 6000 7000
Drive time (min.)
X: Toner sensor control voltage for initial developer setting (the value set in U131 in bits)
Correction data
X-10
0
X-20
X-30
X-40
Figure 2-1-19 Correction based on the total drive motor time
a: When maintenance item U130 is run for initial developer setting, the total drive motor time is cleared and the toner
sensor control voltage correction data becomes 0.
b: When the total drive motor time is between 300 and 500 min., the correction data is decreased according to the
increase in the total drive motor time.
c: When the total drive motor time is between 500 and 800 min., the toner sensor control voltage is corrected with a
constant value of –10.
d: When the total drive motor time is between 800 and 1200 min., the correction data is decreased according to the
increase in the total drive motor time.
e: When the total drive motor time is between 1200 and 2000 min., the toner sensor control voltage is corrected with a
constant value of –20.
f: When the total drive motor time is between 2000 and 3000 min., the correction data is decreased according to the
increase in the total drive motor time.
g: When the total drive motor time is between 3000 and 6000 min., the toner sensor control voltage is corrected with a
constant value of –30.
h: When the total drive motor time is between 6000 and 7000 min., the correction data is decreased according to the
increase in the total drive motor time.
i: When the total drive motor time exceeds 7000 min., the toner sensor control voltage is corrected with a constant
value of –40.
(5) Correcting toner sensor output voltage
The toner sensor output voltage is corrected according to the absolute humidity at power-on (the main switch turning on),
fixing temperature and accumulated drive time.
Toner sensor output voltage after correction = Toner sensor output voltage before correction – Correction data at power-
on
Correction data at power-on = A – B
If A – B ≤ 0, the correction data at power-on is 0
A: Correction data based on the absolute humidity and fixing temperature
B: Accumulated drive time from the main switch turning on (total drive motor on-time)
If the fixing temperature at the main switch turning on is 50°C/122°F or below, correction data A is determined as follows:
Correction data A
+15
+30
The absolute humidity at the last main switch turning off
was 50 g/m
3
or below and the absolute humidity at the
main switch turning on was 50 g/m
3
or below.
Cases other than above.
Condition
If the fixing temperature at the main switch turning on is 50°C/122°F or above, the value of correction data A applied
when the main switch was last turned off is used.