Toshiba B-852-R manual Replacing the Main PC Board

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2. MAJOR UNIT REPLACEMENT

EO18-33018

2.3 Replacing the MAIN PC Board

2.3 Replacing the MAIN PC Board

1)Prior to replacing the MAIN PC board, print out the parameter settings for future reference.

2)Remove the side cover L from the printer. (Refer to Section 2.1.)

3)Remove the three SMW-3x6 screws to detach the rear frame cover.

SMW-3x6

Screw

Rear Frame Cover

4)Disconnect the harnesses from CN1, CN2, CN5, CN8, CN9 and CN500 on the MAIN PC board.

CN9 (Print Head Harness, Signal)

CN5 (Media Sensor Harness)

CN2 (Ribbon Motor Harness)

CN1 (Print Head Harness, Power)

MAIN PC Board	CN500 (Stepping Motor Harness)

2-3

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Contents Series Table of Contents Unpacking ProcedureChecks Opening and Removing the Covers Major Unit ReplacementLubrication Replacing the Main PC Board Remove the two SMW-4x8 screws, SMW-3x6 screw and B-3x6 screw Main PC Board 3x6 Screw Main PCB Support Frame SMW-3x6 Replacing the Panel PC Board Major Unit Replacement Replacing the Stepping Motor Pulley Motor Gear Stepping Motor Replacing the Head Up Sensor Replacing the Slit Sensor Rewind/Feed Replacing the Ribbon Motor Rewind/Feed Major Unit Replacement Replacing the Platen Platen Shaft Holder Feed Gap Sensor TR and Black Mark Sensor Upper Side Replacing the Media SensorFeed Gap Sensor LED and Black Mark Sensor Lower Side Pass the media sensor harness between the harness guides Replacing the Print Head Replacing the PS Unit and Reactor Disconnect the PSU harness from CN4 on the PS unit Inlet Periodic Maintenance Procedure Periodic Maintenance Procedure Replacement Periodic Maintenance Procedure Troubleshooting Toshiba TEC