.LOG
Fuel Injection Board
9:50 AM 5/25/2007

Note:  The connectors are not numbered so I'm not sure whether to 
       number them from right to left or left to right. 

Components:

IC1 - SX28 (MCU)
      pin 18, RC.0 test point
      pin 19, RC.1 test point


IC2 - PCF8591 (I2C A/D. 5V)

IC3 - PCF8591 (I2C A/D, 2.5V)
      unknown destination for pin 13

IC4 - MOSFET MIC4422

IC5 - MOSFET MIC4422

IC6 - MOSFET MIC4422

IC7 - MOSFET MIC4422

IC8 - 24C32 I2C 4K EEPROM,
      need to determine I2C address from code

Clock - Transko SXO-550-H-100-ET
      http://www.transko.com/catalog_pdf/catalog_pdf_7-10-05/oscillators/pdf/sxo.pdf

Q1 - KA317 (Adjustable Voltage Regulator)

Q2 - 7805 or LM2940 (5V Voltage Regulator)

Q3 - Transistor, 2N3906? - not sure of its purpose

D1 - Diode 1N4001

R1 - 4.7K pull-up resistor for I2C network SDA (SX28, RC.6)

R2 - 4.7K pull-up resistor for I2C network SCL (SX28, RC.7)

R4 - ??? used with R22, pull-up for IC3,pin13

R5 - ??? used with Q3 transistor 

R6 - ?72 used to adjust voltage on Q1

R7 - ?72 used to adjust voltage on Q1

R9 - 10K, pull-up for SX28 MCLR

R10 - 6.6K, pull-up for SX28 pin 21

R11 - 6.6K, pull-up for SX28, pin 22

R22 - 1K used with R4, pull-up for IC3,pin13

C1 - 100uf? - voltage regulation

C2 - 100uf? - voltage regulation

C3 - 100uf? - voltage regulation

RB1 - Connector to SX28 Port B pins

AN1 - Connector

SIL3 - Connector (presumably power in)

SIL4 - connector (A OUT)

PW1 - selects power source (direct or 5V?), 
      can't figure out where pin 2 goes to.

JP1 - selects between IC4 and IC5

JP2 - selects between IC6 and IC7

SR8 - selects between transistor base and SX28 pins RC4,5?

SL1? - looks like a test point

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