5-16 888-2408-002
WARNING: Disconnect primary power prior to servicing.
Maintenance and Alignment
STEP 11 Shut the transmitter off and return the Reflected Power Directional
Coupler back to its normal position.
STEP 12 Press [HOME, MORE, CONFIGURATION B,D,C,D]. This takes
you to the Foldback Set screen. Set the VSWR FOLDBACK to 1.35
and press [BACK] to save the setting.
STEP 13 Turn the transmitter back on and press the RAISE button on the front
panel until you have 100% or nominal station TPO.
STEP 14 It is recommended that the following Cal Value be noted for future
reference since it may have changed from the reading in the factory
test data:
•REFLECT FACTOR from Figure 5-7 on page 5-14.
Reflected power calibration is now complete.
5.13 PC Board Replacement Procedures
!
WARNING:
BE SURE TO USE AN ANTI-STATIC WRIST STRAP WHEN HANDLING PC
BOARDS OR IC’S TO PREVENT DAMAGE TO THE COMPONENTS.
5.13.1 Replacement of the Life Support Board
If the Life Support Board is replaced, the following procedure should be performed.
STEP 1 Turn off the transmitter and remove all power at the wall breaker.
STEP 2 Remove the two screws holding the controller assembly in place and
slide it out. It will come almost all of the way out before catching
and will then drop down in the front to about a 30 degree angle.
Then remove bracket across the boards.
STEP 3 Set all jumpers on the new Life Support Board to the same locations as
the board to be replaced. There are only 3 jumpers on the Life Support
Board. JP1 and JP2 select the main and alternate exciter mute as
active HIGH or LOW. Table 2-2 on page 2-30 shows the proper
settings for a Harris exciter. JP3 should be set from pins 1-2 for a Z5.
STEP 4 Be careful to mark and note where all cables connect to the defective
Life Support Board before removing. External Interlock and Failsafe
could also be connected to this board at J4.
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