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Installing PCBs

2-2 ◆ Section 2: PCB Installation DS2000 Hardware Manual

Installing PCBs

Central Processing Unit (CPU) PCB

The CPU PCB (Figure 2-1) provides:

● The system’s central processing, stored program and memory for the customer’s site-speciﬁc data.

● PC Interface Card.

● Conference circuits, DTMF receivers and DTMF generators.

● External music input and on-board synthesized music source.

● External paging output and associated relay.

● Real Time Clock.

● Battery for short term (14 day) backup of the customer’s site-speciﬁc data.

Installing the CPU

The CPU PCB installs in the CN0 slot in the Main Equipment Cabinet.

To install the CPU PCB (Figure 2-2) (Figure 2-3):

1. Slide the Mode Switch to the

RUN position.

2. Insert the battery (Sony CR2032 or NEC P/N EX0254-0040) into the battery clips.

3. Plug the CPU into slot CN0.

Figure 2-1: CPU PCB

Figure 2-2: Setting Up the CPU

80000 - 26

Refer to Section 4, Optional Equipment for instructions on

connecting the music source, External Paging, and the auxil-

iary relay.

Mode Switch

Battery

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