Large Scale Central

Help needed on Genesis front light board... ref. pics provided

General Discussion
#1

I got a new front lightboard for my Genesis, after the old one burnt out. I need help determining what wire #4 on the 4-pin plug does. The pcb traces appear to have some sort of shunt between pins 3, 4, and the headlight trace. Any assistance would be appreciated. Ultimately, the wiring will be connected to a QSI Magnum board through additional resistors in series. Thanks, JimC.

Larger view of traces.

#2

Jim -

If there is no foil inside the 3-4 hole, then I would say wire 4 is connected to nothing. There does not to appear to be any foil around the hole connecting the “shunt”.

#3

20+ years in the automotive repair business and we now deal with fiber optics but one must always reconize that wires and boards all have smoke installed in them from the manufacturer but the trick is to keep the smoke contained in the insulation or conduit.
No answers on my end Jim but I do enjoy seeing your posts on the Genesis considering my RR owns 2 and I have not really molested/violated them yet!
:wink:

#4
Jon Radder said:
Jim -

If there is no foil inside the 3-4 hole, then I would say wire 4 is connected to nothing. There does not to appear to be any foil around the hole connecting the “shunt”.


I don’t know, Jon.
It looks to me like the 4 wire might be bridged across to the trace on the right.
Ralph

#5
Ralph Berg said:
Jon Radder said:
Jim -

If there is no foil inside the 3-4 hole, then I would say wire 4 is connected to nothing. There does not to appear to be any foil around the hole connecting the “shunt”.


I don’t know, Jon.
It looks to me like the 4 wire might be bridged across to the trace on the right.
Ralph

Could be. Looks like a flux bubble to me. Would be easy to prove or disprove with a meter.

#6

I tested all six of the contacts with each other using an Ohm meter. Pin4-4 did not seem to have continuity with any other pin.

I wondered if it had something to do with the dimming and brightening of the headlights while running in reverse or during very low voltage startup.

Is it possible that the holes are alignment pins sockets for manufacture? The pins could have been conductors for testing?

Thanks for the replies.

JimC.

#7

JC, you already got the answer on the other forum. The holes are drilled to cut the traces, there is no continuity there. The traces are joined before drilling in order to test the bare boards, before components are placed.

If you look carefully at the traces cut with the holes, they allow testing board and trace continuity before the components are mounted.

The holes for the LEDs and the SMT components are drilled at the same time, so manufacturing costs are low.

Regards, Greg

#8
Greg Elmassian said:
...

The holes for the LEDs and the SMT components are drilled at the same time, …


Greg - No wonder those HP boards you worked on were so expensive … drilling holes for surface mount components? :slight_smile:

#9

Hah! that is funny!

I gotta learn to read my own posts!

How about “for the LEDs and the cutting of the traces”…

By the way, did work on some software related to the HP bed of nails tester, we were hooking up a color plotter to it… GP-IB… those testers were pretty large at the time…

Regards, Greg