Whites DFX repair?

[Geoffn]

Hi, a friend has fried his Whites DFX with a reverse polarity battery.
Are there any circuit diagrames or repair blogs avalable?
Currently reading the xlt repair posts which may give me some pointers.
Thanks
Geoff

[kt315]

you can load whole block of whites VLF schematic https://dfiles.ru/files/88n8zxpc2?redirect

[Geoffn]

hi thanks for the files ,a lot to look through.

[crni1]

I had the same problem with the Whites DFX, it had a cold bundle code - a battery contact and when I replaced the LP2951 and the LM2936-5 detector was working.

[kt315]

hi thanks for the files ,a lot to look through.

all files resorted in the folders. look folder DFX.

[Geoffn]

[QUOTE=crni1;240775]I had the same problem with the Whites DFX, it had a cold bundle code - a battery contact and when I replaced the LP2951 and the LM2936-5 detector was working.[/QUOTE
Thanks for the information . I will get them ordered.

[Geoffn]

Hi Sorry I can see a xlt folder but not a dfx folder?

all files resorted in the folders. look folder DFX.

[crni1]

I used this one.

[Davor]

Once you fix it, put something like this instead of a power-on switch. It acts both as a crackling prevention, and as a polarity protector.

[Geoffn]

I was going to put a diode in series as protection but your idea looks better idea.

[Davor]

I like it because if everything is OK it will pass the battery voltage with virtually no drop at all.

[kt315]

delete all you loaded earlier. load new one. http://depositfiles.com/files/dxytjcm89

[Taktyk]

This is a problem to load the schematic here? Detector is no longer produced...

Regards
TAKTYK

[kt315]

to load all fabric schematics here is my sacramental dream. anybody has to do that.

[Geoffn]

Hi , I finally got hold of the dfx .It was totality dead so I replaced is u6 u7 an u8 the voltage regulators. Now the dfx turns on and the display is normal.
BUT it bleeps about every second and when a key is pressed once its as though its being pressed a number of times repeatedly. No debounce ? . trying to scroll through the menu is possible but eratic.
Any ideas ?