Support Engineering Group : High Resolution PH Meter Assembly Instructions This page last changed on Sep 24, 2009 by kgomes. ## pH Meter Assembly Instructions Don't cut the leads on the Temp sensor AD22103 - Mount standing up with 0.25" leads to insure close proximity to housing. Use a 0.25" Teflon sleeve on the center leg. Teflon sleeves on the outer row of the right angle 2x7 JTAG connector (prevent shorting to housing) Lift pins on U21 - 3 and 6. Bend straight out. Stuff 1x10 header on pH meter / controller board, do not solder header to analog front end board (deliver as two pieces) Implement the following Engineering Change Notifications (ECN's) ECN #1 Schematic Mistake on U8 LM337 to fix VAAiso- connection to Vin of LM337 (should be Vout) Cut trace under C34 going to the non-stripe end of C34 Drill hole on pin 8 J17, tube the hole with teflon tubing Connect U8 - pin 1 to J17 - pin 8 and non-stripe end of C34 ECN #2 Silk screen on rev 1.0 shows opposite polarity for C66 - stuff backwards to silkscreen ECN #3 Connect U14- pin22 to U14 - pin 30 ECN #4 Connect C60 Anode to C54 Anode ECN #5 C32 and C33 have wrong polarity on silkscreen stuff opposite ## PCB Fabrication MATERIAL TYPE: FR4 or 370HR UNIT DIMENSIONS: 08.500 By 01.400 MATERIAL THICKNESS: 0.062" ARRAY DIMENSIONS: 00.000 BOARD FINISH: SMOBC ARRAY NUMBER UP: 0 COPPER WEIGHT: 1 oz ARRAY QTY: 0 INNER COPPER WEIGHT: 1.0 TAB ROUTE: YES SOLDER MASK SIDE: Both Sides SCORING: NO SOLDER MASK COLOR: Green E.TEST OPTION: NO LEGEND SILK SCRN: Top Side 5% OVERAGE: yes LEG SILK SCRN COLOR: White ## pH Meter Board House Package Schematic and Parts Placement diagrams Bill of Material Parts Kit with PCB Deliver to Indtec ## pH Meter Board Inspection Visual inspection: compare against 'example board' for missing or mis-placed parts Errors found on Indtec board #1 Some tantalums are missing (6 of them) ECN for tantalum reversal not done (in backwards) ECN #1 not done correctly - trace not cut underneath C34 (V- measures -15v) Tantalum caps are missing (spares not retured from Indtec or lost or obscounded) R79 not stuffed (assembly error) - causes no clock to processor R69, R70 need 10 ohms, schematic incorrectly has 100K JTAG connector stuffed on wrong side of board - JTAG Emulator can't see device, USB FET sees low voltage Connect +12v, GND, RX and TX to controller board external interface (next to metal band) Connect a 4.5 Digit voltmeter to VPH and GND on controller board external interface Connect "Calibrations Inc" voltage standard to VPH and GND on J17 Attachments: Foce_Build_Jan_2009a.zip (application/x-zip-compressed)

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