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Old Aug 23, 2006, 10:09 AM   #11
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imageman2004 wrote:
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To do that I can just purchase a 100 ohm resistor from ratshack?
100, 220, or 330will do (have no friend with a full junkbox?)



imageman2004 wrote:
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, even though you laughed at my multimeter.
Not at all, in fact, I am sure not much people know how to use a "Clamp on Ampmeter" :G




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Old Aug 23, 2006, 1:11 PM   #12
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what watt resistors should i get?

they sell 1 watt, 1/2 watt, 1/4 watt and 10 watt 5% wire wound resistors



or does it not really matter:?
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Old Aug 23, 2006, 2:44 PM   #13
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imageman2004 wrote:
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what watt resistors should i get?

they sell 1 watt, 1/2 watt, 1/4 watt and 10 watt 5% wire wound resistors



or does it not really matter:?
The cheappest , even 1/8 watt if they have.
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Old Aug 23, 2006, 7:49 PM   #14
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Ok, I got 100-Ohm 1/4 watt -5% tolerance resistors at ratshack. .99 cents.

was not able to short the flash to get it to fire. However I went back and set the multimeter on RX100 and discharged the flash, turned it off and shorted 4 pins on metal surface. I got a reading from the pin opposite the red circled pin in the photo while touching the circled pin to black, and the pin directly across to red test probes.

i got a reading of 7 Ohms. I also get a reading of 7 homes if i touch the black probe to the circled pin and the red probe to the top right pin the top left pin and the bottom right pin all at 7 ohms.

So Im thinking that the bottom right pin is the trigger?

Let me know what you think
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Old Aug 24, 2006, 10:56 AM   #15
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imageman2004 wrote:
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Ok, I got 100-Ohm 1/4 watt -5% tolerance resistors at ratshack. .99 cents.

was not able to short the flash to get it to fire. However I went back and set the multimeter on RX100 and discharged the flash, turned it off and shorted 4 pins on metal surface. I got a reading from the pin opposite the red circled pin in the photo while touching the circled pin to black, and the pin directly across to red test probes.

i got a reading of 7 Ohms. I also get a reading of 7 homes if i touch the black probe to the circled pin and the red probe to the top right pin the top left pin and the bottom right pin all at 7 ohms.

So Im thinking that the bottom right pin is the trigger?

Let me know what you think
In this test, you have to try to find a pair of pins which give you a low resistance (around 0 ohms) when the test button is depressed, that's the trigger pair of pin.


In last hope, you could also use the pair of wires connected to the test buttonas trigger contacts. But Istill wondering why the resistor can't let you find out the trigger pair :roll:


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Old Aug 24, 2006, 12:52 PM   #16
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Thanks ill try that
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Old Aug 26, 2006, 4:47 PM   #17
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I tried this test and got the same results, with the flash on and off where i get 7ohms from the two front pins.

This is getting frustrating, and i dont have straight line of sight to the flash test connections to see if they are similar in color to the 4 wires that are connecting the flash to the pc board in the hot shoe.

any other ideas
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Old Sep 13, 2006, 8:42 PM   #18
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Got an update, I found out what the wires on connecting the hotshoe and the gutz to the flash are so ill read from right to left as if i was looking at the hotshoe from the top of the flash thru it to the bottom where the contacts are with the two pins set in to the right.

Black = GN or guide number

Purple/Lavendar = EX

Red = SD Send?

Orange = SC Syncro

I purchased the fl40 hotshoe parts (which was no easy task) the pc board from the fl40 reads looking at the pc board with the large center pin away from me

Gnd = doesnt translate to the g40

STX = (since this lines up with the center firing pin I presume its the SD or Send?)

TXD = (fill in the blank)

RXD = (Fill in the blank)

R-TTL = EX or exposure on the G40

Im going to try to connect the new hotshoe parts with extra lengths of wires to make sure i have the connections correct then ill solder them in place permenantly.

Any thoughts or comments welcome

Ill upload photos of the parts and boards tomorrow.


(I also found a guy on ebay that sells old oly flash parts if someone wanted to purchase from him and modify the g40 contacts to fit those standard hotshoe connections)


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