NEC Mcu 5000a Multipoint Control Unit Equipment Manual

NECA 340-414-500 Revision 2.0 Page 1 of 2
MCU 5000A Multipoint Control Unit TCP-014
  TROUBLESHOOTING OF VIDEO RELATED FAILURE
GENERAL: 
When the video signal is not output, troubleshooting is performed through 
the use of line from each conference room.
APPARATUS: 
None
STEP PROCEDURE REFERENCE NO.
1 Is the CONF A LED (CONF B LED) of the V SW/LSD IF unit lit?
If YES
, go to Step 3
.
If NO
, go to Step 2
.GSD-005
2 Turn the toggle switch on the V SW/LSD IF unit to CONF A (CONF B). 
Then, verify that CONF...

Page 2 of 2 NECA 340-414-500 Revision 2.0
TCP-014 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-015
  TROUBLESHOOTING OF AUDIO SYSTEM
GENERAL: 
Troubleshooting of the audio system is performed through the use of line 
from each conference room.
APPARATUS: 
Level Meter or Speaker with amplifier
STEP PROCEDURE REFERENCE NO.
1 Start up the whole system.
2 Request each conference room to speak loudly  for a test.
3 Are the appropriate LEDs (RC 1 to 4) of the A CODEC unit lit?
If YES
, go to Step 4
.
If NO
, replace the A...

Page 2 of 2 NECA 340-414-500 Revision 2.0
TCP-015 MCU 5000A Multipoint Control Unit
This page is for your notes. 

NECA 340-414-500 Revision 2.0 Page 1 of 4
MCU 5000A Multipoint Control Unit TCP-016
 START-UP OF MCU CONSOLE
GENERAL:
This procedure provides instruction for turn-up of MCU.
APPARATUS: 
None
STEP PROCEDURE REFERENCE NO.
Note:  
MCU console is required the specifications as following.
A.  Physical Interface
• RS-232 interface port (serial interface port) of both the MCU 5000A and 
the MCU console are equipped with the D-sub 25-pin connector con-
forming to EIA RS-232C.
• Up to 3 consoles can be connected...

Page 2 of 4 NECA 340-414-500 Revision 2.0
TCP-016 MCU 5000A Multipoint Control Unit
START-UP OF MCU CONSOLE
STEP PROCEDURE REFERENCE NO.
1 Connect reversed cable between RS-232C terminal at rear side of 
MCU 5000A and RS-232C terminal of MCU console by using RS-232C 
cable.  (See Fig. 2) 
2 Set MCU console as below.
• Synchronous mode: Start Stop mode
• Baud rate: 9600 bps
• Character bit length: 8 bit
• Stop bit length: 1 bit
• Parity Check: none
• X control: none
3 Turn on power switch of MCU console....

NECA 340-414-500 Revision 2.0 Page 3 of 4
MCU 5000A Multipoint Control Unit TCP-016
START-UP OF MCU CONSOLE
Figure 1:   Connection of MCU Console to MCU 5000A
Figure 2:   Opening Message
MCU  REAR  TERMINAL  ARRANGEMENT RS-232C
AC  IN
CH1CH5 CH1
CH13
CH9
CH5CH1
CH2CH6 CH2 CH14 CH10
CH6CH2
CH7 CH3 CH3 CH15 CH11 CH7 CH3
CH4 CH8 CH4 CH16 CH12 CH8 CH4
RS-232CHSD  IFL IF
RS-232C MCU CONSOLE
(REVERSE)
PORT
Note 1:  The channel 4 (CH4) at RS-232C interface port does not support RS-232C interface.Note 2:  The...

Page 4 of 4 NECA 340-414-500 Revision 2.0
TCP-016 MCU 5000A Multipoint Control Unit
This page is for your notes. 

NECA 340-414-500 Revision 2.0 Page 1 of 4
MCU 5000A Multipoint Control Unit TCP-017
REPLACEMENT OF UNIT
GENERAL: 
This procedure describes the step of unit replacement.
APPARATUS: 
None
Figure 1:   Open Front Cover
Ta b l e  1 :  
STEP PROCEDURE REFERENCE NO.
1 Turn OFF the power switch of the MCU 5000A.
2 If front cover is already open, go to Step 4.INP-003
3WARNING:
  FRONT COVER SHOULD BE LOWERED (180
o) WITH 
BOTH HANDS ALLOWING COVER TO DROP FREELY MAY DAMAGE 
COVER OR EQUIPMENT BELOW. 

Page 2 of 4 NECA 340-414-500 Revision 2.0
TCP-017 MCU 5000A Multipoint Control Unit
REPLACEMENT OF UNIT
Figure 2:   Remove Unit
STEP PROCEDURE REFERENCE NO.
4 Using index fingers, slide the locking knob to inside of the front cover.
WARNING:  
1. TO PREVENT DAMAGE TO THE ELECTROSTATICS SENSITIVE 
DEVICE USED IN THE MCU 5000A, ALWAYS WEAR A WRIST 
STRAP WHEN REPLACING A UNIT.
2. ATTACH THE 2224 ADJUSTABLE WRIST STRAP OR 
EQUIVALENT TO THE WRIST AND CONNECT TO THE ESD 
CONNECTOR ON THE MCU 5000A.
5 Check...