How to reset counter or access service menu? After certain amount of printed pages LED indicates "drum has to be replaced". I am sure that this is too early. Because it likes to print clear pages (e.g. if in duplex print mode computer sends only one page to printer, which is printing nothing to other side of paper page). Only temporarily I want to simulate the drum replacement. Thanks...

Solution 1: Replace the Waste Ink Absorber
Step 1: Press the Power Button
* With the Canon Printer Powered off but connected to a power source. Press the "Power" button while pressing and holding the "stop/reset" button.
Step 2: Press the Stop/Reset Button
*When the Power is lit, press the "Stop/Reset" button two times
*While pressing and holding the "Power" button
Step 3: Move Into a Service Mode
*When releasing the "Power" button and the "Stop/Reset" button (regardless of order), the printer will move into a service mode. (waiting for menu selection)
Step 4: Press "Stop/Reset" Button
*When the on/off lights in green, press the Stop/Reset button the specified number of time(s) according to the function listed in the table below.
(Each time the "stop/reset" button is pressed, the LED lights alternately in orange and green, starting with orange)
Note: Make sure there is need to press 4 times for waste ink counter reset
The number of the Reset button pressing LED Function Remarks
*0 time Green Power off
*1 time Orange Service pattern print
*2 times Green EEPROM print
*3 times Orange EEPROM reset
*4 times Green Waste Ink counter reset

Step 5: Turn on Canon Printer
Turn off the printer, then turn it on again.

Now Check the Canon printer error code 5800 is resolved. If not, then go to the next solution.

Solution 2: Enter Canon Printer in Service Mode, works best for multifunctional printers.

Step 1: Turn Off Canon Printer
Step 2: Go to Press the Menu Option
Step 3: Put Printer in Service Mode
*To do this you will have to press the "SCAN", "COPY" and "SCAN" buttons in that exact order.
Step 4: Reach to the "Counter Access" option
Step 5: Check amount of pages that you are printed
Press the "ok" key
Step 6: Press the "COPY" Button
Step 7: Score all the way to zero
Step 8: Stop once get "Scan Page Count" Option
Step 9: Set Score back to zero
Step 10: Press the "STOP/Reset" button
Step 11: Turn Off "Stop/Reset" button
Step 12: Disconnect the Power Cables and reconnect

The problem with this is the design. Each toner cartridge has a microchip on it, that counts the pages you print. The company has determined that you get x amounts of prints. Then you have to replace it, empty or not. This printers do not work the same way as an expensive professional business copier. In an pro style there is a spent toner cartridge that collects all of the wasted toner that is on the drum. On a small business/home style this spent toner goes back into the cartridge. There is no level indicator, even on the inkjet printer. They too, have a chip that says you have x amount of prints/cleaning cycles they can go through. Look up inkjet refill kits or inkjet cartridge programmer.

There were instructions with the new drum cartridge that explained how to reset the drum counter. If you still have the box and paperwork, then go through that step-by-step and reset the counter. The machine still thinks that it has the old drum. After a certain amount of copies or prints, the machine will save itself by turning off the printer or copy functions.

(from Okidata's support site)

After replacing the image drum cartridge, reset the drum counter to keep a correct count of the number of pages printed on the image drum.
1. Turn the printer on while holding the MENU 1/Menu 2 button. USERMNT displays in the control panel window.
2. Press MENU 1/Menu 2 three times. DRUM CNT RESET displays.
3. Press ENTER. The counter will reset and the printer will go ON-LINE.

After replacing the image drum cartridge, reset the drum counter to keep a correct count of the number of pages printed on the image drum.
1. Turn the printer on while holding the MENU 1/Menu 2 button. USERMNT displays in the control panel window.
2. Press MENU 1/Menu 2 three times. DRUM CNT RESET displays.
3. Press ENTER. The counter will reset and the printer will go ON-LINE.

In the printer software there is a counter that after printing a certain amount of pages (depending of the printer model) will display the error message and block all printing. The solution is to reset the counter to 0.
Download the http://www.ssclg.com/download/sscserve.exe (its free) once download completed click on the sscservve.exe to launch the setup of SCC service utility. When you close the program, a printer icon should appear on you taskbar.
Using the application:
Right click on the printer icon:
Among the different options provided select the Protection counter option.
Select the Show current value option. You should obtain information about the current value (number of pages already printed) and maximum value.
If the current value is greater than the maximum value, this indicates that the problem is due to the number of pages already printed.
Reselect the Protection counter option, click on the Reset protection counter and then on Clear Counteroverflow option.
The current value should be reset to 0
Restart your PC , your problem should be solved.

Reset the Drum Count:
 
Open the Status Monitor. 
Click Printer Setup tab. 
Click on Printer Menu button 
Click the Maintenance tab 
Click on the Drum Counter Reset button.

Mp150
Reset Counter
Service mode operation procedures -
1) With the printer powered off but connected to a power source, press the Power button while pressing and holding
the Stop/ Reset button.
2) When the Power LED is lit, press the Stop/Reset button two times while pressing and holding the Power button.
3) When releasing the Power button and the Stop / Reset button (regardless of order), the printer will move into a
service mode. (Waiting for menu selection)
4) When the LED lights in green, press the Stop/Reset button the specified number of time(s) according to the
function listed in the table below.(Each time the Stop/Reset button is pressed, the LED lights alternately in
orange and green, starting with orange.)
The number of the Reset
button pressing
LED Function Remarks
0 time Green Power off
1 time Orange Service pattern print
2 times Green EEPROM print
3 times Orange EEPROM reset
4 times Green Waste ink counter reset See waste ink counter reset
procedures below.
5 times Orange Destination setting See Destination setting
procedures below.
6 times Green Print head deep cleaning
11 times Orange Button / LCD checking
12 or more times Returns to a menu selection

if the Drum LED is still lit after replacing the drum unit, the Drum counter may not be reset.
Reset the Drum counter as follows:

1. Open the front cover.
2. Locate the control panel button under the LED lights on the left side.
3. Press the control panel button until all lights are lit, then release it.
   The Drum counter is now reset.