avantra 25 door open error

[Didos]

HI,
I have the problem on the avantra 25 processor:
when I suitch on it display DOOR OPEN message and I checked all
suitchs for door security are well closed I do not know what to do
again,please anyone can help me?

 

[VladCanada]

How did you check top cover safety switches?
Visually or checked the circuit with multimeter?
Ask any electrician guy to check switches and wires - that's a piece of cake.

 

[Didos]

HI,
Vladcanada,I am electrician,I used the multimeter to check
all circuits wires from suitches untill the power distributor board
where they are connected and I even tried to ignore suitches and short
them but no result.Please if there is another resolution you can help me.

 

[VladCanada]

Check plug X2 at LUTH Power Board (with 6 relays in a row and 5 blue transformers) in golden box.
X2 located at bottom-right corner of that board. X2 has 2 pins connector.
You probably lost the plug over X2.
Just make a short cut of that 2 pins to see DOOR OPEN msg disappeared.

 

[techno]

look for bridge rectifier on relay board
it may be open circuit
it provides 12v dc to cooling fan and scavenger fan and door circuit
are these fans running? if not, it is the bridge rectifier.

 

[Didos]

thanks Vladcanad and Techno for your help.
But while I was thinking to do what you told me to do the
processor stoped to respond and I checked on the main board LCB 01
the output voltage on the regulator LM2925 is ok(5v dc)and I tried to replace
the smal capacitor near the regulator but no result it still displays:GI ATB VO3 LUTH
on boot up.Please if there is another advice you can help me.

 

[VladCanada]

Check lithium tablet battery at CPU board as well.

 

[techno]

looks like you now have a seperate fault,was the cpu powered down for more than two days?try to gently heat cpu board with hairdryer while powered up,it might boot up,

 

[VladCanada]

Heating of CPU is a backdoor way to increase the capacity of fault capacitor.
He replaced that capacitor, so that's another issue.

 

[Didos]

I checked the lithium batteries and is ok:it has (3V dc).I tried even to put a new one
but the problem is still the same.And I tried to disconect all others cables except
that one for ATB(display pannel) and the other one for the power but there is no result.

 

[VladCanada]

A few times the root of issue was Z80PIO
chip at CPU board.
That's your last hope, otherwise buy new board.