Operation
4-2
4.3
Power-up procedure
4.3.1 Line power connections
Line voltage supply
The Model 708A Switching System can be operated from
line voltages of 100-240VAC at line frequencies of 50-60Hz.
Line power connections
Using the supplied line power cord, connect the switching
matrix to an appropriate AC power source. The female end
of the cord connects to the AC receptacle on the rear panel of
the instrument. The other end of the cord connects to a
grounded AC outlet.
WARNING
The Model 708A must be connected to a
grounded outlet to maintain continued
protection against possible shock haz-
ards. Failure to use a grounded outlet
could result in personal injury or death
due to electric shock.
CAUTION
Do not operate the instrument on a line
voltage outside the indicated range, or
instrument damage could occur.
4.3.2 Power switch
To turn on the power, push in the front panel POWER switch.
Power is on when the switch is at the inner (1) position. To
turn power off, press POWER a second time.
WARNING
The position of the POWER pushbutton
indicates the power status of the Model
708A Switching System. The status of
the crosspoint display and the other
LEDs are not indications of power being
applied to the Model 708A. Failure to
correctly recognize the power status of
the Model 708A could result in serious
injury or death due to electrical shock.
4.3.3 Power-up self-test and error conditions
During the power-up cycle, the instrument performs the fol-
lowing tests. The first five operations are transparent to the
user unless an error occurs.
1. A checksum test is performed on ROM, and a read/write
test is performed on RAM. If an error is found, the self-
test continues and the unit error LED (ERR) lights along
with crosspoint LED D6 (ROM error) or D7 (RAM er-
ror). Override either type of error with a front panel key-
press. The Model 708A will attempt normal operation.
2. The Model 708A reads identity information from the in-
stalled card and performs a checksum test on the data. If
the checksum test fails on the card, the error LED (ERR)
lights along with crosspoint LED D8. Override with a
front panel keypress. An empty slot will not produce an
error.
3. A checksum test is performed on all setups in memory.
If the instrument detects a checksum error in one or
more stored setups, the error LED (ERR) lights along
with crosspoint LED D9. The instrument clears the cros-
spoints bits of the setup(s) in error. The LEDs remain lit
until a key is pressed.
NOTE
The setup error condition may be an indi-
cation of a low battery. Cycle power off
and on. If the condition reappears, refer to
paragraph 7.5 for the battery replacement
procedure.
4. The present card configuration is compared with the
unit’s previous configuration. If there is a change, the
100 setups in memory are reformatted. The front panel
display is blanked out during this time. Crosspoint clo-
sures are not affected. The storage setup for the different
cards is changed.
5. If the unit was previously programmed as a stand-alone
or slave unit, it powers up as a stand-alone. If the unit
was previously programmed as a master, it checks for
additional units in a serial looped configuration and tries
to make them slave units. Refer to paragraph 4.6.4 for
information concerning turning on a master/slave con-
figuration. The error LED (ERR) and crosspoint LED
D3 light if there is not a closed loop (the Model 708A
can be looped back to itself). Any keypress or IEEE-488
bus operation will allow the unit to continue as a stand-
alone unit.
6. The instrument performs the display test, where it illumi-
nates all crosspoint LEDs and all other LED indicators.
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