Cata-Dyne™ Infrared Oven

Operation and Instructional Manual - Identification

CPU Board Identification

Refer to drawings TC_MEAS1, 2, 3 or 4 accompanying this document.  There are two types of CPU cards in use today: the older 2nd generation card and the current 3rd generation card.  The 2nd generation CPU card has a board number of L147a0 or L147a1 and can be identified in that it has a tab-type voltage regulator fastened to a black heat sink with a square-head (Robertson) screw and has an 18 pin CPU chip.  The 3rd generation CPU card has a board number of L147b0, L147b1, L147b2, L147b3 or L147b4; does NOT have a heat sink; and has a 28 pin CPU chip next to an 8 pin EEPROM chip.  The CPU chip and EEPROM chip are the only socketed chips on the board.

The signal common point on the 2nd generation CPU board is the screw holding the voltage regulator to its heatsink.  Hold the negative (black) lead of the meter to this point.

The signal common point on the 3rd generation CPU board is the left most (GND) terminal of the 3 pin connector at the top of the CPU card marked “GND RX TX” or “GND TX RX” (Rev a or Rev b card).  Connect the negative (black) lead of the meter to this point.

The CPU card 4 wide screw terminal blocks connecting to the thermocouple pre-amps are different for X-proof systems and standard systems.  The terminal blocks are mounted on the CPU card slightly differently and the pins have different functions.

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