Question about Metz mecablitz 45 CL-4 TTL Flash

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Metz 45 CT-1 Outup Calibration

Hi All!
Does anyone have a circuit diagram for the Metz 45 CT-1 please?
One of my units gives an output approximately 1.5 stops too low, is there an easy setup to correct this?

I have an accurate flashmeter, and a total of 7 Metz 45 series flashes.

I'm tempted to swap the photocell with another unit, but since the unit is firing consistantly low it would suggest that the photo cell is too sensitive!
Any Ideas?

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  • Austinii May 31, 2009

    Many thanks for that Kalaci, I originally trained as an electronics engineer, so no probs on terminologly.

    I had already traced the two trim pots, but neither has an effect. I don't have the circuit diagram, and can't be bothered with tracing it all out myself, however the flash works perfectly with a Mecamat attached and for the moment I'm using it like that.

    If I can find a circuit diagram then I'll go deeper into it.

    Thanks again,

    Gérard

  • Neil May 11, 2010

    I have a service manual for the Metz 45CT-1, but it's in German.I can probably find something in the circuit, if I know what I need to look for.

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I have a 45CT-1 Service Manual, but it's in German. If I knew what to look for, I could probably find what you want. I know some German, but not enough to follow the technical description in the manual.

Posted on Jul 07, 2009

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During the flash impulse the "photocell", actually a phototransistor, charges a capacitor with current, proportional to the reflected light intensity. As soon as the voltage on that capacitor reaches the trigger voltage of a four-layer diode (which, in fact, is playing a role of a PUT) that turns on and triggers the quench thyristor. There is a trimmer potentiometer in the four-layer diode circuitry, which sets the trigger voltage. You can try to fiddling with that. But the culprit of the misalignment easily can be in any of the parts in the above described circuitry.

Posted on May 22, 2009

  • Laszlo Kalmar
    Laszlo Kalmar May 22, 2009

    This is not a true fix, but may be of quick help. Cover the light sensor with one or more layers of frosted tape until the output reaches the exact value. The real fix demands some knowledge in the field of electronics. PUT, four-layer diode, photortansistor, circuit-commutated quenching of an SCR. If any of these expressions are unfamiliar to you then try to fix the internal circuitry on your own is not advised. If however you need more detailed explanation, drop me a mail.

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  • 7 Answers

I think that they all slightly under expose, and would'nt muck about with the internals. Have you removed the flash diffuser that is clipped on the front?

Posted on Feb 11, 2010

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