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-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...

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...

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...

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....

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,...

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...

Page 2 of 2 NECA 340-414-500 Revision 2.0
TCP-013 MCU 5000A Multipoint Control Unit
This page is for your notes.