Trying to fix a Garmin sat nav. Can't identify the reed switch. Pic attached - Page 2 - Electronic Circuits Projects Diagrams Free

gazzarose · 11th October 2009, 08:08 PM

Heres some more pics. It shows both sides of the aerial board, and the position that the aerial is in when closed and open. The last photo is a closeup of the area under the aerial hinge. I can't see anything on the aerial board that looks like a magnet tho.

http://c3.ac-images.myspacecdn.com/i...77f15fbb26.jpg

Sceadwian · 11th October 2009, 08:18 PM

That looks suspiciously close to that button there.. Check the button with a meter on continuity setting to see if it still works.

gazzarose · 11th October 2009, 08:22 PM

the button does work, but it just resets the whole unit, when its in its case the button is protected from accidental pushing and the aerial doesn't touch it, when I took it apart I was expecting to see some kind of micro switch or something but theres nothing there, so it must be a proximity sensor of some kind.

cobra1 · 11th October 2009, 09:06 PM

im going to stick my neck out here and say that the 3 legged ic to the upper right of the white push button is going to be your hall sensor.

can you get something metal (steel) not stainless though and move it around the black shroud covering the ribbon cable. just to see if there is a maget in there

is there anything written on that ic i mentioned??

gazzarose · 11th October 2009, 09:25 PM

I can't seem to find a magnet anywhere, I took the black shroud off the aerial board and its just covering the connector for the ribbon cable.

I think it says A5XGC on the IC, but I can't be certain. I havn't got a magnitfying glass so I can't get close enough.

gazzarose · 28th October 2009, 09:39 PM

Sorry to ressurect an old thread, but I think I've made some slight progress. I turned the sat nav on a few days ago, and the 'gps is off' message had gone, and I can now view the satellite status page, but it doesn't show any satellites. I had a play, but then found that the ribbon cable thats in the black shroud on the cable had come out. So that tells me that the 'switch' to turn the aerial on and off is in the aerial itself. If i knew what wire to cut I may be able to get it working. I just don't fancy guessing at it,lol.

I may have to peel the tin foil off the back of the aerial and have a look inside.

Gareth

Sceadwian · 29th October 2009, 12:55 AM

How many wires are on that ribbon cable that goes to the Aeriel?

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11th October 2009, 08:08 PM	#16
gazzarose	Heres some more pics. It shows both sides of the aerial board, and the position that the aerial is in when closed and open. The last photo is a closeup of the area under the aerial hinge. I can't see anything on the aerial board that looks like a magnet tho. http://c3.ac-images.myspacecdn.com/i...77f15fbb26.jpg

11th October 2009, 08:18 PM	#17
Sceadwian	That looks suspiciously close to that button there.. Check the button with a meter on continuity setting to see if it still works. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

11th October 2009, 08:22 PM	#18
gazzarose	the button does work, but it just resets the whole unit, when its in its case the button is protected from accidental pushing and the aerial doesn't touch it, when I took it apart I was expecting to see some kind of micro switch or something but theres nothing there, so it must be a proximity sensor of some kind.

11th October 2009, 09:06 PM	#19
cobra1	im going to stick my neck out here and say that the 3 legged ic to the upper right of the white push button is going to be your hall sensor. can you get something metal (steel) not stainless though and move it around the black shroud covering the ribbon cable. just to see if there is a maget in there is there anything written on that ic i mentioned?? Last edited by cobra1; 11th October 2009 at 09:07 PM.

11th October 2009, 09:25 PM	#20
gazzarose	I can't seem to find a magnet anywhere, I took the black shroud off the aerial board and its just covering the connector for the ribbon cable. I think it says A5XGC on the IC, but I can't be certain. I havn't got a magnitfying glass so I can't get close enough.

28th October 2009, 09:39 PM	#21
gazzarose	Sorry to ressurect an old thread, but I think I've made some slight progress. I turned the sat nav on a few days ago, and the 'gps is off' message had gone, and I can now view the satellite status page, but it doesn't show any satellites. I had a play, but then found that the ribbon cable thats in the black shroud on the cable had come out. So that tells me that the 'switch' to turn the aerial on and off is in the aerial itself. If i knew what wire to cut I may be able to get it working. I just don't fancy guessing at it,lol. I may have to peel the tin foil off the back of the aerial and have a look inside. Gareth

29th October 2009, 12:55 AM	#22
Sceadwian	How many wires are on that ribbon cable that goes to the Aeriel? __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."