J303 (Print Head 3/3 [Carriage Unit])J501 (LF Encoder)No. Signal name Function Input /Output1 AB_PWR Ink tank sensor chip power supply OUT2 AB_DATA Ink tank sensor data power supply BUS3 AB_PWR Ink tank sensor chip power supply OUT4 AB_CLK Ink tank sensor data transfer clock signal BUS5 THERMO Carriage temperature sensor signal IN6 H_ENB2 Head heat enable signal 2 OUT7 HD9_Y2 Head data (Y2) OUT8 HD13_C2 Head data (C2) OUT9 HD11_M2 Head data (M2) OUT10 HD12_SC2 Head data (SC2) OUT11 HD10_SM2 Head data (SM2) OUT12 ROM_DIO Head EEPROM input - output data IN/OUT13 SGND System ground -14 H_CLK Head data transfer clock signal OUT15 SGND System ground -16 ROM_SK Head EEPROM serial clock signal OUT17 HLAT Head data latch signal OUT18 HD8_Y1 Head data (Y1) OUT19 ROM_CS Head EEPROM chip select signal OUT20 HENB1 Head heat enable signal1 OUT21 HENB3 Head heat enable signal 3 OUT22 HD2_C1 Head data (C1) OUT23 HENB0 Head heat enable signal0 OUT24 HD0_K1 Head data (BK1) OUT25 HD4_M1 Head data (M1) OUT26 HD1_K2 Head data (BK2) OUT27 HD5_SM1 Head data (SM1) OUT28 HD3_SC1 Head data (SC1) OUTNo. Signal name Function Input /Output1 GND Ground -2 ENCA LF encoder phase A IN3 VSEN Sensor power supply +3.3V OUT4 ENCB LF encoder phase B IN3-3