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LED 1 GBR Line Code Recognition (8051) Board LED 4 LED Indicators: LED1 (top) LED2 LED3 LED4 (bottom) Lo to Hi Comparator Hi to Lo Comparator Probe B Probe A Test Points: T1 Ground T2 +5VDC T3 Probe A Preamp T4 Probe B Preamp T5 Lo to Hi Interrupt T6 Hi to Lo Interrupt T7 Read Signal T8 Lo to Hi Comparator T9 Hi to Lo Comparator GBR Line Code Board Figure SMART FEEDER SERVICE MANUAL ISSUE 09/00 REPAIR INFORMATION SECTION D – PAGE 33