Code e7 the copier displays a an error code E7 when power on for 3-4 minutes

The error is an 'EL' code. This is a problem with the spin motor. You will need to get a repair specialist to look at it.

For proper understanding of the error meainig it is necessary to obtain a Subcode of the error by pressing START at the moment of displaying error. E7-02 and E7-16 means Laser unit problems, E7-01 problem with memory, E7-10,11,12 Scanner problems

Here is a list of error code meanings for your device. You need to find out the sub code should be E7-?? To find the root cause. Sharp AR 161 Error Codes Trouble Codes

E7

E7 03 LSU trouble
E7 04 CCD white level trouble
E7 05 CCD black level trouble

Feature : E7 Error code on indoor unit display panel

• Answer :Reason:
  Communication fault between indoor and outdoor unit
  Solution:
  This may be caused by:
  1.wrong connection of cable,
  2.indoor PCB, outdoor PCB fault, or power module fault
  3.cable connection loose
  

try this link
http://www.singerco.com/accessories/instruction-manuals

Sharp copier AR5516 not working. Error code E 7 kindly help.

Dear Sir i have an prestige induction cook top model PIC 3.0 the problem is that it displays an E7 error whenever switched on after appx. 1 minute and the food is not boiled /cooked. please let me know what is the problem How Can Solved this Problem This prestige induction cook top model PIC 3.0 Only one week so please do need full

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Check this out :
E7 codes deal with the optical scanner unit and or the laser unit. It could also be the lamp in the scanner unit. The E7 is the main code. There is a sub code associated with it. To view the sub code hold down the start button. Below is a list of specific codes and their meanings:
E7-02: LSU trouble
E7-10: Shading trouble (Black Correction)
E7-11: Shading trouble (White Correction)
E7-12: Shading Trouble
E7-16: Abnormal laser output
If it is a laser (LSU) issue then the LSU may need replacing.
If it is a shading error the first step is to remove the platen glass carefully (with the power off because the inverter board). There is a thin white strip on the bottom side of the platen next to the **** glass. Clean this white strip with a soft cloth and a small amout of isopropyl alcohol.
Dust on the optics can also cause shading reference errors so gently blow off the mirrors with canned air.
Perform the following key procedure to reset error:
"#" key, Interrupt key, "C" key, Interrupt key
"1" key, "4"key
Start key, "CA" key.
See if unit cycles and comes back up. If not turn off and then back on the main power.
If error reappears on site technical service may be required.

Could you be more specific? e7-03 is trouble in your laser unit, e7-04 is dirt on your inside white strip which helps your copy lamp find the home position, and e7-05 is trouble with your copy lens.

E7 codes deal with the optical scanner unit and or the laser unit. It could also be the lamp in the scanner unit. The E7 is the main code. There is a sub code associated with it. To view the sub code hold down the start button. Below is a list of specific codes and their meanings:
E7-02: LSU trouble
E7-10: Shading trouble (Black Correction)
E7-11: Shading trouble (White Correction)
E7-12: Shading Trouble
E7-16: Abnormal laser output
If it is a laser (LSU) issue then the LSU may need replacing.
If it is a shading error the first step is to remove the platen glass carefully (with the power off because the inverter board). There is a thin white strip on the bottom side of the platen next to the slit glass. Clean this white strip with a soft cloth and a small amout of isopropyl alcohol.
Dust on the optics can also cause shading reference errors so gently blow off the mirrors with canned air.
Perform the following key procedure to reset error:
"#" key, Interrupt key, "C" key, Interrupt key
"1" key, "4"key
Start key, "CA" key.
See if unit cycles and comes back up. If not turn off and then back on the main power.
If error reappears on site technical service may be required.