Lorenz Pulse 5 - blown transistor

[AlexP]

Hi Mrand. Is transistor T3 the one which I circled in red in this photo: http://prikachi.com/images/85/4779085O.jpg

Do you know what the other transistor (the one that is back to back with the large capacitor) is and what its role is? It is labeled "B" on the PCB.

[Mrand]

Yes, this is transistor T3. The second element (B) which is close this is the stabilizer -8V ( 7908 ).
Mrand

[Rumcajs]

I checked the diodes that Mrand mentioned and they were OK. so I only replaced the big transistor. The detector now seems to be working like it worked before the damage. It detects metal just fine. The big transistor gets hot very slightly. The only problem I have with it now is that it doesn't switch off when I put the mode switch in the OFF position and the only way to turn it off is to disconnect the coil - similar to the Lorenz LPX2 MD. Any ideas? I don't think it is the mode switch as it doesn't turn off even if I disconnect the multiwire flat cable from the front panel to the upper PCB.

Hi AlexP,

you wrote, what switching off the detector, when unplugged the head cable?

My first idea is an little micro switcher (similar than printer paper sensor) in the house and around the socket. This switcher is enabled with a little pin. This pin is mounted to plug and must be an little hole in the house. This micro switch is disconnecting the supply when removing the cable plug.

The my second idea is similar: use an reed-relay tube only (without coil) and a little neodinyum magnet. These parts are similar mounted, without drilling (the magnet is mounted the plug, and reed is mounted in the socket in the your plastic house).

Other: I m an outsider in the Lorenz, but an little heatshink in the IRF ,,transistor''
is always good choice.

Good hunting


Rumcajs

[Rumcajs]

Hi all,

anybody known an cable connection with mounted switch, and this connection is good for an PI-detector?

Many thx


Rumcajs

[Mrand]

What for such combinations? There will be enough to change T3. I know this detector very well.
Mrand

[Rumcajs]

What for such combinations? There will be enough to change T3. I know this detector very well.
Mrand

ok. Reparing an hair dyer and starting this dryer than helicopter...

[AlexP]

Hi Mrand, I replaced the T3 transistor and the detecrtor is in full working order now. Thanks a lot for your help. You obviously know this detector very well.

Rumcajs: All Lorenz detectors are designed to work only if they have a coil connected to them. As soon as you disconnect the coil, the detector turns off. This is done in the coil connector - two of the pins in the coil connector are wired together - see pic below.

http://prikachi.com/images/991/4779991g.jpg

This is for a small mono coil. The connector wiring is different for 1m x 1m mono coil and for 35cm DD coil, but in all cases, pins 5 and 6 are always connecetd and this is what closes the circuit when you plug in the coil connector into the unit.

[kt315]

Alex,

I again ask you give the photos PCB both sides. People needs in the schematic of LORENZ-5.

wish you success

[AlexP]

No problem. Here are more photos:

http://prikachi.com/images/935/4806935T.jpg
http://prikachi.com/images/940/4806940t.jpg
http://prikachi.com/images/942/4806942l.jpg
http://prikachi.com/images/943/4806943G.jpg
http://prikachi.com/images/953/4806953S.jpg
http://prikachi.com/images/949/4806949n.jpg

[kt315]

thanks lots!

[Morris_jo]

Hi Mrand, I replaced the T3 transistor and the detecrtor is in full working order now. Thanks a lot for your help. You obviously know this detector very well.

Rumcajs: All Lorenz detectors are designed to work only if they have a coil connected to them. As soon as you disconnect the coil, the detector turns off. This is done in the coil connector - two of the pins in the coil connector are wired together - see pic below.

http://prikachi.com/images/991/4779991g.jpg

This is for a small mono coil. The connector wiring is different for 1m x 1m mono coil and for 35cm DD coil, but in all cases, pins 5 and 6 are always connecetd and this is what closes the circuit when you plug in the coil connector into the unit.

Dear Sir ,

Would you please explain how to connect the wiring for 1m*1m coil ?


I am having a problem with my 1m*1m coil connecter ... as you can see below :








Thanks in advance .

[Mrand]

BINDER connector for all Lorenz detectors frame coil:
Pin1 - connected witch MASSE wire
Pin2 - Not Connected
Pin3 connected with Pin4 and Pin7 and connected witch HOT wire
Pin5 connected witch Pin 6
This is all

[eclipse]

AlexP how did you remove the black resin covering the PCB and made it so clean, pcb looks like it hasn't been covered with it?

[AlexP]

The detector has two PCBs. The outer PCB (which I have pictured) is not covered with resin.

[eclipse]

I see, thanks.