Toshiba Bsx4t Manual

							10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.7 PRINT HEAD 
 
10-18 3) Remove the two SMW-3x8 screws to detach the print head ass’y from the head bracket. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4) Open the printer block. (Refer to Section 3.3.) 
 NOTE: At this time, be sure to support the bottom of the print head so as not to drop onto the 
platen.  Failure to do this may cause the print head and the platen to be damaged. 
5) Pull the print head ass’y in the direction indicated by the arrow.  And then disconnect the two 
harnesses to detach the print head ass’y. 
 
 
Print Head Ass’y Print Head Harness  Printer Block   SMW-3x8 Screw 
Print Head Ass’y  Head Bracket   SMW-3x8 Screw  
						

							10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.7 PRINT HEAD 
 
10-19 6) Replace the print head ass’y with a new one, then reassemble in the reverse order of removal. 
 NOTE: Fit the positioning pins of the head bracket into the positioning holes of the print head 
ass’y, which doesn’t require the position adjustment. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
7) Make sure that the print head harness doesn’t appear out of the printer block.  If so, the print head 
harness may touch the ribbon and the media causing a print failure. 
 
 
 
 
 
 
 
 
 
 
 
 
 
8) Perform a test print.  Make sure that printing was performed correctly. 
 If the print tone is improper, refer to Section 5.5.5 to adjust the print tone.  
9) Refer to Section 5.8.3 to perform a maintenance counter clear.   Positioning Pin Head Bracket 
Positioning Hole Print Head Ass’y 
Positioning Pin 
Positioning Hole    Print Head Harness Printer Block   
						

							10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.8 PLATEN 
 
10-20 10.8 PLATEN 
1) Open the top cover. (Refer to Section 3.1.) 
2) Open the printer block. (Refer to Section 3.3.) 
3) Push the hook through the rectangle hole with a fine tool to remove the platen holder cover. 
 
 
 
 
 
 
 
 
 
 
 
4) Remove the platen holder and the strip plate. 
 
 
 
 
 
 
 
 
 
 
 
5) Pull the platen ass’y to the right until the entire pulley appears. 
6) Pull the pulley forward. 
7) Pull the platen to the left to detach it from the printer. 
 
 Platen Holder Cover Hook   Push Platen Holder  Strip Plate   Platen Pulley 6) 7) 5)  
						

							10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.8 PLATEN 
 
10-21 8) Replace the platen with a new one, then reassemble in the reverse order of removal. 
 NOTES:  
 1. Apply FLOIL to the platen pulley before installing the platen.  
 
 
 
 
 
 
 
 
  
 
  
 
 2. When installing the platen, first fully insert the pulley into the printer.  Also make sure that the 
platen holder cover is fixed with the hook. 
 
 
 
Platen   Platen  Pulley  
						

							10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.9 FEED ROLLER 
 
10-22 10.9 FEED ROLLER 
1) Open the top cover. (Refer to Section 3.1.) 
2) Open the printer block. (Refer to Section 3.3.) 
3) Make sure that the media guide is closed.  (In this condition, you can easily remove the feed roller 
holder cover on the left side of the feed roller.) 
 
 
 
 
 
 
 
 
 
 
 
 
4) Push the hooks through the rectangle holes with a fine tool to open the feed roller holder covers. 
 
 
 Media Guide   Feed Roller Holder Cover  Feed Roller Holder Cover Left Side Right Side  Feed Roller   Push Hook Push Hook  
						

							10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.9 FEED ROLLER 
 
10-23  NOTE: If the left feed roller holder cover is hard to open, remove the side panel (L) and open  
 the feed roller holder cover from the opposite side of the printer as shown in the pictures 
 below. 
 
 
 
 
 
 
 
 
 
 
 
 
5) Detach the feed roller holder and the feed roller. 
 
 
 
 
 
 
 
 
 
 
6) Replace the feed roller with a new one, then reassemble in the reverse order of removal. 
 NOTES:  
 1. Apply FLOIL to the feed roller gear before installing the feed roller. 
 
 
 
 
 
 
 
 
 
 2. When reassembling, make sure that the feed roller is attached correctly.  Also make sure that 
the feed roller holder covers are fixed with the hooks, respectively. 
 
 
 Feed Roller Holder Cover  Feed Roller   Feed Roller Holder Feed Roller   Feed Roller Holder Cover Feed Roller Gear Feed Roller  
						

							10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.10 PINCH ROLLER ASS’Y 
 
10-24   10.10 PINCH ROLLER ASS’Y 
1) Open the top cover. (Refer to Section 3.1.) 
2) Open the printer block. (Refer to Section 3.3.) 
3) Remove the two SMW-3x6 screws to remove the pinch roller side plate. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4) Detach the pinch roller ass’y from the pinch roller block. 
 
 
Pinch Roller Ass’y  Pinch Roller Block   Pinch Roller Side Plate  SMW-3x6 Screw  
						

							10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.10 PINCH ROLLER ASS’Y 
 
10-25 5) Replace the pinch roller ass’y with a new one, then reassemble in the reverse order of removal.  
At this time, take care of the following points. 
· Tighten the two SMW-3x6 screws with 58.8 to 88.2N cm torque. 
· When reassembling the pinch roller ass’y, make sure that the cam is located as the picture 
below shows. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
· When reassembling the pinch roller ass’y, insert the pinch roller arm into the space below the flat 
spring. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
· Fit the shaft into the opening of the pinch roller block. 
 
 CamPinch Roller Shaft 
Pinch Roller Arm  Flat Spring 
Pinch Roller Ass’y Flat Spring Pinch Roller Arm   Pinch Roller Ass’y Shaft Opening    
						

							10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.11 MEDIA SENSORS (UPPER, LOWER) 
 
10- 26 10.11 MEDIA SENSORS (UPPER, LOWER) 
NOTE: The media sensor ass’y is composed of the media sensor (upper) and the media sensor 
(lower).  The media sensor (upper) contains the thermistor and the feed gap sensor (photo 
transistor).  The media sensor (lower) contains the black mark sensor and the feed gap 
sensor (photo diode). 
 
 10.11.1 Removing the Media Sensor Ass’y 
1) Open the top cover. (Refer to Section 3.1.) 
2) Open the side panel (L). (Refer to Section 3.2.) 
3) Remove the two TT-3x5 screws from the media sensor (upper) 
4) Remove the E-3 e-ring. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5) Open the printer block. (Refer to Section 3.2.) 
6) Pull the media sensor ass’y and the media sensor shaft to the direction indicated by the arrow.  
And then, remove the sensor guide from the printer frame. 
 TT-3x5 Screw 
Media Sensor (Upper) Pinch Roller Block 
E-3 E-ring   Media Sensor Ass’y Media Sensor Shaft 
Sensor Guide    
						

							10. MAJOR UNIT REPLACEMENT EO18-33012A 
10.11 MEDIA SENSORS (UPPER, LOWER) 
 
10- 27 7) Disconnect the black harness from the media sensor (upper) and the white harness from the 
 media sensor (lower), respectively. 
 NOTE: The other end of the sensor harness is connected to CN51 on the Main PC board. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
8) Remove the sensor guide from the media sensor ass’y while moving it to the direction 
indicated by the arrow. 
 
 Sensor Harness Media Sensor (Upper) 
Media Sensor (Lower) 
Sensor Guide  Media Sensor Ass’y  Sensor Guide Media Sensor Ass’y   Sensor Guide