5-24 888-2408-002
WARNING: Disconnect primary power prior to servicing.
Maintenance and Alignment
5.14.2 Calibration
To finish replacing the Master Controller EEPROM U39 a complete calibration is
required. To calibrate the transmitter refer to the following procedures in this order:
• "5.12 Reflected Power Calibration" on page 5-14, then
• "5.11 Forward Power Calibration" on page 5-11
!
WARNING:
REFLECTED POWER CALIBRATION SHOULD BE COMPLETED FIRST TO PRO-
VIDE VSWR PROTECTION DURING THE FORWARD POWER CALIBRATION
PROCEDURE. THIS REQUIRES THE USE OF AN EXTERNAL WATT METER
CAPABLE OF READING 150 WATTS.
5.15 Removing/Replacing Firmware ICs
Each of the controller boards, with the exception of the Life Support Board, have 2
Firmware IC’s which contain the software for the microcontrollers. It is possible
that these may need to be replaced as part of a firmware upgrade, or they may need
to be transferred from a defective controller board to a new one. Each of these IC’s
has a printed label on top which gives:
a. The part number of the software.
b. The revision number for the software.
c. A U## component designator to locate the correct socket on the board. The
following is a list of the component designators for each of the Firmware
IC’s:
1. Master Controller - U18 and U28
2. PA Controllers - U23 and U30
3. PS Controller - U5 and U8
!
WARNING:
BE SURE TO USE AN ANTI-STATIC WRIST STRAP WHEN HANDLING PC
BOARDS OR IC’S TO PREVENT DAMAGE TO THE COMPONENTS.
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