Broadcast Electronics AM-2.5E, User Manual

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2-3
WARNING: DISCONNECT POWER PRIOR TO SERVICING
2-15.
RF POWER MODULE ASSEMBLY PROCEDURE.
In the event of a failure in an RF power
module, the module will be required to be disassembled. The module must be properly
re-assembled to prevent circuit board and connector mis-alignment. To re-assemble an
RF power module, proceed as follows:
1. Locate the PA 2 circuit board and install the hex standoffs in the four locations at
the rear of the circuit board.
2. Locate the PA 1 circuit board and install the front panel mounting bracket using
the four Phillips-head screws. Do not secure the screws at this time. Repeat the
procedure for the PA2 circuit board and the modulator circuit board.
3. Install the PA 1 circuit board in the PA 1 location on the RF power module front
panel. Secure the circuit board bracket to the front panel using the hex nuts.
Repeat the procedure for the PA 2 and modulator circuit boards.
4. Place the RF power module on a square and flat surface such as a table with the
top of the module facing up.
5. Place the module front panel flush with the edge of the table and align the circuit
boards as follows:
A. Move the PA 1 circuit board until the front of the circuit board is flush with the
RF module front panel and the top edge of the circuit board is straight.
B. Secure the two Phillips-head screws which mount the circuit board to the
bracket.
C. Repeat the procedure for the PA 2 and modulator circuit boards.
6. Rotate the module and repeat the alignment procedure for the bottom circuit board
bracket screws. Secure the two Phillips-head screws mounting the circuit board
to the bracket when each circuit board is properly aligned.
7. Install the hardware securing the PA 1 circuit board and the modulator circuit
board to the standoffs.
2-16.
RF POWER MODULE EXCHANGE PROGRAM.
If an RF power module is determined to
be defective, Broadcast Electronics has established an RF power module exchange
program. The program allows the customer to exchange a defective module for a
re-conditioned module. Terms of the program are available from the Broadcast Electronics
Customer Service Department. If an RF power module is determined to be defective,
troubleshoot the module or contact the Broadcast Electronics Customer Service
department for terms of the module exchange program.
2-17.
TROUBLESHOOTING PROCEDURES.
The RF power module troubleshooting procedures
are presented in Table 2-1. During the execution of the procedures, perform all
troubleshooting procedures for a symptom. The symptom may contain multiple component
failures. Once the trouble is isolated, refer to the circuit board theory of operation and
schematic diagrams to assist in problem resolution.
2-18.
COMPONENT REPLACEMENT PROCEDURE.
Component replacement procedures for
the RF power modules are presented in PART I SECTION V. Refer to COMPONENT
REPLACEMENT in SECTION V as required for the replacement procedures.