888-2406-002 5-23
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:
• Reflected Power Calibration, then
• Forward Power Calibration
!
WARNING:
REFLECTED POWER CALIBRATION MUST BE COMPLETED FIRST TO PROVIDE
VSWR PROTECTION DURING THE FORWARD POWER CALIBRATION PROCE-
DURE. THIS REQUIRES THE USE OF AN EXTERNAL WATT METER CAPABLE
OF READING 60 WATTS.
5.15 Removing and 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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