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Re: Canon Error Message
An E805 code has to do with the failure of one of the many fans within the copier. If there is not a dash with four numbers after the 805 code on the display, it is one of two fans - FM1 the transport bed fan or FM9 - the reversing fan just below the fuser assy. There are several checks that can be done but a too lengthy to be described. A tech maybe the best answer depending on your mechanical ability.
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E805- Fan Failure- open rear cover find PSU and check for rotation of cooling fan at power up ( spins as soon as display lights up)
If it isnt spinning - replace with correct part from Canon, the circuit is expecting a feed back specific value which will only be seen with the correct fan.
FM1 Heat discharge fan Cools fixing unit.E805 0000 Fan failure
only one in this copier>
The fan is faulty. -
Check the fan connector.
- Replace the fan.
- Replace the DC controller PCB.
Switching between full-speed rotation and half-speed rotation is controlled as described below.
1) Full-speed control
When the CPU on the DC controller outputs a fan full speed signal (FAN_FULL), the fan drive voltage switching circuit supplies a +24 V fan drive voltage to turn
the heat exhaust fan at the full speed.
2) Half-speed control
When the CPU on the engine controller outputs a fan half speed signal (FAN_HALF), the fan drive voltage switching circuit supplies a +16 V fan drive voltage to
turn the heat exhaust fan at the half speed.
E805-0000 (Main body fan error)
When the cooling fan of the main body starts, the fan lock detection signal (FAN_LOCK) has been held at the "H" level for longer than the prescribed time.
E805 fan error Description With the ITB fan in operation, the machine does not detect a lock state for 5 sec continuously. Remedy Turn off the main power, and check the DC controller PCB; then, turn the power back on. Remarks Disconnected fan connector; absence of lock signal because of fault in fan.
Main cause The cable connector has poor connection. The reader controller PCB is faulty.
Condition 0001 The main controller PCB detects a fault in the communication between the reader controller PCB and the main controller PCB.
1) Connect the cable  for the environment heater.
2) As needed, connect the reader unit anticondensation heater cable .