RAD Data comm RSD-20 Operational Field Strapping Changes, Fault Isolation Procedure, Power Supply

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OPERATION

RSD-20 OPERATOR'S MANUAL

3.4OPERATIONAL FIELD STRAPPING CHANGES

Access inside the equipment is only permitted to authorized service personnel.

If it becomes necessary to reconfigure the RSD-20 for a different type of operation, the internal straps must be changed to correspond to the new operating mode. For guidance in repositioning the straps, refer to the information given in Chapter 2 of this manual. It is recommended that the straps be changed by an experienced technician.

CAUTION Do not open the top cover for strap changes before removing the AC power from the unit.

3.5FAULT ISOLATION PROCEDURE

WARNING These service instructions should be used by qualified personnel only.

Access inside the equipment is only permitted to authorized service personnel.

3.5.1 Power Supply

If AC power has been applied to the RSD-20 but the green power LED does not light up, check installation according to the following procedure:

a)Verify that the 110/220 selector is set correctly.

b)Verify that the power switch light is on.

c)Unplug the AC cord and then pull out the fuse (located above 3-pin power connector). Check the fuse and replace if necessary (0.4A S.B.).

d)Remove the top cover of the unit and check that the 5-pin power connector (connecting the secondary wires of the transformer to the main card) is connected properly.

3.5.2 RSD Malfunction

If the Power LED is ON but the RSD-20 is not functioning in the system, proceed as follows:

a)Unplug the AC cord and remove the top cover.

b)Verify that all the DCE/DTE switches are set according to the data system requirements.*

c)Verify that the strap settings are correct.

d)Check the three large LSI chips (RJ-006) and if necessary reposition in the socket.

*In the V.35 option, check that main and sub-channel’s three switches are set to the same position.

3.3

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Contents RSD-20 DUUDQW\ 6DIHW\DUQLQJV HFODUDWLRQRI&RQIRUPLW\ Table of Contents Functional Description IntroductionGeneral Specifications Indicators PowerOrdering PhysicalInstallation Physical InstallationElectrical Installation AC PowerRear Panel Internal Switches and Strap SelectionRear Panel Installation Installation System Synchronization and Clock Distribution RSD-20/V.35Synchronization on Main Channel Modem Clock Synchronization on Main Channel Modem’s ClockSynchronization on RSD-20 Internal Clock Synchronization on Internal ClockRSD-20 Synchronization on Sub-channelRSD-20/X.21 External Clock for more than one Sub-channelMain channel is DTE attached to a modem Main and all sub-channels are DCE attached to DTEs Main channel is DCE and sub-channels are mixed DTE and DCE Front Panel Controls and IndicatorsOperation Operating Procedure Power Turn OnPower Turn Off OperationFault Isolation Procedure Power SupplyOperational Field Strapping Changes RSD MalfunctionContention SUB-CHANNEL DisableTheory of Operation and Applications IntroductionControl Signals Main Channel Control SignalsSub-channel Control Signals RSD-20/V.35RSD-20/X.21 Theory of Operation and Applications RSD-20 Operators Manual Theory of Operation and Applications Applications RSD-20 Operating ModesTable A.1 X21 Interface Signal Description Appendix aTable B.1 Interface Signal Description Appendix B
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