MXM850 trouble F4-38

[Smrekca]

Hi,
i have problems with a Hercules MX-M850. when i turn it on, the machine gives me an F4-38 trouble. this should be an 38V problem. did anyone has got the same problem and how can i solve it?
plese help?
Thanks

[bonnie750]

from the manual.


Detail 38V voltage fall or 38V disconnected.
Section PCU
Cause Connection failure or disconnection of the connector
and the harness.
PCU PWB trouble.
Power unit trouble, or blown fuse.
HL PWB trouble. (relay)
Check &
Remedy
Check the connector and the harness of the power line.
Check the power voltage of 38V in the power unit and
the PCU PWB.
Check for blown fuse in the power unit.

(Main power: F208


Bill

[OMD-227]

Check the HL pwb. CN6 pins 1,2,3 should have 38V, CN7 pins 6,7,8,9,10 should have 38V.
The main power supply, powers the HL pwb. Check fuser 208 on the main power supply.

Havent had this one myself yet, but keen to know the outcome.

[Smrekca]

hello,

i have checked all the fusers and they are all ok, i changed the hl pwb but no success. do you think that the main power supply is damaged?

i think i will have to order one to check, becuose it is my only such device.

thanks

[OMD-227]

Yes, replace the main power supply. A check of the circuit diagram shows that all 38v lines come off that board. That is more likely than the PCU board being bad & not detecting the 38v line.
Did you check the pins I listed above? That is the incoming 38v line to the HL pwb from the main power supply. It should be a dead giveaway.

[OMD-227]

Any chance of an update on this one?

Would love to know what the problem was, incase I see it here too.

[Smrekca]

hello,

sorry for my late reply.
i changed the main power supply and the trouble dissapear.

thanks for help wazza

BR

[spardigas]

Re: MXM850 trouble F4-38

can anyone give the part number for the power supply

[spardigas]

Re: MXM850 trouble F4-38

no one knows where i can get a main power supply for mx-1100

[mloudy]

Re: MXM850 trouble F4-38

I spent a while looking for it in the Parts Manual but could not find it. I am sure it is in there but Sharp doesn't always name their parts what I think they should be. As I don't work on this model I also do not know where it is to be able to visually find it in the diagrams.