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

6881076C20-EFebruary 3, 2003
Disassembly/Reassembly Procedures: Replacement Procedures 8-3
11. Remove the circuit board assembly from the housing.
12. Remove the keypad [6] from the housing assembly [7].
8.2.2.2  Models W4, W5, and W7
NOTE:For the following procedure, refer to Chapter 11: Exploded Views and Parts Lists, beginning 
on 
page 11-3, for the exploded view and associated parts list applicable to the model being 
disassembled.
1. Unplug the microphone.
2. Remove the two front panel screws using...

February 3, 20036881076C20-E
8-4Disassembly/Reassembly Procedures: Replacement Procedures
7. Carefully separate the printed circuit board, internal spacer, and elastomer keypad assembly 
from the front panel.
On rotary control head models, care must be taken not to damage the flex circuit when 
separating the printed circuit board from the front housing. Do not disturb the buttons in the 
front panel.
On rotary control head models, the flex circuit must also be unplugged.
8. On rotary control head...

6881076C20-EFebruary 3, 2003
Disassembly/Reassembly Procedures: Replacement Procedures 8-5
3. Using a Torx T10 driver, remove the five 8mm tapping screws [17] from the Display Board Kit 
[37], the two 10mm captive screws [12] with the leaf assembly spring [11], and the two 16mm 
tapping screws [38] from the control PC board.
4. Remove the Command Board Kit [36] from the back housing and the Display Board Kit [37] 
from the front housing.
5. Remove the elastomer keypad [7], ON/OFF switch gasket [34], the...

February 3, 20036881076C20-E
8-6Disassembly/Reassembly Procedures: Replacement Procedures
8.2.4 Remote Interconnect Board
8.2.4.1  Low-/Mid-Power Radios
1. Remove the two front panel screws using a 2.5mm hex key driver.
2. Grasp the front panel firmly, and carefully unplug it from the radio.
3. Remove the three screws that hold the remote interconnect board to the front panel using a 
Torx T10 driver.
4. Install the new remote interconnect board onto the front panel, and replace the screws. 
Torque the...

6881076C20-EFebruary 3, 2003
Disassembly/Reassembly Procedures: Replacement Procedures 8-7
13. Fold the ribbon cable down flat. Replace the top cover and torque the two screws to 6-8 in.-
lbs. These screws are self-tapping and caution should be used so that the screws enter the 
previously cut threads.
8.2.5 Power Amplifier Board
8.2.5.1  Low-/Mid-Power Radios
1. Use a Torx T15 driver to remove the four screws from the PA cover, and then remove the 
cover and the PA shield.
2. Use a metric 3.0mm Allen...

February 3, 20036881076C20-E
8-8Disassembly/Reassembly Procedures: Replacement Procedures
NOTE:Before disconnecting, note which RF cable goes to the VCO (TX injection) and 
which goes to the RX front end. This will facilitate assembly.
12. Apply a thin white coat of thermal compound (for example, Motorola part no. 11-83166A01) in 
the power transistor mounting locations of the chassis where the thermal compound was 
removed.
13. Locate the new PA board into the chassis cavity by feeding the short coaxial...

6881076C20-EFebruary 3, 2003
Disassembly/Reassembly Procedures: Replacement Procedures 8-9
6. Use a Torx T15 driver to remove the larger screws. (Five screws are used on 15-watt, six on 
the 20- and 35-watt.)
7. Carefully lift the PC board from the heatsink.
NOTE:Before unsoldering the RF cables, note which cable is attached to each connector 
on the board. This will facilitate assembly since the cables differ in length.
8. Unsolder the antenna coax cable attached to the bottom of the board.
9. Unsolder...

February 3, 20036881076C20-E
8-10Disassembly/Reassembly Procedures: Replacement Procedures
Figure 8-4.  PA Board Screw Fastening Sequence (800 MHz 20- and 35-Watt PA)
7. Place the power module shield over the power module.
8. Install the power module and shield with two compression washers and screws (torque 6-8 
in.-lbs.).
9. 20- and 35-watt radios only (
Figure 8-5): Solder the final device leads and five caps. Caps 
must be soldered flat to the board, and each cap surrounding the final device must be...

6881076C20-EFebruary 3, 2003
Disassembly/Reassembly Procedures: Replacement Procedures 8-11
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)...

February 3, 20036881076C20-E
8-12Disassembly/Reassembly Procedures: Replacement Procedures
7. Carefully lift the command board from the housing, making sure that the floating header is 
with the RF board.
8. To reassemble the command board, apply a thin coat of thermal compound (for example, 
Motorola part no. 11-83166A01) to the audio amplifier mounting surface.
NOTE:Do not use a thick coating of compound as it could degrade the thermal efficiency 
of the heatsink.
Prior to installing the command board,...