NEC Mcu 5000a Multipoint Control Unit Equipment Manual

NECA 34 0-4 14- 500 Revision 2.0   Page 13 of 14
MCU  5000A Multipoint Control  U nit   INT-001
9.  HANDLING OF BACKUP MEMORY B ATTE RY IN M CONT UNIT
A
+?
CN 2
C7C8
ON
As seen for A
OPER ATING CONDITION  24-H OUR DISCHARGE  8 HOUR/E AC H TIME DISCHARGE 

Page 14 of 14   NECA 3 40-4 14- 500 Re vis ion 2.0
INT-001   MCU 5000A Mult ipoint Con trol Unit
D . Re placement of  

NECA 340-414-500 Revision 2.0 Page 1 of 4
MCU 5000A Multipoint Control Unit TCP-001
CHECK ON POWER SYSTEM
GENERAL: 
Check on  AC power supply and output voltages of PWR Unit is 
conducted.
APPARATUS:
Digital Multimeter (DDM)
STEP PROCEDURE REFERENCE NO.
1 Turn ON the power switch of the MCU 5000A.
2 Is POWER LED of PWR Unit lit?
If YES
, go to Step 10
.
If NO
, go to Step 3
. 
3 Set Digital Multimeter (DDM) range  to measure 300 VAC.
4 Turn DDM power switch to ON.
5 Connect DDM test cord between DDM and...

Page 2 of 4 NECA 340-414-500 Revision 2.0
TCP-001 MCU 5000A Multipoint Control Unit
CHECK ON POWER SYSTEM
Figure 1:   Checking AC Line Voltage
STEP PROCEDURE REFERENCE NO.
14 Does output voltage meet specified figure of +4.75 V through + 5.25 VDC?
If YES, go to 
Step 15.
If 
NO, go to 
Step 18.
15
CAUTION:  
BE CAREFUL OF THE POLARITY OF THE VOLTAGE 
CHECK TERMINAL.
Connect one end of the test cord to the DDM and other end to the power 
terminal of PWR unit. (See Fig. 2)
16 Confirm that the measured...

NECA 340-414-500 Revision 2.0 Page 3 of 4
MCU 5000A Multipoint Control Unit TCP-001
CHECK ON POWER SYSTEM
Figure 2:   Checking DC Output Voltage of PWR Unit
MON
CONF
B A
LMT    MON
OFFON
   MEM
MCU 5000A
PWR
19 990
+12VDC
+5 VDC
G
-12 VDC 

Page 4 of 4 NECA 340-414-500 Revision 2.0
TCP-001 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-002
IMPLEMENTATION OF C&I LOOPBACK FUNCTION
GENERAL: 
Operate a C&I remote loopback on specified terminals of VL 5000 using RLCS
 
command referring to NECA 340-414-300
.
APPARATUS: 
MCU console
STEP PROCEDURE REFERENCE NO.
1 Has the MCU console been started up?
If YES
, go to Step 3
.
If NO
, go to Step 2
.TCP-016
2 Start up the MCU console and put it into communication state.TCP-016
3 Decide the number  (1 to 8) of...

Page 2 of 2 NECA 340-414-500 Revision 2.0
TCP-002 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-003
  SETTING OF MCU 5000A LOOPBACK POINTS
GENERAL: 
Set MCU loopback on specified point of MCU 5000A using STLP
 
command, referring to NECA 340-414-300
.
APPARATUS: 
MCU console
STEP PROCEDURE REFERENCE NO.
1 Has the MCU console been started up?
If YES
, go to Step 3
.
If NO
, go to Step 2
.
2 Start the MCU console up and put it into communication state.TCP-016
3 Decide test loopback points A to H shown in Fig.1.
4 Enter...

Page 2 of 2 NECA 340-414-500 Revision 2.0
TCP-003 MCU 5000A Multipoint Control Unit
Figure 1:   MCU 5000A Loopback Point
RELAY IPAF MTSC
MTSC MTSCMTSC
PN
CHECKER
PN
GENERATOR
POINT A
POINT B
POINT C POINT D POINT E
POINT F1.5M LIF UNIT EC H221 MUX UNIT
V SW/LSD UNIT
HSCX
A CODEC POINT H POINT G
RELAY MTSC
MTSC MTSCMTSC
PN
CHECKER
PN
GENERATOR
POINT A
POINT B
POINT C POINT D POINT FRS-422 LIF UNIT EC H221 MUX UNIT
V SW/LSD UNIT
HSCX
A CODEC POINT H POINT G
(a)  In case that MCU 5000A consists of 1.5M LIF...