Canon SPEEDLITE 540EZ Service Manual page 68

Part 3: Repair Information
<Tools>
¢ Transistor pack
¢ Multi-meter (voltmeter)
* Camera (EOS1-N)
¢ Lens (EF 50 mm f/1.8)
¢ Tripod
* Standard Reflector
slustnent Method>
. Apply a voltage of 1.2V to the EFID terminal in order to output the AV value
in analog.
2. Attach and draw out the fine jumber lead wire capable of measuring the AV
terminal from the flash body.
3. In order to prevent the influence of external light, set up the equipment as
shown in Figure 3-16 in a dark room of EV9 or less.
(For details on distances A and B, refer to the ratings table for details.)
4, Turn the flash main switch on, set the zoom position to 35mm, press camera
switch 1 20 seconds after the red lamp lights, and measure the voltage of the
AV terminal.
. Adjust VR3 (level) and VR6 (gain) so that the above measurement results (for
both settings A and B) fall within the ratings.
a
'Standard Reflector
Figure 3-12 Setting during FA f/stop Adjustment
3-17