UBI EasyCoder 501 – Service Manual162Parallel Interface Board 1-971704-4122. PARALLEL INTERFACE BOARD, cont'd.22.5Circuit Diagram1/STROBE 274AC004574AC00C93STROBE'2+5V 1CLRBUSY1514R174HC423+5VS36& STROBES2IC8B3&IC8A74HC7410 S 9 STROBE'12 1D11 > C1 8+5V 13 RIC5BCR/C13 /ACK& 4RIC6A74HC374STROBE 11 CLKRDDATA 1 OED7 13D6 8D5 14D4 7D3 17D2 4D1 18D0 3+5.3V+5VD1C10 C4C3C2C1 C5 C6 C71110C897674HC423CR/C5& 12RIC6B/ACKIC1 AD7D AD02 AD6D AD119 AD5D AD25 AD4D AD316 AD3D AD46 AD2D AD515 AD1D AD69 AD0D AD712WRSTATS1R2IC5AR1/RESET 6C1>3 1D2 5S4 74HC74DREADYIC8D12& 1113+5V74AC00+5V12 3/STROBE74AC37411 CLK1 OE3 2 PED18 19 /ERRORD4 5 ST1D17 16 ST2D7 6 ST3D14 15 SELECTD8 9D13 12 TESTIDDIC2BUSYIC8C9& 8 ACK1074AC00 /SLCTIN/INPRM9745638RN41+5V10987654RN3BUSY F1F2F3F4F5F6F7F8F9F10F11F12F1310 2F14F15F16F17F18+5V R3 F19F20GNDC CONNECTED TO CHASSIS GROUND( MOUNTING HOLES ON CONTACT )P2+5VP11192203214225236247258269271628P129303412321415331311103518313617P13738ADBUSGNDI26-12V25A124+12V23A322A221A420/RESET19GND18+5.3V17NMIHPC16X115X014RD13WR12XINT11CSX110CSX09AD08AD77AD16AD65AD24AD53AD32AD41P4+5V 1+5V 174HC367BPOLL 15 EN1214IC7B74HC367APOLL 1 EN/SLCTIN 10/INPRM 6TESTID 4DREADY 2IC7AAD03 A4AD15 CSX0AD27 RDAD39A3A2A1AD413AD511A4CSX0WR10AD79 A3AD68 A2AD57 A1AD46AD35AD24AD13AD02RN2A12A23A34A45910RD6WR7CSX08RN174HC138DX1 15 WRSTAT0 02 0 14 CLRBUSY1 G 173 132 2 1234 114&5 1056 96 77IC374HC138DX1 15 RDDATA0 02 0 14 POLL1 G 173 132 2 1234 114&5 1056 96 77IC4
