Full Charging Voltage Adjustment - Canon SPEEDLITE 540EZ Service Manual

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Part 3: Repair Information

3.2 Full charging voltage adjustment

To adjust the maximum charging voltage of the capacitors.

330 + 3V

<Tools>

* Transistor pack

Multi-meter (voltmeter)

1. Remove the rubber cap around the vertical bounce unlock button on the

flash head, and bleed the main capacitor. (For details on how to bleed the

capacitors, see page 3-1.)

2, Connect the transistor pack to the flash battery contact, and apply a voltage

of 5.8V.

3. Turn the main switch on to start charging.

4. Read the voltage of the main capacitor when charging has finished, and

adjust VR-1 so that the voltage becomes 330+3V. (Measure the same

location as when bleeding the capacitors.)

3-14

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