Vocon (Vocoder/Controller) Board; Command Board; Low-/Mid-Power Radios - Motorola ASTRO SPECTRA Service Manual

Disassembly/Reassembly Procedures: Replacement Procedures
7. Tighten the mounting screws (torque 8-10 in.-lbs.).
8. 20- and 35-watt radios only: Press the PA compartment shield, and install the PA cover.
8.2.6

VOCON (Vocoder/Controller) Board

NOTE: If you want to keep the information currently stored in the radio code plug, save its contents
with the appropriate application software before you remove the original VOCON board. Refer
to the Radio Service Software (RSS) user's manual, or the Customer Programming Software
online help.
1. Use a Torx T15 driver to remove the top cover by removing the four screws.
2. Remove the VOCON board shield.
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C a u t i o n
3. Remove the board from the command board after reading the NOTES and CAUTIONS in this
section.
4. Place the new board into the radio by aligning the pins and pressing the board firmly into
place, and then replace the board shield.
5. Replace the radio top cover, and use four new screws (torque to 10-12 in.-lbs.) to secure the
top cover. Ensure the screws are aligned with the holes.
NOTE: Replacement VOCON boards are preprogrammed to enable the radio to function
!
C a u t i o n
6. Program the VOCON board as indicated in
are found in
8.2.7

Command Board

8.2.7.1 Low-/Mid-Power Radios

1. Remove the radio top cover.
2. Remove the PA assembly.
3. Remove the VOCON board according to previous instructions. See CAUTION notes in
VOCON board replacement section.
4. Disconnect the PA connector and the control head connector.
5. Remove the heatsink clip from the power transistor on the command board.
6. Use a Torx T15 driver to remove six mounting screws.
6881076C20-E
To remove the VOCON board, gently pry the board up at the center
of the connector end of the board. This will help prevent damage or
bending of the connector pins.
only at test mode level. To restore the radio to complete operation, you must
program the VOCON board via the radio service software or the Customer
Programming Software.
Once installed, a replacement VOCON board may not be initialized
a second time. Use the radio test modes to ensure that replacing the
VOCON board will solve the problem before you initialize it.
Chapter 6: Radio Alignment Procedure
Table 8-1 on page 8-1 . Programming procedures
of this manual.
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February 3, 2003