Printer Letter "H" and number "4" appears in the display. On turning off the power switch and waiting for 10 seconds and then turning on the switch again, does not clear the message "H" and "4"

if the code does come back DO NOT RESET the machine again! It is indicating a problem the code you are resetting is the fuser and it can catch on fire! That will ruin a perfectly good day!!!
ENSURE YOU WAIT 10 SECONDS

1. Turn OFF the main power switch. (Located inside machine) Leave control power switch in the on position.)
2. Turn main power switch ON while pressing the Utility/Counter key.
3. Touch [Trouble Reset].
4. Check to make sure that [OK] is displayed and the it has been reset.
5. After turning off the main power switch, turn it on again more than 10 seconds after and check if the machine starts correctly.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

The Fuser is not turning... follow these steps
1. Turn OFF the main power switch.
2. Turn main power switch ON while pressing the Utility/Counter key. Keep holding it till the T reset appears
3. Touch [Trouble Reset].
4. Check to make sure that [OK] is displayed and the it has been reset.
5. After turning off the main power switch, wait 10 seconds and turn the machine back on, this should reset the service code and with any luck the machine will run!



I’m happy to help further over the phone at https://www.6ya.com/expert/ron_9356d26241d4cbf7

Please check the information that came along with the owner's manual. It should be printed on a card that comes with those booklets. I assume you've already done that though. I've attached the procedure for entering the code below. Let me know if you have any trouble with it.

If the radio is disconnected from the power supply it is not ready for operation when reconnected. After switching on the ignition and the radio the word "CODE" appears on the display and the letter "C" flashes.

NOTE: The five-digit code number for this radio is printed on the CODE CARD which you were given.

Enter the code number with station buttons, e.g. number 1, station button 1.

After entering the first digit the word "CODE" disappears and the digit entered is displayed followed by 4 dashes. The next digit to be entered flashes. After all 5 digits are entered, the first digit flashes again. In this state the code number can be written over repeatedly. A correction can be made only by reentering the entire code number.
Confirming the code number: Press seek-UP/seek-DOWN or SCAN button. The radio switches on automatically and displays the station or frequency stored for station button 1.

If the wrong code number has been entered and confirmed, the word "CODE" appears on the display again. After the code has been entered three times incorrectly the word "WAIT" appears on the display and the radio is disabled for approx. 10 min .

NOTE: The waiting time continues to run only when the radio is switched on.

After expiration of the waiting time the word "CODE" appears on the display again and the correct code number can be entered. After 3 more incorrect entries the radio is again disabled for 10 min . After 3 more incorrect entries (a total of 9 incorrect entries) the waiting time is increased to 60 min . After 3 more incorrect entries the radio locks up again for 60 min .

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Please reset the printer

1. Turn off your printer
2. Press and hold the STOP/RESET button
3. Press and hold Power ON button
4. While holding the Power ON button, release the STOP/RESET button
5. While holding still the Power ON button, press twice the STOP/RESET button
6. Release the Power ON button
7. Wait until it display an "idle" message. It will take about a minute.
8. When "idle" appear, open the top cover to expose the cartridges.
9. Lift up the cover for cartridge holder and take out both the black and color cartridges
10. Return the cover of cartridge holder and turn off the printer
11. Return the top cover and turn on the printer again
12. After the printer initialize, return the cartridges.

1. Press and Hold the STOP/RESET button and wait until it self restart.
2. Release the STOP/RESET button the the printer is restarting.
3. Wait for a few seconds

Some basic reset procedures.

A. Open and close the front door.
B. Power off the machine, wait 30 seconds power on.
C. Power down the machine, unplug from the wall for 1 minute, plug in and power on.

D. 13.1 Trouble resetting
1. Turn OFF the Main Power Switch.

2. Turn Main Power Switch ON again while pressing the Utility/Counter key more than 10 seconds after.

3. Touch [Trouble Reset].

4. Check to make sure that [OK] is displayed and the it has been reset.

5. Turn off the Main Power Switch and turn it on again more than 10 seconds after, and make sure that the machine properly starts.

Please reset the printer

1. Turn off your printer
2. Press and hold the STOP/RESET button
3. Press and hold Power ON button
4. While holding the Power ON button, release the STOP/RESET button
5. While holding still the Power ON button, press twice the STOP/RESET button
6. Release the Power ON button
7. Wait until it display an "idle" message. It will take about a minute.
8. When "idle" appear, open the top cover to expose the cartridges.
9. Lift up the cover for cartridge holder and take out both the black and color cartridges
10. Return the cover of cartridge holder and turn off the printer
11. Return the top cover and turn on the printer again
12. After the printer initialize, return the cartridges.

