Kenwood TK-260N Service Manual

Also see for TK-260G: Instruction manual Service manual Instruction manual Service manual Service manual

Contents

TK-260G/(N)/270G/(N)22CIRCUIT DESCRIPTION/SEMICONDUCTOR DATAFig. 10 Control system8. CONTROL SYSTEMKeys and channel selector circuit.The signal from the keys and channel selector are directlyinput to the microprocessor, as shown in fig. 10.SEMICONDUCTOR DATALCD Driver : LC75823W (Display UNIT IC501)(TK-270G only)n Block diagramLATCH & DRIVERSHIFT REGISTERCOMMONDRIVERADDRESSDETECTORCLOCKGENERATORV DDCECLDI V SSOSCINHV DD 2VDD 1COM1 COM2 COM3 S52 S51 S1Pin No. Name I/O Active Function1-52 S1-S52 O - Segment output for displaying datatransferred form serial data.53-55 COM1-COM3 O - Common drive output.Frame frequency fo=(fosc/384)Hz56 VDD - -The display to turn off57 INH I L INT=L : Turn offINT=H : Turn onApply 2/3 the LCD drive bias voltage58 VDD1 I - from outside. If 1/2 the bias is applied,connect to VDD2.Apply 1/3 the LCD drive bias voltage59 VDD2 I - from outside. If 1/2 the bias is applied,connect to VDD1.n Pin function60 VSS - -61 OSC I/O - Oscillation terminal62 CE I H Chip enable. Serial data transfer terminal.Connected to the microprocessor.63 CL I Synchronizing clock. Serial data transfer terminal.Connected to the microprocessor.64 DI I - Transfer data. Serial data transfer terminal.Connected to the microprocessor.Pin No. Name I/O Active FunctionUPB1509GV (IC301)n Pin connection diagram12345678D QQCLKD QQCLKD QQCLK OUTININSW1 SW2Pin No. Pin Name1 VCC12 IN3 IN4 GND5 SW16 SW27 OUT8 VCC2n Block diagramPin Pin Applied Pin Functions and usesNo. name voltage voltage1 VCC1 2.2-2.5 - Power supply voltage pin for the input amplifier section anddivision circuit. Connect a bypass capacitor to this pin to reducethe high-frequency impedance with the ground (for example, 1000 pF).2 IN - 1.7-4.95 Signal input pin. Connect a coupling capacitor to this pin forDC cutting with an external circuit (for example, 1000 pF).3 IN - 1.7-4.95 Input signal bypass pin. Connect a bypass capacitor to thispin to reduce the high-frequency impedance with the ground(for example, 1000 pF).4 GND 0 - Ground pin. Connect it with the ground pattern. The groundpattern on the PC board should be wide enough to minimizeimpedance.5 SW1 H/L - Division ratio setting pin. The division ratio can be set by thefollowing voltage:6 SW2 Connect a bypass capacitor to this pin to reduce the high-frequency impedance with the ground.7 OUT - 1.0-4.7 Division signal output pin. Emitter follower output. 0.1 Vpf ormore can be output under 200-ohmload. Connect a couplingcapacitor to this pin for DC cutting with an external circuit(for example,1000 pF).8 VCC2 2.2-5.5 - Power supply voltage pin for the output buffer circuit. Connecta bypass capacitor to this pin to reduce the high-frequencyimpedance with the ground (for example, 1000 pF).SW2H LSW1 H 1/2 1/4L 1/4 1/2n Pin FunctionChannel selectorIC13-COMCN501CN1TK-270GTK-260GEN187325EN3EN2KOUT0KOUT1KOUT2KOUT3KIN0KIN1KIN2KIN3KIN41627KEYADPTTMONISWLAMPSWPTTSW1 2 3 A4 5 6 B7 8 9 C∗ 0 # D5M47k47k100k