TSC TDM-20 User manual

i
SERVICE
MANUAL
TDM-20
Direct Thermal Portable Printer

ii
Contents
1. FUNDAMENTAL OF THE SYSTEM................................1
1.1 Overview..........................................................................................................1
2. ELECTRONICS ..............................................6
2.1 Summary of Board Connectors ......................................................................6
3. MECHANISM ................................................9
3.1 Replacing the Printer Top Cover (with Keys Control Board).........................9
3.2 Replacing the Linerless Platen Roller (Option)............................................10
3.3 Replacing the Platen Roller ..........................................................................11
3.4Replacing the Keys Control Board ...............................................................12
3.5 Replacing the Main Board Assembly............................................................13
3.6 Replacing the Print Mechanism....................................................................14
4. TROUBLESHOOTING ........................................15
4.1 Common Problems........................................................................................15
5. Maintenance ...............................................16
Revise History................................................17

1
1. FUNDAMENTAL OF THE SYSTEM
1.1 Overview
Front View
1. Power on/off button
2. Feed/stop button
3. LED indicators
4. Media cover
5. Media view window
6. Media cover release button
5
3
2
1
6
4

2
Interior View
1. Tear edge
2. Print head
3. Platen roller
4. Black mark sensor
3
2
4
1

3
Rear View
1. Li-ion Battery
2. Battery open clasp
3. Interface cover
4. Power jack
5. USB interface
1
3
2
5
4

4
LED Indication and Keys
1. Power on/off button
2. Feed/Pause button
3. Printer status LED indicator
4. Battery charge level LED indicators
5. Wireless status LED indicator
Keys
Function
1. Press and hold for 2-3 seconds to turn on the printer.
2. Press and hold for 2-3 seconds to turn off the printer.
1. Ready status: Feed one label
2. Printing status: Pause the print job
1
2
4
5
3

5
LED
Status
Indication
Printer status LED
indicator
Off
Printer is ready
Green (blinking)
Printer is paused
Green (blinking every two
seconds)
Sleep mode/ entered the
sleep mode after stop
working over 2 minutes
(The interval can be
changed by revising the
command, refer to
TSPL/TSPL2
programming manual on
TSC website).
Red (solid)
Media cover is open
Red (blinking)
Printer error
Amber (blinking)
Battery is charging.
Battery status LED
indicator
Green (blinking)
Battery is charging.
Green (solid)
Battery is charged.
Wireless/Bluetooth
status LED
indicator
Bluetooth/
Wi-Fi
Blue (blinking)
Bluetooth/ Wi-Fi device is
communicating.
Blue (solid)
Bluetooth/ Wi-Fi device is
ready.

6
2. ELECTRONICS
2.1 Summary of Board Connectors
Main board top
Connector
Description
1
12V DC IN
2
Micro USB Connector
3
LED Key Board Connector
4
Download F/W Connector

7
Pin
Description
1
3.3V
2
MCI0_DA0
3
MCI0_DA1
4
MCI0_DA2
5
MCI0_DA3
6
MCI0_CK
7
MCI0_CDA
8
No Connection
9
GND
5
TPH Connector
6
WiFi Module Connector
Pin
Description
1
RESET
2
3.3V
3
RTS
4
MISO
5
CTS
6
MOSI
7
CLK
8
Interrupt
9
WB GPIO
10
GND
7
Cradle Connector
Pin
Description
1
12V
2
Charge Status
3
ISET
4
GND
8
RTC Battery
Pin
Description
1
VDDBU
2
GND

8
Main board bottom
Connector
Description
1
Battery connector
Pin
Description
1
Negative (-)
2
NTC
3
Positive (+)