Star Micronics TSP200 technical manual Power-On Reset Circuit

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PRINCIPLES OF OPERATION

2-4. Power-On Reset Circuit

The power-on reset signal initializes all elements so as to protect against possible operating errors at power-on. The signal is held for approximately 160ms when power comes on. The reset circuit is shown below.

Fig. 2-13 Power-On Reset Circuit

+5V

+

C9

	+5V
IC3	+5V
IC3
	VCC
CD	OUT
	GND

Drive circuit IC1 : CPU

CPU

RESRESO

+5V

+5V

IC4

RESET

Gate array

RESET IC

D1

Fig. 2-13 Power-On Reset Circuit

1At power-on, voltage detector IC3 (M51953BL) outputs a LOW signal from its OUT terminal. The signal is held for approximately 160ms by the action of capacitor C9 (0.47µF), in accordance with the following relation:

T = 0.34 × C9 (pF) [µs] = 160ms

2The LOW signal generates reset of the CPU and gate array, and stops operation of the mechanism drive circuitry.

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Contents TSP200 Series Page Introduction Page Chapter Specifications and Operation Page General Specifications Specifications and OperationTSP200-120/230 External AppearanceDIP switch #1 Factory settings of DIP switch 1 are all on DIP-Switch SettingsSpecifications and Operation Specifications and Operation Running a test print HEX dump modeChapter Principles of Operation Page Principles of Operation Block DiagramPrinter Mechanism Interface Types InterfaceCPU Arrangement Data Arrangement and PrintingSTROBE1 STB1 STB2 STB3 Timing Chart Feed-Motor Drive Circuit 10 Motor Control by Phase 1-2 Excitation12 Pulse Width by Pattern 13 Power-On Reset Circuit Power-On Reset Circuit14 Equivalent Circuit, Voltage Detection IC +5V Line Voltage Detector CircuitThermal Printhead Printer MechanismPaper-Feed Mechanism Paper-Out Detector Detectors21 Cover-Open Detector Auto-Cutter Drive circuit on TSP242-24/120/230 only23 Auto-Cutter Timing Chart Chapter Part Replacement and Related Adjustment Page Auto-Cutter Unit Upper Case UnitTSP242-24/120/230 Near-End-Sensor UnitPower Unit TSP200-24 Power Unit TSP200-120/230Fuses TSP200-120/230 Main Logic BoardThermal-head Unit Fuses TSP200-24Page Chapter Maintenance and Lubrication Cleaning MaintenanceChecks Lubricants LubricationApplication Method Lubrication PointsPage Chapter Parts List Disassembly Drawing Printer AssemblyAFG 29 H Printer AssemblyTSP200-120/230 Parts List TSP200-120/230TSP200-24 Printer AssemblyTSP200-24TSP212 TSP242 Printer Mechanism Parts ListCutter Unit ACS-230STR Wiring Scheme of Printer STB1 VCC Gndh GND Init Error Slct CN7 Circuit Diagram Main Logic Board 2/6 Main Logic Board 3/6 Main Logic Board 4/6 Main Logic Board 5/6 Main Logic Board 6/6 Component Layout Main Logic Board RESIS. Array Chip Chip Resistor 4.7 K-OHM 1/10W DRWG.NO REV Parts no Parts Name ’TY Remarks Rank CN8 Power Supple Unit 120VAC/230VAC Power Supply Unit120VAC/230VAC Circuit Diagram Component Layout Parts List Power Supple Unit 24VDCPaper Near-End Sensor Page Distributed by