Copier wont turn on fans are on and green like above sub power switch is on.i have replaced op panel dc and ac power supplies

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.

also check your low-voltage power supply

57.4 Main fan error

Hi I hope this will help

The text come from the hp manual

good luck Ian

Q2431-90912 Chapter 7 Troubleshooting 287

57.X

PRINTER ERROR

To continue turn off then on

or

57.3

EP FAN FAILURE

or

57.4

MAIN FAN FAILURE

A printer fan is not functioning.

X Description

3 EP cartridge fan, right side

(LJ 4300 only)

4 Main cooling fan, left side

Turn the printer off and then on.

57.3 Cartridge fan error (F2)

1. Reconnect the connector

between the fan and the

DC controller PCA

(location J78).

2. Replace the fan. See "Cooling

fan (right side;

HP LaserJet 4300 series

printer only)" on page 170.

3. Replace the

DC controller PCA. See

"DC controller PCA" on

page 181.

57.4 Main fan error (F1)

1. Reconnect the connector

between the fan and the

power supply.

2. Verify that the ribbon cables

are fully seated in the

connectors on the

DC controller PCA.

3. Replace the fan. See "Main

cooling fan (left side)" on

page 168.

4. Replace the power supply.

See "Power supply" on

page 188.

5. Replace the

DC controller PCA. See

"DC controller PCA" on

page 181.

57.7

DUPLEX FAN FAILURE

The cooling fan in the optional

duplexer is not functioning.

1. Turn the printer off and then

on.
2. Replace the duplexer.

Error :
Intermittent E020 / E061 codes.

Workaround :
It's possible that there is a poor drum ground from the static eliminator brush. You may need to replace the static brush with the drum grounding leaf spring from a CLC 350 (part numberFA5-9308-000). Follow the procedure in technical publication CTP.NO 700/800-69.
Error :
E020 sub code 0440 and light density on all colors

Workaround :
Check the developer assembly movement, i.e. up & down and that the magnetic roller is turning. Check the EPC readings, laser output, fold back mirror, and the connectors for the developer and the developer bias contacts. If all the above checks are good, then the problem can be with the AC voltage output of the developer bias HVT. The DC-voltage for the developer bias is split between two colors ( magenta & yellow ) or ( cyan & black ). The AC voltage is supplied for all four colors and it's loss will be seen in all the colors whereas the loss of the DC voltage would affect only two colors. To fix the problem replace the developer bias HVT part # FG5-3068-060.

E000–0061, 0071, 0081


1) Clear ‘E000’. Is ‘E000’ indicated immediately after the power
switch is turned on?
• Be sure to turn off the power switch as soon as you have made the
check.
NO: Go to step 3.


Oil thermistor (TH5), Oil heater thermistor (TH6; short circuit), DC controller PCB
2) Turn off the power switch, and disconnect J6019 from J2209 on the
DC controller PCB. Measure the resistance between a and b of the
following table in reference to the detail code; is it 1 Kω?
Code a b
0061/0081 J6019-B5 J6019-B6
0071/0081 J6019-B10 J6019-B11


AC driver PCB
DC controller PCB
3) Replace the AC driver PCB. Is the problem corrected?
YES: End.
NO: Replace the DC controller PCB.

E5 code refer to fuser unit.To dfisplay both digits press the Enter.
E 52 Fusing error 1 Defective thermistor,heater lamp open,defective main or ac/dc drive board.
E 53 Fusing error 2 thermistor in shortcircuit,fusing harness shorted or ac/dc power supply board defective.
E 54 fusing error 3 main board or ac/dc board defective.
E 55 Fusing error 4 rhermistor open,defective main board or fusing lamp open.
When E5 service call condition occur for safety reasons they cannot be cleared by turn OFF/ON the power switch.After repairing the copier turn ON the main switch.Enter in the SP mode and press 97.Turn the main switch OFF wait 10 sec and turn ON.

Is there power coming out from the supply end
Is is a DC or and AC output supply?
If is it an AC output supply tyhebm in the back of the HP had an AC to DC converted that is realy a diode bridge and should contain a fuse in the circuit somewhere on that board

Sounds like you have a bad capacitor for your squirrel cage fan , now as for the a/c unit sounds like you have a direct short in compressor to ground or leg to leg , check all wiring to make sure that it is not grounding out or melted together.

It could be a cmos battery boot it in bios and check for flagged components, if u do not find anything try it with another power supply as this could several different problems

The problem is a fixing unit abnormality code, could be caused by a bad temp. sensor, build up on sensor or maybe the machine experienced a voltage spike. Power the machine off using main power switch and sub power switch, unplug IP (Image Processor) and any phone lines that may be hooked up.
1) turn on power (both) sub and main while holding down the 2 and 5 buttons on op. panel. a screen will come up.
2) Select 1) software switch setting
3) using the arrows on the screen select dip switch 3-1
4) touch the off key on the LCD to change the data to 0.
5) press return and power equipment off and back on again.
Good luck.