1. Press and Hold the STOP/RESET button and wait until it self restart.
2. Release the STOP/RESET button the the printer is restarting.
3. Wait for a few seconds

To clear error 5100 clean the surface of the copper contact of the ink cartridges with a moistened cloth and let it air dry. Fix the cartridges to the holder and return properly the cover of the printer.

These 2 reset procedures will help you clear the errors displaying in the control panel of the printer and let you print again.

To clear U053, U051 and U052
1. Turn off your printer
2. Press and hold the STOP/RESET button
3. Press and hold Power ON button
4. While holding the Power ON button, release the STOP/RESET button
5. While holding still the Power ON button, press twice the STOP/RESET button
6. Release the Power ON button
7. Wait until it display an "idle" message. It will take about a minute.
8. When "idle" appear, open the top cover to expose the cartridges.
9. Lift up the cover for cartridge holder and take out both the black and color cartridges
10. Return the cover of cartridge holder and turn off the printer
11. Return the top cover and turn on the printer again
12. After the printer initialize, return the cartridges.

To clear error U162 or U163
1. Turn off your printer an turn it on again
2. After the printer initialize try to copy or print. The error will appear.
3. When the error is displayed on the display panel of the printer, Press and Hold the STOP/RESET button and wait until it self restart.
4. Release the STOP/RESET button the the printer is restarting.
5. Wait for a few seconds and the pending print jobs will commence.

To disable ink low detection, do this steps:
1. Turn off your printer
2. Press and hold the STOP/RESET button
3. Press and hold Power ON button
4. While holding the Power ON button, release the STOP/RESET button
5. While holding still the Power ON button, press twice the STOP/RESET button
6. Release the Power ON button
7. Wait until it display an "idle" message. It will take about a minute.
8. When "idle" appear, open the top cover to expose the cartridges.
9. Lift up the cover for cartridge holder and take out both the black and color cartridges
10. Return the cover of cartridge holder and turn off the printer
11. Return the top cover and turn on the printer again
12. After the printer initialize, return the cartridges.

To disable detection of reused cartridge, do this step:
1. Turn off your printer an turn it on again
2. After the printer initialize try to copy or print. The error will appear.
3. When the error is displayed on the display panel of the printer, Press and Hold the STOP/RESET button and wait until it self restart.
4. Release the STOP/RESET button the the printer is restarting.
5. Wait for a few seconds and the pending print jobs will commence

Please find the complete explanation in my tips in this link
http://www.fixya.com/support/r5191523-canon_pixma_mx320_disable_ink_cartridge

Check,clean and measurement the continuity of the fusing unit parts(heater lamps,thermistors,thermofuses) and reset the trouble code.Enter in the service mode :press total clear (yellow)key-107-and press and hold the clear (red)key more 4 second.If the SP mode appears to the display press the windows,open the front door and turn OFF the main power switch.Unplugged the machine,wait 10 seconds ,plugged on ,closed the front door and turn ON the power switch.

This sounds like a Phillips Car Stereo:

To get the code in:
1. Turn the stereo off.
2. Turn off the ignition
3. Turn the ignition back on (dash warning lights on)
4. Hold and keep down the AS button on the stereo.
5. Turn the stereo on.
6. Release the AS button after 4 dashes appear on the display
7. Now enter code (if code = 7009. Press preset button 1 seven times, button
2 once
3 once
4 nine times
If you go past you can go round again by pressing the
preset button repeatedly
8. Once all 4 numbers are correct hold down AS again until you hear a beep (2 - 5 seconds)
9. The stereo after beeping will scan to program channels
You have 10 attempts to get the code in. However some models will not give you the number of attempts remaining!

Time delays work as follows:

Attempt 1. 10 seconds
Attemp 2. 30 seconds.
Attempt 3. 10 minutes.
Attempt 4. 20 minutes
Attempt 5. 40 minutes
Attempt 6. 80 minutes
Attempt 7 160 minutes
Attempt 8 320 minutes
Attempt 9. 640 minutes (yes that is 10 hours 40 minutes!!)

Vitally important thing to remember, the countdown timer works only when the radio is switched on. ANY interruption in the power will reset the timer!

So, be prepared for a VERY long wait to be able to enter the code!
Oh, and if it has reached 10 attempts, then it needs a dealer unlock.