Canon SPEEDLITE 540EZ Service Manual page 11

Part 1: General Information
7. Control system
7.1 Firing modes
(1) Normal firing (pilot lamp: Lights red when flash is
ready to fire)
(2) Quick firing (pilot lamp: Lights yellow-green when
flash is ready to fire.)
This mode keeps the recycle time at or below 2 sec-
onds.
Both the built-in power source and external power
source can be used except in the following conditions.
* Quick firing inhibit conditions
1) When the camera's film transport mode is set to
continuous exposure mode.
2) TTL auto flash control mode
* When the camera is set to manual exposure mode
* When using the TTL hot shoe adapter
3) During manual firing at 1/1, 1/2
(3) Multi-firing
The multi-firing function is activated when the X con-
tact is turned ON if the flash is charged, performs
multi-firing at the set frequency (1 to 100 Hz), and
stops firing when the X contact goes OFF, at the end
of the set firing count (1 to 100 times), or when the
charge falls below threshold. When this mode is
selected, the quantity of light is set to the initial value
of 1/16 power, and can be changed by operating the
up/down button. However, it cannot be set to 1/1 or
1/2.
1) Usable frequency (31 steps)
1 ~ 20 Hzin 1 Hz steps; 25 ~ 50 Hz in 5 Hz steps;
60 to 100 Hz in 10 Hz steps.
2) Number of Flashes (31 steps)
1 ~ 20 times in 1-step increments; 25 ~ 50 times
in 5-step increments, 60 ~ 100 times in 10-step
increments
* If the number of flashes is not set, dashes appear
on the LCD panel.
Continuous firing starts when the X contact is
turned, and is stopped in the following conditions.
a. X contact OFF
b. Insufficient flash charge
c. Absolute firing limitation is reached as shown.