Sharp Mx-b200 Service Manual

MX-B200    DISASSEMBLY AND ASSEMBLY  8 - 18 1) Remove the E-ring.
2) Remove the bearing.
3) Remove the paper guide unit.
4) Remove the paper exit roller.
D. Set sensor, scan front sensor
1) Remove the set sensor.
2) Remove the scan front sensor.
3) Disconnect the connectors.
* When assembling, attach the blue harness to the marking B side
of the sensor, and attach the orange harness to the opposite side
sensor.
E. Transport roller
1) Remove the actuator.
2) Remove the transport roller.
3) Remove the gear...

MX-B200  ADJUSTMENTS  9 - 1
[9] ADJUSTMENTS
1. Optical section
A. Copy magnification ratio adjustment
The copy magnification ratio must be adjusted in the main scan-
ning direction and in the sub scanning direction. To adjust, use
SIM 48-1.
(1) Outline
The main scanning (front/rear) direction magnification ratio adjust-
ment is made automatically or manually.
Automatic adjustment: The width of the reference line marked on
the shading correction plate is scanned to perform the main scan-
ning (front/rear)...

MX-B200  ADJUSTMENTS  9 - 2 c. Adjustment procedure
1) Set the scale on the document table as shown below. (Use a
long scale for precise adjustment.)
2) Set the copy magnification ratio to 100%.
3) Make a copy on A4 or 81/2 x 11 paper.
4) Measure the length of the copied scale image.
5) Calculate the sub scanning direction copy magnification ratio
using the formula below.
6) Check that the actual copy magnification ratio is within the
specified range. (100 ± 1.0%).
If it is not within the specified...

MX-B200  ADJUSTMENTS  9 - 3 2) Execute SIM 50-01
3) Set the print start position (AE lamp ON) (A), the lead edge void
amount (TEXT lamp ON) (B), and the scan start position
(PHOTO lamp ON) (C) to 0, and make a copy of a scale at
100%.
4) Measure the image loss amount (R mm) of the scale image.
Set C = 10 X R (mm). (Example: Set the value of C to 30.)
When the value of C is increased by 10, the image loss is
decreased by 1mm. (Default: 50)
5) Measure the distance (H mm) between the paper lead edge
and the...

MX-B200  ADJUSTMENTS  9 - 4
2. Copy density adjustment
A. Copy density adjustment timing
The copy density adjustment must be performed in the following
cases:
 When maintenance is performed.
 When the developing bias/grid bias voltage is adjusted.
 When the optical section is cleaned.
 When a part in the optical section is replaced.
 When the optical section is disassembled.
 When the OPC drum is replaced.
 When the main control PWB is replaced.
 When the EEPROM on the main control PWB is replaced.
 When...

MX-B200  ADJUSTMENTS  9 - 5 3) Make a copy.
Check the adjustment level (shown in the above table) of the
exposure test chart (Sharp Gray Scale).
(When too bright):Decrease the value displayed on the copy
quantity display.
(When too dark):Increase the value displayed on the copy quan-
tity display.
* The value can be set in the range of 1 - 99.
3. High voltage adjustment
A. Main charger (Grid bias)
Note:
 Use a digital multi meter with internal resistance of 10MΩ or
more measurement.
 After adjusting the...

MX-B200  ADJUSTMENTS  9 - 6
5. SPF mode sub scanning direction 
magnification ratio adjustment (Option)
Note:Before performing this adjustment, be sure to check that the
OC mode adjustment in copying has been completed.
1) Put a scale on the original table as shown below, and make a
normal copy (100%) on the front and the back surfaces to
make a test chart. 
Note:Since the printed copy is used as a test chart, put the scale
in paralled with the edge lines.
2) Set the test chart on the SPF and make a copy...

MX-B200  SIMULATION, TROUBLE CODES  10 - 1
[10] SIMULATION, TROUBLE CODES
1. Entering the simulation mode
To enter the serviceman simulation mode, press the keys as fol-
lows:
[Clear] key 
→ Exposure mode selector key → [Clear] key → 
Exposure mode selector key 
2. Key rule
3. List of simulations
[] [] key:Entry of MAIN CODE/SUB CODE
Setting of the adjustment values for the 
adjustment-related simulations
When [%] key is pressed simultaneously, the 
value is displayed in the descending 
sequence such as...

MX-B200  SIMULATION, TROUBLE CODES  10 - 2
4. Descriptions of various simulations
Main 
codeSub 
codeContents Details of function/operation
1 01 Mirror scan operation[Function]
When [OK]/[START] key is pressed, the home position is checked and the mirror base performs
full scan at the speed of the set magnification ratio.
During operation, the set magnification ratio is displayed.
The mirror home position sensor status is displayed with the Drum replacement required lamp .
(When the mirror is in the home...

MX-B200  SIMULATION, TROUBLE CODES  10 - 3 5 01 Operation panel display 
check[Function]

When [ENTER/START] key is pressed, the LED on the operation panel lights up in all pixels.
The status display is as follows:
 After all ON (5 sec)
7seg panel model: 
Returns to the sub code input standby (Sub code blinking).
 During LED check mode (All ON)
7seg panel model: 
When [1 UNIT UP] key is pressed, the machine goes into the individual lighting mode. 
When [C] key is pressed, the machine enters the sub code...