Alpha 3R User Manual
i
SERVICE
MANUAL
Alpha-3R
Direct Thermal Portable Printer
ii
Contents
1. FUNDAMENTAL OF THE SYSTEM ................................ 2
1.1 Overview ........................................................................................................... 2
2. ELECTRONICS ............................................... 3
2.1 Summary of Board Connectors ....................................................................... 3
3. MECHANISM ................................................ 7
3.1 Replacing the Platen Roller (Including media cover) ..................................... 7
3.2 Replacing the Keys Control Board .................................................................. 9
3.3 Replacing the Bluetooth Module (Option) ..................................................... 10
3.4 Replacing the Media Holder Assembly ......................................................... 11
3.5 Replacing the Main Board Assembly ............................................................ 13
3.6 Replacing the Print Head Assembly .............................................................. 14
3.7 Replacing the Stepping Motor ....................................................................... 15
3.8 Replacing the black mark sensor assembly ................................................. 16
3.9 Replacing the WiFi Module (Option) .............................................................. 17
4. TROUBLESHOOTING ......................................... 18
4.1 Common Problems ......................................................................................... 18
5. Maintenance ............................................... 20
Revise History ................................................ 21
2
1. FUNDAMENTAL OF THE SYSTEM
1
2 3 4
5
6
1.1 Overview
Front View
1. LED indicator
2. Feed button
3. Power on/off button
4. Media cover release button
5. Media holder adjustment knob
6. Media cover
3
Interior View
2
1
4
3
5
1. Tear edge
2. Print head
3. Media holder
4. Platen
5. Black mark sensor
2
Rear View
3
2
4
1
5
1. Li-ion battery
2. Battery open clasp
3. USB interface
4. Power jack
5. Interface cover
3
2. ELECTRONICS
Connector
Description
1
LED & KEY board
2
WiFi or Bluetooth module connector
1
3
2
4
5 6 7 8 9
2.1 Summary of Board Connectors
Main board top
4
Pin
Description
1
3.3V
2
BT/WiFi Reset
3
BT RXD
4
BT RTS
5
BT TXD
6
BT CTS
7
WiFi wake up
8
WiFi TCP
9
BT/WiFi Switch
10
GND
3
Stepping motor
Pin
Description
1
OUT1
2
OUT2
3
OUT1
4
OUT2
4
Download F/W connector
Pin
Description
1
3.3V
2
GND
3
RESET
4
BMS
5
NPCS0
6
MOSI
7
MISO
8
SPCK
5
Head open sensor
Pin
Description
1
HEAD
2
GND
6
USB & RS 232 connector
7
12V DC IN
8
TPH connector
5
9
Paper sensor
Pin
Description
1
3.3V
2
BM_E
3
BM_R
4
3.3V
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