Radio Shack HTX-400 Service Manual

Also see for HTX-400: Owner's manual Owner's manual

Contents

17No. PIN NAME REMARKS DESCRIPTION ACTIVE38 VASS AD REFERENCE LOW VOLTAGE39 VAREF AD REFERENCE HIGH VOLTAGE40 VDD VDD41 P70(SEG31) OPEN DRAIN AUDIO PROTECT (IN)42 P71(SEG30) OPEN DRAIN PTT KEY (IN) PUSH:”H”43 P72(SEG29) OPEN DRAIN OPTION VIBRATOR (IN)44 P73(SEG28) OPEN DRAIN SIGNAL MUTE (OUT)45 P74(SEG27) OPEN DRAIN CLOCK SHIFT (IN)46 P75(SEG26) OPEN DRAIN MODEL SELECTOR (IN)47 P76(SEG25) OPEN DRAIN OPTION H/L (IN)48 P77(SEG24) OPEN DRAIN EEPROM CONTROL (OUT)49 SEG23(P60) LCD SEGMENT OUTPUT50 SEG22(P61) LCD SEGMENT OUTPUT51 SEG21(P62) LCD SEGMENT OUTPUT52 SEG20(P63) LCD SEGMENT OUTPUT53 SEG19(P64) LCD SEGMENT OUTPUT54 SEG18(P65) LCD SEGMENT OUTPUT55 SEG17(P66) LCD SEGMENT OUTPUT56 SEG16(P67) LCD SEGMENT OUTPUT57 SEG15(P90) LCD SEGMENT OUTPUT58 SEG14(P91) LCD SEGMENT OUTPUT59 SEG13(P92) LCD SEGMENT OUTPUT60 SEG12(P93) LCD SEGMENT OUTPUT61 SEG11 LCD SEGMENT OUTPUT62 SEG10 LCD SEGMENT OUTPUT63 SEG9 LCD SEGMENT OUTPUT64 SEG8 LCD SEGMENT OUTPUT65 SEG7 LCD SEGMENT OUTPUT66 SEG6 LCD SEGMENT OUTPUT67 SEG5 LCD SEGMENT OUTPUT68 SEG4 LCD SEGMENT OUTPUT69 SEG3 LCD SEGMENT OUTPUT70 SEG2 LCD SEGMENT OUTPUT71 SEG1 LCD SEGMENT OUTPUT72 SEG0 LCD SEGMENT OUTPUT73 COM3 LCD COMMON OUTPUT74 COM2 LCD COMMON OUTPUT