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.