NEC Mcu 5000a Multipoint Control Unit Equipment Manual
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NECA 340-414-500 Revision 2.0 Page 1 of 2 MCU 5000A Multipoint Control Unit TCP-022 TROUBLESHOOTING OF VDSW UNIT GENERAL: Sectionalization of failure is performed by the LED indication of VDSW unit. APPARATUS: None STEP PROCEDURE REFERENCE NO. Note 1: Location of SWs, Straps, LEDs, and list of LED function are shown in GSD-010 . Note 2: These do not indicate failure conditions directly but may be an aid to failure sectionalization. Note 3: When a failure has happened to the visual communication, perform the troubleshooting checking LEDs of this unit. 1 Verify that the PN ERR of VDSW unit is lit. If YES , go to Step 2 . If NO , go to Step 3 . 2 When the PN ERR of this unit is lit. It lights up when the judgment of abnormality is given as a result of loopback pattern comparison at the time of MCU loop test. Then, go to Step 12 .TCP-004 3 Check the lighting condition of LEDs on the VDSW unit. 4 Does CONF A LED light when group A communication is performed? (Does CONF B LED light when group B communication is performed?) If YES , go to Step 6 . If NO , go to Step 5 . 5 Turn the toggle switch to CONF A =Conference A (CONF B = conference B), and then verify the state of LED. If it is lit, go to Step 7 . If not, go to Step 6 . 6 Check the power-up and setup of VL 5000s in the participating conference rooms.
Page 2 of 2 NECA 340-414-500 Revision 2.0 TCP-022 MCU 5000A Multipoint Control Unit TROUBLESHOOTING OF VDSW UNIT STEP PROCEDURE REFERENCE NO. 7 Are broadcast sending station LEDs (VIDEO RC1 to 4) lit? If YES , go to Step 11 . If NO , go to Step 8 . 8 Request the system operator to send the voice signal from the conference room (send his own voice). 9 Are broadcast sending station LEDs (VIDEO RC1 to 4) lit? If YES , go to Step 11 . If NO , go to Step 12 . 10 This unit operates normally. Then, go to Step 12 . 11 The VDSW unit is faulty. Replace it. 12 End of procedure.