Error code 500 dsm618d how do i clear this code or fix it

try clearing cache? go to preferences/settings and find clear cache.

Clean or change the charge roller.

How to Fix Gmail Temporary Error 500: Gmail Access Problem?
The Gmail Error 500 is the most common error which Gmail users face on frequent basis because of some severe server configurations issues. In web world, the Gmail Error 500 truly indicates an Internal Server Error message and occurs while the server encounters an unexpected condition to prevent it from fulfilling the request. The issue is not only confined to the Gmail accounts. According to Outlook technical support professionals, one can check this by simply logging into a friend's account from the same computer.The issue is further not limited to the computer or network itself but yes one can easily perform a check by trying to log in from a different computer or even from a network.
Steps to fix the Gmail Temporary Error 500
Step1: Browser Cache Issues
Generally clearing our browser's cache as well as cookies can easily fix out most of the issues a user is facing with the Gmail account. Therefore the first attempt to resolving a Gmail Login issue should be that of clearing out cache files of the web browser. If a user is using the Firefox, Google Chrome or even the Internet Explorer a user can clear cache by pressing the Ctrl+Shift+Del button.
Step2: Conflicting Browser Extension/Toolbars
An improperly coded browser extension which users may have recently installed could be the main cause of it which is stopping users from accessing a Gmail account. One can easily check this out by working with the browser in the "Safe Mode" section. If a user is using the safe mode then, simply click on the "Firefox Menu > Help > Restart" button with the Addons Disabled.
Step3: Internet Security applications such as Firewall, Antivirus
Ensure that the internet security applications such as Firewall, Antivirus are not at all interfering with the Gmail account. Different antivirus software that may have different settings for the internet usage, but as a general rule, one can surely check the following settings as described below by Outlook tech support team of experts:
?Privacy/Firewall/Allowed sites
?Make sure that you have added a mail.google.com/mail to all the allowed sites.
?Cookie Control session
?Internet Security Toolbar - Disabling of all the internet security toolbars is required that users may have installed.

Step 4: Gmail Sever Issue
Gmail is accessed by hundreds of data centers across the world which undergoes a regular maintenance shut downs sessions. While a selected data centers are not undergoing any maintenance phase, the Gmail accounts are entirely served by another data centre. In such cases, users won't be the only person who is affected and then can be sure enough of the fact that the people at Gmail would be easily trying their best to run as early as possible. Here, users need to perform a check back of the Gmail account after a few hours.

If none of these above methods solve your purpose then do give us a call at Toll-Free 1-800-213-8289 our Outlook Customer support section for instant help service. We will right be there at your doorstep by delivering you an ultimate as well as advanced solution to your problem

Hello,
The E001-004, means:

The difference in temperature between the
non-contact thermistor and the end thermistor
remains 80°C or more for 500
msec.

... so, that means, that you have trouble in fixing assy.

You can try to reset the error code in service mode.
1) Press the asterisk key ( * ) on the operation panel.
2) Press 2 and 8 simultaneously on the numeric keypad.
3) Press the asterisk key ( * ) on the operation panel.
The initial screen now appears.
Select:
COPIER-FUNCTION-CLEAR
1) Select this item, and press the OK key.
2) Turn the main power OFF/ON.

If still after the clearing procedure, error still persist, You need to replace the fixing assy.

Hope that helps!

Install a new firmware, or
When installing the FCU, slowly and carefully connect the MBU to the FCU to
ensure a proper connection.
! If the connection is not properly established, the fax option may not be detected
and/or SC820 may occur.

u have to go sp mode and clear the memory. to enter sp mode press the yellow botton once and press 107 and hold down the the red botton after some seconds it will enter the sp mode move to 5 mode scroll to clear memory and press ok

That is a rather general error from an internet server. They usually occur when you are visiting a web page that can't be displayed properly due to errors in the code, in this case, they were trying to display HTML code from their system directly in your email. If it came in a spam email, you don't need to worry about it.
If it came from a company or person that you needed to see what they were sending you, contact them and tell them you got a 500 server error, and forward them the email so they can figure it out. It will have to be fixed on their end