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Corrective Maintenance
CSA 803A Service Manual
6Ć13
Some applications of the CSA 803A may require that the power remain on.
To electrically lock the power on, use the following procedure:
ăStep 1:ăSwitch the rear panel PRINCIPAL POWER SWITCH to OFF.
ăStep 2:ăRemove the AC power cable.
ăStep 3:ăPosition the instrument on its left (handle) side, as viewed from
the front.
ăStep 4:ăRemove the bottom cover.
ăStep 5:ăLocate the A4 Regulator board.
ăStep 6:ăLocate the J820 jumper on the A4 Regulator board.
ăStep 7:ăReposition the J820 jumper from its two outer (right side) pins
to its two inner (left side) pins, without dropping the jumper.
ăStep 8:ăReplace the bottom cover. Turn the instrument in the upright
position.
ăStep 9:ăReconnect the AC power cable and switch the PRINCIPAL
POWER SWITCH to ON.
The power will now remain on regardless of the setting of the ON/
STANDBY power switch.
CAUTION
To prevent damage to the instrument and/or sampling head, do not
install or remove a sampling head while the power is on.
ăStep 10:ăTo turn the power off while the ON/STANDBY power switch is
disabled, use the rear panel PRINCIPAL POWER SWITCH.
To return to normal operation of the ON/STANDBY Power Switch, follow the
preceding steps in reverse order.
Electrical LockĆOn of
the Front Panel
ON/STANDBY Power
Switch