Honeywell DR 4300 Guide

Form 43-DR-33-75 Page 1 of 3

Model DR 4300

Circular Chart Recorder

Replacement Instruction

Digital Input Printed Wiring Assembly (51404566-501)

Document Number Form: 43-DR-33-75

Effective: 3/98

Supersedes: None

Kit Contents This kit contains a Digital Input Printed Circuit Board.

Summary Enclosed is a new digital input board for your DR4300 recorder. Use the

following procedure to install the new board in your recorder.

WARNING Never access components inside the case with power applied.

Continued next page

Kit Instruction, continued

Page 2 of 3 Form 43-DR-33-75

Component Location Refer to Figure 1 for the component locations and Table 1 for the

installation procedure.

24225

Digital

Input

Board

Main

Board

Terminal Ground

on Main Board

TB1

Stand-offs

Figure 1 – Component Location

Kit Instruction, continued

Form 43-DR-33-75 Page 3 of 3

Installation Procedure Follow the procedure in Table 1 to install the new digital input printed

wiring assembly in your recorder.

Table 1 – Digital Input PWA Installation

Step Action

1Power down the recorder. Open the chart door and swing the

chart plate out. This permits access to the Main printed

circuit board.

2 Locate the Digital Input printed circuit assembly (PCA)

mounted on top of the pen channel’s printed circuit assembly

on three plastic stand-offs.

3 Disconnect the field wiring from P30 on the old digital input

PCA.

4 Disconnect the power cable from J9 on the old digital input

PCA. You can leave it attached to J13 on the main PCA

unless you are also replacing the cable.

5 Disconnect the processor interface cable from P7 on the old

digital input PCA. You can leave it attached to J10 on the

main PCA unless you are also replacing the cable.

6 Loosen the digital input ground wire (WG) from the ground

terminal located on the main PCA.

7 To remove the old digital input PCA, use needle-nose pliers

to squeeze together the split top of the stand-off on the left

and slide the PCA off the stand-off. Repeat for the center and

right stand-offs.

8 Position the new digital input PCA on the stand-offs and

press it into place.

9 Replace the cable plugs, terminal block, and ground wire

disconnected in Steps 3 through 6.

Table of contents

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