chart plate to expose the main microprocessor PC board of the recording unit. Otherwise, your recording unit will have a hinged chart plate held in place by two (2) screws located in the upper and lower right hand corners of the chart plate. Remove these two screws and open the hinged chart plate. On 8" enclosures, there is a single screw along the right hand edge that secures the chart plate inside of the enclosure. Loosen this screw and open the hinged chart plate.

If you are not sure how to access the back of the chart plate, please contact COBEX Recorders before continuing.

Next, you will need to determine the type of micro- processor controller PC board that is installed in your recorder. Refer to Figures 2A and 2B and compare these figures to the microprocessor controller PC board that is installed in your recorder.

 

TYPE "B" CONTROLLER PC BOARD

If your recorder has a Type B microprocessor controller PC board installed, then locate screw terminal block locations J3 and J4 on the microprocessor PC board. These screw terminal blocks are used to provide a signal input to the recorder for up to two pens. Note: Not all positions shown will have a terminal block installed (only the inputs being used). Refer to Figure 2A for the location of J3 and J4 on the micro-controller PC board. Position "VIN" (located on screw terminal block J4) is used to provide a linear voltage signal input to the recorder, position "+5V" can be used to power an external probe.

 


Figure 2A: Micro-Controller PC Board (Type B).

TYPE "C" CONTROLLER PC BOARD

If your recorder has a Type C microprocessor controller PC board installed, then locate screw terminal block location J3 on the microprocessor PC board. This screw terminal block is used to provide a signal input to the recorder for one pen. Note: Not all positions shown will have a terminal block installed (only the inputs being used). Refer to Figure 2B for the location of J3 on the micro-controller PC board.


 Figure 2B: Micro-Controller PC Board (Type C).


4

R70-32
REV(07/13) E

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