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CAUTION
POSSIBLE
EQUIPMENT
DAMAGE
86
RSPSupply - 1-888-532-2706 - www.RSPSupply.com
http://www.RSPSupply.com/p-8457-MDS-UP-9790X.aspx
RJ-11 PLUG
(TO RADIO)
4
5
1
6
6
RJ-11 PIN LAYOUT
Figure 38. RJ-11 to DB-9 Adapter Cable
8.0 REPLACING ASSEMBLIES
GE MDS does not recommend component-level repair of a transceiver
board in the field due to the complex nature of the circuitry and the use
of surface-mount technology throughout the radio. You should return
malfunctioning assemblies to the factory (or authorized service center)
for repair or replacement.
One approach to field-level servicing is to have spare modules available
for the four easily replaced assemblies—the Main Transceiver Board,
Power Supply, Front Panel, and Internal Duplexer. In this way, you can
quickly remove and replace a defective assembly with a working
assembly. The following instructions describe the removal and installa-
tion of these assemblies.
Disconnect primary power to the radio before removing or installing
transceiver board or power supply assemblies.
8.1 Transceiver Board and Power Supply
Assemblies
To remove either of these assemblies, loosen the two captive thumb-
screws at each side of the module, then slide the module straight out as
shown in
Figure 39 on Page
modules are fitted with in-line connectors.
To replace the AC Power Supply Module's fuse, use 5x20mm Glass
3.15A 250V fuse (GE MDS P/N 29-2130A06).
To re-install these modules, make sure that the slides are properly
aligned with the guide slots on the chassis, then push straight in. Tighten
the thumbscrews to secure the assembly.
MDS 4790/9790 Series I/O Guide
Invisible place holder
TXD
RXD
GND
87. There are no cables to disconnect, as the
MDS 05-3438A01, Rev. F
DB-9 FEMALE
(TO COMPUTER)
RXD
2
TXD
3
GND
5
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