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D Flash 40 - troubleshooting

A

Akira2000

New Member
Hello everybody,

I have problems with my D-Flash 40. I usualy use it radio trigged, far from the (canon)camera. For several days it won't work reliable..

It often misfires radio trigged - even when I push the test-button, the flash doesn't fires every time. The battery are fully charged and the trigger syncs well. The electronics inside seems not to be damaged.

Does anybody has tipps for troubleshooting?

Akira2000
PS: I beg to excuse my bad english :)
 
That is an often found problem with the D40:
The oscillator gives full power to the capacitors ready to unload through the flash tube but it can not be triggered.

The electronic circuit is built around a custom built integrated circuit.
I have not been able to get spares for that circuit.
Hasselblad will probably exchange the complete print to get the D40 going.
Be prepared for a large bill.


Paul
 
Hello Paul, thanx for your comment! Do you think it is possible to build a workaround the electronic circuit? Or du you think there are parts of the circuit damaged? Greets
 
I had a good friend take alook at the circuit to see what is possible.
He did not come up with a suggestion to trigger the flash with a modified circuit.
It seems only a replacement of the IC used will solve this problem.
If you come up with a different solution please let me know.

Paul
 
hi all,

there are two ways to fix the problem!
First, and easy way: Try "lowpower" recharg.batterys. I had problems with AA2700mAh - better are <2200mAh

Second, and long way: The trouble shooting guide from hasselblad says, you can short-circuited two pins (pin 8 and 6 on CN3), then the flash should work. But this is just a workaround - to fix the complete problem, you shout replace platine PCB1055.

The first way was mine... :)
 
manual power control

as far as i know the d-flash is a normal ttl thyristor flash. these flashes usualy work like this: the flash is getting two signals - first the "fire" and after a little time the "quench". the duration of the time between this two signals is responsible for the power the flash is sending out. longer time between the signals means more power and vice versus.
since a couple of month i am working with radiopopper JrX studio triggers. these triggers are using this ttl adjustment for a manual power setting. teh triggers a simulating a ttl system and send this two signals to the conected flash.
the only problem is now to find out the wires at the flash wich are for ground, fire and quench. i cutted of the ttl plug of the d-flash and got 6 wires: blank, yellow, red, white, blue and green. blank is ground, yellow is fire, red is the contol lamp (flash is ready) and now i got a problem. i tried white, blue and green but none of these wires seems to be the right one. i was not able to bring the quench signal from the radiopopper JrX receiver to the d-flash. i got now prolems to do so with a metz 60ct1, nikon Sb flashes are no problems either, but the d-flash ........
can anybody help?
 
That is an unusual question which needs detailed knowledge of the D 40 circuitry to answer.

I have several D40 torches and know these are not exactly service friendly.

A good look at the service manual of the D40 may give the answer.


Vic.
 
@victorh:
if i would have the service manual or a circuit plan it would be a great help. if some has one of these and could send it to me i would be very thankfull:
tim@brakemeier.info
if i manage to find out how to connect the JrX i´ll post it here.
 
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