Power-on
self test (POST) sequence on Lexmark X746 and X748 MFP
When
you turn the printer on, it performs a Power-On Self-Test. Check
for correct POST functioning of the base printer by observing the following:
1.
The operator panel turns on and displays the Lexmark logo.
2. A
progress bar displays.
3.
The LED turns on.
4.
The main fan turns on.
5. The
machine performs the following tests: a. Sensor check b. Motor
check—initializes the following motors:
i. Cam motor
ii. EP drive motor
iii. Fuser motor
iv. Cartridge motor c.
Supplies
check
Note:
The LED blinks red and an error message displays on the operator panel screen
if the machine detects errors during these test phases.
6.
The LED light indicator blinks.
7.
The loading screen displays.
920.26—POST
service check
1. Open
the top access cover.
Is the top cover
sensor damaged?
Solution:
Replace the top cover sensor
2.
§ Turn the
printer off.
§ Remove the
rear frame cover.
§ Check the
cable in the connector JFDS1 for proper connection to the system board, pinch
points, and the cable or connector for any other damage.
Is the cable
damaged? Solution: Replace the top cover sensor
3.
§ Disconnect
the cable in connector JFDS1.
§ Connect the
new top cover sensor.
§ Enter
Diagnostics mode (press and hold buttons 3 and 6, turn on the MFP, and release
the buttons when the progress bar displays.
§ Touch Sensor
Tests.
§ Touch Dynamic
Sensors.
§ Touch Top
Door.
§ Activate the
top cover sensor by pressing the flag as shown.
Does the display on the touchscreen change from Open to Closed?
Solution: Replace the Systemboard
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920.27,
920.28, 920.29—POST (power on self-test) option tray error service check
1. Is
the specified option the 550-sheet tray?
Solution:
Replace the 550-sheet tray with a new 550-sheet tray option.
2. Is
the specified option the special media tray?
Solution:
Replace the special media tray with a new special tray option
3. Is
the specified option the high-capacity input tray (HCIT)?
Solution:
Replace the HCIT controller board assembly
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920.32—MPF
paper present sensor not connected service check
1.
Check the cable in connector JMPFPP1 for proper connection, reseat cable. Did
the error clear?
2.
- Check the
connection on the paper present sensor side.
- Check for
damage and pinch points on the cable.
- Reseat cable.
Solution: If No go, Replace
the MPF paper present sensor
_________________________________________________________________________
925.01,
925.03, 925.05—Fan error service check
1.
Turn the printer off.
Remove the rear frame cover.
Check the cable in connector JFAN1 for proper connection to the
system board, for pinch points, and for any other damage to the cable or the
connector.
Is the cable damaged? Solution: Replace the
fan
2.
Measure the continuity across all the fuses on the system board.
Are any of the fuses blown? Solution:
Replace the Systemboard
3
§ Turn the printer off.
§ Remove the rear frame
cover.
§ Check the cable in
connector JBLW1 for proper connection to the system board, for pinch points,
and any other damage to the cable or connector, and reseat the
cable.
Did the error clear? Solution: replace the Systemboard
_________________________________________________________________________
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