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WARNING: Disconnect and lockout AC primary power prior to servicing
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STEP 7: Check air switch operation by momentarily shutting off CB2.
STEP 8: Check door interlock operation by opening the rear door while cabinet is
running. When the door is opened while the power supplies are on, the door must remain
open for 10 seconds to allow the 50 volt capacitor bank to totally discharge and allow the
SCR to reset. It should shut down and restart a few seconds after door is closed. Check for
door interlock indication at control cabinet while door is open.
STEP 9: Check the 50 volt supplies. Measure the voltage at pin 3 or 4 of a module
connector from the front of the cabinet. (PS-1 powers the right column, and PS-2 the left.)
STEP 10: Turn off the PA cabinet and replace P2 on the slave controller.
2.15.3 Module Installation
!
WARNING:
DO NOT USE EXCESSIVE FORCE OR SLAM MODULES INTO THE SLOTS.
The modules may now be installed. Refer to factory test data for placement of modules
by serial number and slot number. Low band PA cabinets have Driver and Power Amplifier
Modules. High Band PA Cabinets have three types of modules, Drivers, PA Drivers and
PAs. The drivers are keyed and will not fit into a PA slot. Although each type is
interchangeable and will work in any like socket, when starting out it is best to reassemble
them in the same locations as tested. Keep a record of any changes for future reference.
Make sure each module is completely seated.
2.15.4 Control System Check Out
STEP 1:
Apply power to all cabinets and peripherals.
STEP 2:
Turn on all cabinet breakers.
STEP 3:
Check the CABINET SELECT LED on each slave controller. For systems with
single PA cabinets, this LED should illuminate continuously. For multiple-cabinet systems,
the LED's should be flashing.
STEP4: Momentarily switch off each PA cabinet logic breaker CB1 and look for
a CONTROL FAULT on the control cabinet while the breaker is off. Depress and hold
power LOWER controls for 15 seconds each to ensure that exciters are turned all the way
down.
STEP 5: Press transmitter ON push-button.
STEP 6: Check air system for proper operation. There should be slight negative air pressure
above transmitter, and positive pressure inside the cabinets of approximately 0.7 inches of
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