Midland Radio SP-300 - Manual (Page 20)

Page -17-
May 2001
MAXON
SP-300 HAND HELD
REMOVING & REPLACING THE MAIN
BOARD
To remove the Main Board:
1. Remove the Battery (Refer to Removing & Replac-
ing the Battery).
2. Remove the PTT Assembly (Refer to Removing &
Replacing the PTT Assembly).
3. Remove the Dust Cap (Refer to Removing &
Replacing the Dust Cap).
4. Remove the Antenna & Control Knobs (Refer to
Removing & Replacing the Antenna & Control
Knobs).
5. Remove the Back Cover (Refer to Removing &
Replacing the Back Cover).
6. Insert a small straight (Flat Head) screwdriver blade
between the Main Board and the radio chassis.
7. Gently pull backward with the screwdriver until the
Main Board has been unsnapped from the lower sec-
tion of the chassis.
8. It may be necessary to pull the Main Board up a little
more to gain easier handling for removal.
z CAUTION: If performing step 8, insure that the
screwdriver is placed on the metal frame of the Main
Board and not directly on the Main Board PCB.
Damage to the Main Board and Microprocessor
could occur.
9. Grip the Main Board near the indicated arrows as
shown in Figure 9B.
10. Gently work the Main Board in an up & down
motion and pull in the direction indicated by the
arrow in Figure 9B.
z CAUTION: Do not use excess force when removing
the Main Board from the chassis. Damage to the
speaker connection could occur.
z Note: It is not necessary to remove the stud mount
antenna jack from the radio.
11. Remove the Speaker wire connector from the Main
Board connector.
8
6
7
Figure 9-Main Board Removal & Installation
Figure 9A-Main Board Removal & Installation
10
9
Figure 9B-Main Board Removal & Installation