User's Manual

Table Of Contents

EX7100 Technical Manual - Module Descriptions

7.3.4 VHF Transmitter Module Replacement Procedure

1. Remove the bottom cover as described in Section 6.1.

2. Note the connector positions and the way that the cables are run (it is important that

all cables are replaced as they were initially run before the module replacement

procedure)

Remove the following connectors from the Transmitter PCB

PL101, PL103, PL104, PL105 and PL108.

Remove connector PL101 from the Receiver PCB

(This connector is attached to W102 on the Transmitter PCB)

3. Remove the six M3 screws and washers that retain the module. Keep the screws in a

safe place.

4. Carefully position the new Transmitter PCB into the casting taking care not to flex the

PCB as this can cause damage to the surface mounted components. Replace the six

M3 PCB mounting screws and washers. Tighten the screws carefully.

5. Reconnect connectors PL101, PL103, PL104, PL105 and PL108 on the Transmitter

PCB and PL101 on the Receiver PCB; ensure that all cables are run as they were

prior to removal.

6. Inspect the EX7100 terminal to ensure that it is free of foreign material. Remove and

clean as required.

7. Connect the antenna to the terminal. (Caution:

do not proceed until this is done to

avoid damage to the PA module). Apply power to the EX7100 rear panel and switch

the terminal on.

8. If necessary, retune the Transmitter output filter (refer to Section 7.3.3 above).

9. Set the Transmitter, Receiver and RF Power Amplifier module configuration variables

as these are all carried by the microcontroller on the Transmitter module (refer to

Section 3 as required).

10. Return to normal operating mode and check that the link is correctly established. If

not refer to Section 7.3.2 above and Section 5 “Troubleshooting” as required.

11. Replace the bottom cover, taking care to tighten every screw. No screws should be

left over at the end of the job

12. Re-install the EX7100 back into its rack and re-connect all necessary power,

signalling and antenna cabling.