13.MAIN PCB AND RF MODULE ASSEMBLY REPLACEMENT
This procedure provides instructions for replacing the main PCB and RF module assembly. Refer to Figure 7 (page 7) during this procedure.
NOTE
The test port panel is replaced as part of the main PCB assembly.
1.Place the Site Master face up on a work sur- face.
2.Remove the four corner rubber bumpers (1).
3.Remove the four screws (PN
4.While holding the two halves of the Site Master together, turn it over and set it face down on the work surface.
CAUTION
In the next step, the PCB Assy (3) and test port panel (4) must stay with the front panel.
5.Remove the bottom half (5) and fold it over to lay upside down on the work surface.
6.Disconnect the red/black cable of the battery pack from the main PCB assembly connector J6 (6).
7.Remove the screw (10) located on the bottom side of the main PCB assembly next to the RF Bridge assembly.
8.Pull the PCB assemblies clear from the top half of the case.
9.Disconnect the grey/brown cable of the LCD assembly from the main PCB assembly con- nector J8.
10.Remove the four screws holding the LCD as- sembly, but do not disconnect the
11.Use pliers to gently squeeze the nine plastic spacer heads to release them from the Key- pad PCB assembly and carefully pull the Keypad PCB with the LCD assembly from the main PCB assembly.
12.Remove the four standoffs and the EMI shield cloth.
NOTE
If the Power Monitor (Option 5) is in- stalled, remove the two screws hold- ing the Option 5 PCB assembly to the test port panel and unsolder the wires from pins 1 through 4 of the RF Detector connector on the test port panel.
13.Carefully remove the serial number from the test port panel.
14.Install the serial number on the replacement test port panel.
15.Reverse the above procedure to
10 | Site Master S820A MM |