The Speaker Company TTP 248M TTP-248M Bar Code Printer Sensor Circuits, Ribbon Near End Sensor

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TTP-248M Bar Code Printer

Service Manual

3.11 Sensor Circuits

Ribbon Near End Sensor

The voltage of sender (PIN 3) is about 1.18V (1.17V~1.19V).

When the sensor detects the black area, the voltage of receiver (PIN 2) is2.10V.

When the sensor detects the white area, the voltage of the receiver (PIN 2) is1.26V.

 

 

U3F

U2/1 19

12

13

 

 

 

 

74 HC14

VCC

R67

R64 10 0

10 0JP2

4

3

2

R251

10 K

GND RNE_ END

Fig. 3.9 Ribbon Near End Sensor Circuit

GAP Sensor

1.Selecting MANUAL GAP and adjust the tension.

When the tension increases, the voltage of the sender (PIN 5) will decrease; when the tension decreases, it will increase.

If adjust the voltage of PIN 5 between tension 000~255, it will alter between 4.4V~3.7V.

2.Selecting AUTO GAP to detect label will get a value of tension, and then selecting the MANUAL GAP.

When sensor detects the paper:

LCD displays Not Throughthe voltage of receiver (PIN 2)2.10V When sensor detects the gap or does not detect paper:

LCD displays Through the voltage of receiver (PIN 2)1.26V

Black Mark Sensor

Selecting MANUAL Bline, and adjust the tension.

When the tension increases, the voltage of the sender (PIN 6) will decrease; when the tension decreases, it will increase.

If adjusting the voltage of PIN 6 between tension 000~255, it will alter

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Contents TTP 248M TTP-248M Bar Code Printer Table of ContentTTP-248M Bar Code Printer Printer Overview Foundamentals about the SystemSpecification TTP-248M Bar Code Printer Pinter SpecificationCommunication Interface Available Bar Codes Text Specification File Head of Font Fixed 32bytes BF3~4 VF3~4 Types of Paper SpecificationTTP-248M Bar Code Printer Ribbon Specification MCU Circuit DescriptionMCU MCU PIN Description Page Page Page Page Page Page Page Page Reset Circuit TTP-248M Bar Code Printer Reset CircuitEtro N Tech TTP-248M Bar Code Printer Memory SystemMemory Address Map Decoder CircuitsUse by CPU Area Internal I/O Sdram TTP-248M Bar Code Printer Firmware Address Map VCC TTP-248M Bar Code Printer Power Down SensorGND TTP-248M Bar Code Printer Print HeadStepping Motor Pattern Motor System CircuitRibbon Near End Sensor TTP-248M Bar Code Printer Sensor Circuits10 Black mark/ Gap Sensor Circuit Peel-off Sensor 11 Peel-off Sensor Circuit Case Sensor GND VDD Serial Port CircuitVDD Parallel Port Circuit17 Cutter Drive Circuit TTP-248M Bar Code Printer Cutter Drive SystemConnector Circuits TTP-248M Bar Code Printer PIN Switch Circuits21 Memory Card Connector 23 Stepping Motor Connector Optional Item---Buzzer TTP-248M Bar Code Printer Optional Items CircuitsRemove the Covers and LCD Panel MachanismLoosen the three screws on Top Left Side Cover Screw LCD Panel Lower Front Cover TTP-248M Bar Code Printer Replacing the Mainboard TTP-248M Bar Code Printer Replacing the Power Supply Unit Belt Ring of Label Rewind Spindle Remove the E-ring of pulley. And then, remove the pulley TTP-248M Bar Code Printer TTP-248M Bar Code Printer Replacing Ribbon Supply Spindle TTP-248M Bar Code Printer TTP-248M Bar Code Printer Replacing Label Supply Spindle TTP-248M Bar Code Printer TTP-248M Bar Code Printer Replacing Label Rewind Spindle TTP-248M Bar Code Printer TTP-248M Bar Code Printer Replacing Platen Remove the Platen and Left Shaft Bearing TTP-248M Bar Code Printer Replacing Motor TTP-248M Bar Code Printer TTP-248M Bar Code Printer Replacing Print Head Remove the 2 screws these are on the TPH switch plate Remove A.B.C.D in order Loosen M4 screw, knob E and F TTP-248M Bar Code Printer Replacing Gap/Black Mark Sensor TTP-248M Bar Code Printer Reassemble in the reverse procedures after replacing Curly plastic pipe Screws Troubleshooting TroubleshootingFlash / Dram Calibrate Gap/Black Mark SensorDiagnosis Operation Procedure TTP-248M Bar Code Printer Self-testDram Clear TTP-248M Bar Code Printer Cleaning Print Head Update History No.35, Sec , Ligong 1st Rd., Wujie Township