Toshiba Bsx4t Manual

8. PERIODIC MAINTENANCE PROCEDURE EO18-33012A 
8. PERIODIC MAINTENANCE PROCEDURE 
 
8- 4 10. Conduct the following tests and make sure that there is no problem. 
(1) Print test with TOSHIBA TEC-approved media and ribbon.  (Print tone, print head position, 
etc.) 
(2) Paper skew 
 When the Strip Module is used; 
 If the label skews when using the built-in Rewinder unit, turn the adjustment knob of the 
rewinder guide plate to correct the label feed.  Clockwise turn moves the rewinder guide plate 
forward...

9. TROUBLESHOOTING EO18-33012A 
9. TROUBLESHOOTING 
 
9- 1 9. TROUBLESHOOTING 
Problems Cause Solution Power does not 
turn ON. 1. Input voltage to the printer is not 
within the rated voltage. (Check by 
CN1 on the PS unit.) 
2. Output voltage from the printer is 
not within the rated voltage.  [Check 
that the voltage between +24V pins 
(1, 2 and 6) and PG pins (3, 7 and 
8) of CN4 on the PS unit is 24V.  
And check that the voltage between 
+5V pin (5) and SG pin (4) is 5V.] 
3. No voltage to the MAIN...

9. TROUBLESHOOTING EO18-33012A 
9. TROUBLESHOOTING 
 
9- 2 Problems Cause Solution Ribbon wrinkle 1. Poor ribbon quality. 
 
2. Ribbon is not rewound or fed 
smoothly. Use only TOSHIBA TEC-approved 
ribbon.  
Replace the ribbon rewind motor or 
ribbon feed motor.  Media feed failure 1. Media is not set properly. 
2. Poor media quality 
 
3. Improper adjustment of the feed gap 
sensor or black mark sensor. 
4. Threshold is improper.  
5. Failure of the feed gap sensor or 
black mark sensor 
6. The cutter...

10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.1 POWER SUPPLY UNIT 
 
10- 1 10. MAJOR UNIT REPLACEMENT 
 
 
 
NOTE: Be sure to disconnect all cables of the printer from the PC and the option devices. 
Never remove the screws fixing the printer block. (See Caution in Section 3.) 
 
10.1 POWER SUPPLY UNIT 
1) Remove the side panel (L). (Refer to Section 3.2.) 
2) Disconnect the power supply harness from CN19 on the Main PC board. 
3) Remove the SMW-3x6 and the two SMW-4x6 screws to detach the power supply unit...

10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.1 POWER SUPPLY UNIT 
 
10- 2 4) Disconnect the power harness from the power supply unit.  
5) Replace the power supply unit with a new one, then reassemble in the reverse order of removal. 
 
 
 Power Supply Unit  Power Harness  

10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.2 MAIN PC BOARD
 
 
10- 3
 
10.2  MAIN PC BOARD 
1)  Remove the side panel (L). (Refer to Section 3.2.) 
2)  For the B-SX5T series, remove the expansion I/O board. (Refer to Section 4.) 
3)  Disconnect all the cables from the MAIN PC board. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
NOTE:  The cables are connected to the following connectors as standard (without option). 
B-SX4T: CN8, 9, 12, 13, 16, 17, 19, 23, 50 – 53 
B-SX5T: CN3, 4, 8, 9, 11 – 13,...

10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.2 MAIN PC BOARD 
 
10- 4 4) Remove the four SMW-3x6 screws to detach the Main PC board from the printer. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5) Replace the Main PC board with a new one, then reassemble in the reverse order of removal. 
 
 
 
 
 SMW-3x6 Screw 
Main PC Board    Main PC Board   

10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.3 PANEL PC BOARD AND LCD UNIT 
 
10- 5 10.3 PANEL PC BOARD AND LCD UNIT 
 10.3.1 LCD 
1) Remove the side panel (L). (Refer to Section 3.2.) 
2) Remove the operation panel ass’y. (Refer to Section 3.4.) 
3) Remove the two LCD harnesses, the four TT-2x6 screws, and the two TT-3x8 screws from 
the LCD. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4) Detach the LCD from the operation panel ass’y. 
 
 
 
 
 
 
 
 
5) Replace the LCD with a new one, then reassemble in the reverse...

10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.3 PANEL PC BOARD AND LCD UNIT 
 
10- 6  10.3.2 Panel PC Board 
1) Remove the side panel (L). (Refer to Section 3.2.) 
2) Remove the operation panel ass’y. (Refer to Section 3.4.) 
3) Remove the two LCD harnesses and the six TT-3x8 screws from the LCD. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4) Detach the panel PC board from the operation panel ass’y. 
 
 
 
 
 
 
 
 
5) Disconnect the LCD harness from the panel PC board. 
 
 
 
 
 
 
 
 
 
 
 
6) Replace the panel PC...

10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.4 STEPPING MOTOR 
 
10- 7 10.4 STEPPING MOTOR 
1) Remove the side panel (L). (Refer to Section 3.2.) 
2) Disconnect the stepping motor harness from CN16 on the Main PC board. 
3) Remove the stepping motor harness from the cable clamp and the bush. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4) Remove the two SMW-4x8 screws from the stepping motor.  And then detach the stepping motor 
from the printer while taking the two timing belts off the pulley. 
 
 CN16...