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-009 TROUBLESHOOTING OF EC H221 MUX UNIT GENERAL: Sectionalization of failure is conducted by the front lamp (LED) indication of EC H221 MUX unit. APPARATUS: None STEP PROCEDURE REFERENCE NO. Note: Location of SWs, Straps, LEDs, and list of LED function are shown in GSD-004 . 1 Is FUN ER (RC10) or MEM ER (RC 9)LED lit? If YES , the EC H221 MUX unit is faulty. Replace it. If NO , go to Step 2 .TCP-017 2 Is REC (RC16) LED or REM ALM (RC15) LED lit? If YES , go to Step 3 . If NO , the EC H221 MUX unit is normal. 3 Verify that the power of VL5000 is in on. If YES , go to Step 4 . If NO , turn on the power. Then, go to Step 4 . 4 Verify that parameter setting of VL5000 is correct. If YES , go to Step 5 . If NO , set the correct parameters. Then, go to Step 5 . 5 Set the MUX strap terminal of this unit to OFF . 6 Set the MLB strap terminal of this unit to ON . (Loopback is set on the EC H 221 MUX unit) Note: Performing Steps 5 and 6 , it becomes possible to loopback video and audio signals and Low Speed Data to the line side without substituting the H 221 synchronizing signal. 7 Verify that low speed data, video, and audio signals of its local station can be received at each conference room by requesting the remote loop using the RLCS command (refer to NECA 340-414-300 ). If YES , go to Step 8 . If NO , the EC H221 MUX unit is faulty. Replace it.TCP-002 COP-177 TCP-017
Page 2 of 2 NECA 340-414-500 Revision 2.0 TCP-009 MCU 5000A Multipoint Control Unit TROUBLESHOOTING OF EC H221 MUX UNIT STEP PROCEDURE REFERENCE NO. 8 Set the MUX strap terminal of this unit to ON. Note: By doing this, it becomes possible that the H221 synchronizing signal is substituted and Low Speed Data, video and audio signals are looped back to the line side. 9 Verify that low speed data, video, and audio signals of local station can be received at each conference room by requesting the remote loop using the RLCS command. If YES, perform the troubleshooting of the V SW/LSD IF unit. If NO, the EC H221 MUX unit is faulty. Replace it.TCP-002 COP-146 TCP-010 TCP-017 10 Verify that switch and strap settings of this unit are correct. If YES, go to Step 11. If NO, set the correct position. Then, go to Step 5. 11 End of procedure.
NECA 340-4 14- 50 0 Revisio n 2.0 Page 1 o f 2 MCU 5000A Multipoint Control U nit TCP-010 TR OUBLESHO OTING OF PG/SIO UNIT
Page 2 of 2 NECA 340-414-500 Revision 2.0 TCP-010 MCU 5000A Multipoint Control Unit This page is for your notes.
NECA 340-414-500 Revision 2.0 Page 1 of 2 MCU 5000A Multipoint Control Unit TCP-011 TROUBLESHOOTING OF V SW/LSD IF UNIT GENERAL: Sectionalization of failure is performed by the LED indication of V SW/ LSD IF unit. APPARATUS: None STEP PROCEDURE REFERENCE NO. Note 1: Location of SWs, Straps, LEDs, and list of LED function are shown in GSD-005 . 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 ARM LED of V SW/LSD IF unit is lit. If YES , go to Step 2 . If NO , go to Step 3 . 2 When the ARM LED 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 V SW/LSD IF 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-011 MCU 5000A Multipoint Control Unit TROUBLESHOOTING OF V SW/LSD IF UNIT STEP PROCEDURE REFERENCE NO. 7 Are broadcast sending station LEDs (TX1 to 8) 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 (TX 1to 8) 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 V SW/LSD IF unit is faulty. Replace it.TCP-017 12 End of procedure.
NECA 340-414-500 Revision 2.0 Page 1 of 2 MCU 5000A Multipoint Control Unit TCP-012 TROUBLESHOOTING OF A CODEC UNIT GENERAL: Sectionalization of failure is performed by the LED indication of A CODEC unit. APPARATUS: None STEP PROCEDURE REFERENCE NO. Note: 1: Location of SWs, Straps, LEDs, and list of LED function are shown in GSD-006 . 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 audio system, perform the troubleshooting checking LEDs of this unit. 1 Start up the system and request each conference room to talk into the microphone more loudly than usual. 2 Are LEDs (RC 1 to 4) of the A CODEC unit corresponding to the conference rooms lit? If YES , go to Step 3 . If No , go to Step 4 . 3 Perform the troubleshooting of the A SUM unit. Then, go to Step 5 .TCP-013 4 The A CODEC unit is faulty. Replace it.TCP-017 5 End of procedure.
Page 2 of 2 NECA 340-414-500 Revision 2.0 TCP-012 MCU 5000A Multipoint Control Unit This page is for your notes.
NECA 340-414-500 Revision 2.0 Page 1 of 2 MCU 5000A Multipoint Control Unit TCP-013 TROUBLESHOOTING OF A SUM UNIT GENERAL: Sectionalization of failure is performed on the A SUM unit. APPARATUS: Level Meter or Speaker with amplifier Figure 1: Monitoring of Audio Signal STEP PROCEDURE REFERENCE NO. Note 1: Location of SWs, Straps, LEDs, and list of LED function are shown in GSD-007 . Note 2: These do not indicate failure conditions directly but may be an aid to failure sectionalization. Note 3: This troubleshooting is performed when a failure has happened to the audio system. Request each conference room to talk into the microphone and start the procedure after checking to see that the LEDs of the A CODEC unit corresponding to the conference rooms are lit. 1 Connect a level meter or speaker with amplifier to the monitor terminal on the unit (see Fig. 1). 2 Monitor with level meter or speaker with amplifier, and verify that the signal is monitored. If YES , go to Step 3 . If NO , go to Step 4 . 3 The A CODEC unit is faulty. Replace it. Then, go to Step 5 . 4 The A SUM unit is faulty. Replace it. 5 Disconnect the level meter or speaker with amplifier from the monitor terminal. 6 End of procedure. SPEAKER OR MON A SUM UNIT 600 ohm BALANCE LEVEL METER
Page 2 of 2 NECA 340-414-500 Revision 2.0 TCP-013 MCU 5000A Multipoint Control Unit This page is for your notes.