The Speaker Company TTP 248M service manual TTP-248M Bar Code Printer Power Down Sensor, Vcc

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TTP-248M Bar Code Printer

Service Manual

3.8 Power Down Sensor

1. 9V VCCL

VCC

R118

1

 

U21

 

 

 

 

 

 

1

R116

8

VDD

SW

1

 

L1 8

 

L2 1

 

 

7

2

 

 

 

 

Ip k

SWE

 

 

 

 

R117

1

6

3

 

33 0u

 

0

VCC

TC

 

 

 

 

5

4

 

D10

 

 

 

 

Vref

GND

 

 

 

C21

 

 

 

C72

SS14

 

 

 

 

 

 

 

 

 

 

 

 

34 06 3

 

C8

 

 

 

 

10 uF

 

 

R96

 

10 0p

15 00 pF

C16

C66

C69

 

 

 

 

 

 

0. 1u

47 0u

10 0u /35 V

 

R122

 

1. 9K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3. 6K

 

 

 

 

 

 

 

C76

 

 

 

 

 

 

 

 

 

10 0u F

P_ INT

J2

1

2

R7

4. 42K

U5D

131. 5V

14

12R8

3.6K

LM32 4

 

R4

R6

30 .9k

GND

10 M

R5

 

 

4. 42k

AGND

 

 

Analo g Gro un d

 

 

VMM

 

JP30

 

 

 

2

 

 

 

 

1

 

 

 

 

 

2PIN

 

 

 

GND

 

 

 

 

U20

 

 

 

 

 

SI-80 33 JD

 

L1 7

 

1

 

 

2

 

Vin

SW

 

 

 

 

10 0u

 

 

 

 

 

 

ff

 

Vos

4

 

 

 

 

 

C22

o/O

 

ND

 

 

 

N

 

G

C71

D9

22 0u F

 

 

 

 

 

 

 

SS24

 

 

5

3

15 00 pF

 

 

 

 

C7

 

 

 

 

0. 47u F

 

 

 

 

 

 

GND

 

 

 

 

 

3. 3V

 

 

L2

0

VCC

JP29

 

 

2

 

 

 

 

 

0

 

 

1

 

 

 

 

2PIN

 

 

 

 

GND

C15

C65

 

C68

C75

0. 1u

47 0u

 

10 0u /35 V

10 0u F

3

4

5

6

7

8

9

10

11

11 _PIN

AGND

C73

22 00 u/3 5V

AGND

MGND

Analo g Gro un d

MOTOR_GND

 

U19

 

 

 

 

 

SI-80 50 JD

 

 

L1 6

1

 

 

 

2

Vin

 

SW

 

 

 

 

10 0u

 

 

 

 

 

ff

 

 

Vos

4

 

 

G ND

 

 

N o/O

 

 

 

 

C63

 

 

C70

D8

22 0u /35 V

5

3

 

SS24

 

 

 

15 00 pF

 

 

 

C6

 

 

 

0. 47u F 10V

 

 

 

L2 2

 

0

 

L1 1

GND

 

0

 

L3 7

 

0

 

 

 

5V

 

 

 

L1 9

VDD

 

JP31

 

 

 

2

 

 

 

 

 

0

 

 

1

 

 

 

 

2PIN

 

 

C67

C74

 

C14

C64

10 0u /35 V

10 0u F

GND

0. 1u

47 0u

 

 

 

Fig. 3.6 Power Down Sensor Circuit

PIN U19 ----SJ8050JD is used to provide 5V to CTHP, LCD, motor, connector.

PIN U20 ---- SJ8033JD is used to provide 3.3V to CPLD, memory.

PIN U21 ---- 34063 is used to provide 1.9V to CPU

Vout=1.25(1+R96/R122)

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Contents TTP 248M Table of Content TTP-248M Bar Code PrinterTTP-248M Bar Code Printer Foundamentals about the System Printer OverviewTTP-248M Bar Code Printer Pinter Specification SpecificationCommunication Interface Available Bar Codes Text Specification File Head of Font Fixed 32bytes BF3~4 VF3~4 Specification Types of PaperTTP-248M Bar Code Printer Ribbon Specification Circuit Description MCUMCU MCU PIN Description Page Page Page Page Page Page Page Page TTP-248M Bar Code Printer Reset Circuit Reset CircuitTTP-248M Bar Code Printer Memory System Etro N TechDecoder Circuits Memory Address MapUse by CPU Area Internal I/O Sdram TTP-248M Bar Code Printer Firmware Address Map TTP-248M Bar Code Printer Power Down Sensor VCCTTP-248M Bar Code Printer Print Head GNDMotor System Circuit Stepping Motor PatternTTP-248M Bar Code Printer Sensor Circuits Ribbon Near End Sensor10 Black mark/ Gap Sensor Circuit Peel-off Sensor 11 Peel-off Sensor Circuit Case Sensor Serial Port Circuit GND VDDParallel Port Circuit VDDTTP-248M Bar Code Printer Cutter Drive System 17 Cutter Drive CircuitTTP-248M Bar Code Printer PIN Switch Circuits Connector Circuits21 Memory Card Connector 23 Stepping Motor Connector TTP-248M Bar Code Printer Optional Items Circuits Optional Item---BuzzerMachanism Remove the Covers and LCD PanelLoosen 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 TroubleshootingCalibrate Gap/Black Mark Sensor Flash / DramDiagnosis 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