Motorola Astro Digital Spectra Digital Spectra Plus Basic 6881076c20 E Manual

6881076C20-EFebruary 3, 2003
Disassembly/Reassembly Procedures: Replacement Procedures 8-13
17. Replace the section VOCON board shield and the top cover, and then torque the screws to 6-
8 in.-lbs.
8.2.8 Receiver Front-End Board
8.2.8.1  Low-/Mid-Power Radio
1. Remove the radio top cover.
2. Remove the two mounting screws and unplug the control head.
3. Remove the EMI metallic shielding tape (Motorola Part No.11-85984D01).
Be careful to prevent any tape particles from falling inside the chassis.
4....

February 3, 20036881076C20-E
8-14Disassembly/Reassembly Procedures: Replacement Procedures
9. Carefully remove the front-end receiver board from the radio chassis cavity and disconnect 
the coaxial cable beneath it.
NOTE:Be careful to insert the Rx injection coaxial cable straight into the receptacle on the 
VCO board, and be sure it is fully inserted.
Also, be careful to not bend the tip of the coaxial cable, which provides the contact 
for the connection. Make sure all connections are tight, and that...

6881076C20-EFebruary 3, 2003
Disassembly/Reassembly Procedures: Replacement Procedures 8-15
8.2.9.2  High-Power Radio
1. Turn the radio topside down and remove the four bottom-cover screws, and remove the 
bottom cover.
2. Remove the power amplifier and RF board shields.
3. Remove the six VCO board shield screws and remove the VCO board shield.
4. Gently pry up on the VCO board, where it extends over the RF board, until the VCO board is 
disconnected from the RF board.
5. Disconnect the two coaxial...

February 3, 20036881076C20-E
8-16Disassembly/Reassembly Procedures: Final Reassembly
8.2.10.2 High-Power Radio
1. Turn the radio topside down, remove the four bottom-cover screws, and then remove the 
bottom cover.
2. Remove the six VCO board shield screws.
3. Remove the VCO board and the RF board shields from the radio chassis.
4. Gently pry up on the VCO board, where it extends over the RF board, until the VCO board is 
disconnected from the RF board.
5. Remove the six RF board screws, and then move...

6881076C20-EFebruary 3, 2003
Disassembly/Reassembly Procedures: Final Reassembly 8-17
8.3.2 Command Board
NOTE:This assumes the PA is attached, the control head is detached, and the control head 
interconnect board is disconnected.
1. Before reassembly, apply a thin coat of thermal compound (for example, Motorola Part No. 
11-83166A01) to the bottom of the audio PA.
2. Insert the command board into the PA accessory connector (J503) before inserting it into the 
RF board connector (P500). It might be...

February 3, 20036881076C20-E
8-18Disassembly/Reassembly Procedures: Fastener Torque Chart
B. Pivot the circuit board’s display down under the retention features in the housing and 
rotate the board downward, ensuring that the board is positioned between the snap fea-
tures. Ensure that the microphone assembly’s [8] wire passes through the opening in the 
circuit board. 
C. Press downward firmly on the board until the seven snap features lock the board into 
place.
5. Install the two snap retainers [4]...

6881076C20-EFebruary 3, 2003
Disassembly/Reassembly Procedures: Fastener Torque Chart 8-19
03-10943J15 Screw, tapping M3.5X8 8-10 Controller board attachment 
(except for control head and 
remote dash board)
03-10943R55 Screw, tapping M3X8 6-8 Pivot pin (high-power)
03-10945A11 Screw, plastite M3X16 6-8 Control head and remote 
dash board attachment
03-10945A14 Screw, plastite M3X8 6-8 Remote control cable cover
03-1098A33 Screw, machine 6-8 Back housing W9 control 
head
03-12016A27 Screw, tapping,...

February 3, 20036881076C20-E
Notes
8-20Disassembly/Reassembly Procedures: Fastener Torque Chart 

Chapter 9 Basic Troubleshooting
9.1 Introduction
This section of the manual contains troubleshooting charts, error codes, a functional block diagram, 
interconnect diagrams, and flexible circuit information. This section can help you isolate a problem to 
the board level. Board-level troubleshooting does not attempt to isolate problems to the component 
level. Component-level service information can be found in the ASTRO Digital Spectra and Digital 
Spectra Plus Mobile Radios Detailed Service Manual....

February 3, 20036881076C20-E
9-2Basic Troubleshooting: Power-Up Error Codes
9.3.1 ASTRO Digital Spectra
Table 9-1.  ASTRO Digital Spectra Power-Up Error Codes
Error CodeDescriptionCorrective Action
01/02 External EEPROM checksum 
non-fatal errorReprogram the codeplug.
01/81 ROM checksum failure Reprogram the FLASH memory.
01/82 External EEPROM checksum 
failureReprogram the codeplug.
01/84 EEPROM is blank Program the EEPROM.
01/88 RAM failure - Note: not a 
checksum failureTurn the radio off, then on....