NEC NP-NC900C-A, Руководство по обслуживанию

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11-5
CIRCUIT DESCRIPTION
“Confidential, Do Not Duplicate without written authorization from NEC.”
Circuit symbol PWB LAN I/F
A1J1/A1J2/A1J3 ICP M6000
A2J1/A2J2 LEGACY INTERFACE or IMB M6001
A3J1/A3J2 MMOUT or IMB M6002
A4J1 CPU M6003
A5J1 PJDIV –
* When multiple circuit symbols are provided, the number of items used applies to a single
board (for example: 3 slots occupied for a single piece of ICP).
A2J2 and A3J2 are the board-attributable slots. All lines OPEN.
MOTHER PWB Circuit Operation
The Mother PWB (PWC-4708) is a board intended to make major board connections and relaying for the
establishment of the projector functions.
1. Board connections and relaying
Each board is installed in the slot specified below.
The slot is a general-purpose PCle connector and its board side is of the card edge type.
Inter-board control is carried out through the LAN and each slot is provided with an independent RJ45
connector.
2. FSB connections
The FSB is connected among all line ICPs.
1
Video, control
The three connectors of M6001, 6002, 6003 are connected with the six twist-pair cables through the
repeater board “INTERVENE PWB.”
The INTERVENE PWB is a board intended for the speedy connection and disconnection of cables for
maintenance servicing and others.
2
Power supply
The 12V, 3.3V, and 2.5V power of the PO6000 is fed to each FSB through branch cables.
The 3.3V and 2.5V power is used for DC/DC converter output relaying on the ICP.
3. POWER
The input power supply of +12V DC is fed to the PO6010 where it is branched and distributed to the
respective slots and boards.
4. Outlined bus lines
1
Video system
Input A-ch: A3J1 (Mother Board lower-stage input slot) > Mother A1J1 > ICP
Input B-ch: A2J1 (Mother Board upper-stage input slot) > Mother A1J2, A1J1 > ICP
Output: A1J3 (ICP) > PO6001-6003 (FSB*3)
2
Control
A4J1 (CPU) – A5J1 (PJDIV)
A4J1 (CPU) – A1J2 (ICP