Anritsu Site Master S251A, Maintenance Manual

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NOTE
Carefully use pliers to pull the rub-
ber tabs tight to ensure that the
membrane is flush with the PCB.
14. LCD REPLACEMENT
This procedure provides instructions for replacing
the Liquid Crystal Display (LCD). Refer to Figure 9
during the procedure.
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 900-811) (2).
4. While holding the two halves of the Site Mas-
ter together, turn it over and set it face down
on the work surface.
CAUTION
In the next step, the PCB assembly
(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 battery connector from 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. Remove the grey/brown cable from the con-
nector J8.
10. Remove the four screws from the LCD PCB
assembly.
11. Carefully remove the 20-way ribbon cable
from the connector on the keypad PCB as-
sembly.
12. Install the new LCD PCB Assembly.
15. MAIN RF PCB ASSEMBLY
REPLACEMENT
This procedure provides instructions for replacing
the main RF PCB. Refer to Figure 9 during this pro-
cedure.
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 900-811) (2).
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 assembly
(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 battery connector from 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. Remove the four screws holding the LCD as-
sembly, but do NOT disconnect the 20-way
connector from the keypad PCB assembly.
10. While using pliers to gently squeeze the nine
plastic spacer heads to release them from the
Keypad PCB assembly, carefully pull the
keypad PCB with the LCD from the main RF
PCB assembly.
11. Remove the four standoffs and the EMI
Shield cloth.
12. Remove the three screws holding the main
RF PCB assembly to the test port panel.
Site Master MM 11