Daily Archives: September 20, 2016

How to Replace the Satellite Card of the SRCU Board in the BITSV3

Issue Description

Q:
The satellite card of the SRCU board of the BITS V3 is a sub-card. If the satellite card is faulty,

the replacement method is as follows:

the replacement method

the replacement method

Alarm Information

Null

Handling Process

A:

In the slide of the BITS V3 hardware architecture, only the logical diagram inside the board is provided,

without internal structure of the SRCU board. Many engineers do not see this board and cannot handle

relevant problems.

SRCU board

SRCU board

Figure 1 GPS satellite card component

GPS satellite card

GPS satellite card

Figure 2 Installation location of the SRCU/SOCU satellite card

SRCU/SOCU satellite card

SRCU/SOCU satellite card

Figure 3 Rubidium clock partition board
To replace the board, perform the following steps:
1. Use the board component as shown in Figure 1 to install in the position as shown in Figure 2. Insert

the board in socket correctly. The board component is inserted in the SRCU or SOCU board.
2. Pick 4PCS M3 x 6 screws (26010420). Use the 3.0kgf.cm screwdriver to tighten the sub board in the

positions of M15, M16, M17, and M18 in the stud. It should be noted that the rubidium clock partition

board is installed on the side of the rubidium clock, that is, M16 and M17 stud.
3. The GPS/GLONASS dual-satellite receive card is installed in the same way as that of the rubidium

clock partition board. A partition board is not required in the GPS/GLONASS dual-satellite card.

GPS/GLONASS dual-satellite card

GPS/GLONASS dual-satellite card

Root Cause

Null

Suggestions

Null

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