Printer Self Repair

General Repair Information

This chapter describes the disassembly procedures to be used for replacing any of the main components of the FX-850/1 050.

Required and helpful tools, measuring instruments, and lubricants listed in Tables 4-1 through 4-3.

Table 4-1. Maintenance Tools

Description	Necessary	Convenient	Part No.
Philips screw driver #2	o		B7438GG2GG
Box driver (7 mm across)	o		B74 1700200
Thickness gauge (0.50 mm)	o		B7767GG3G1
Round nose pliers	o		B74G4GG1GG
Diagonal cutting nipper	o		B74GSGG 1GG
Tweezers	o		B64 1GGG1GG
E-ring holder #2.5	o		B74G9GG4GG
E-ring holder #3	o		B740800500
E-ring holder #4	o		B740800600
E-ring holder #5	o		B74G8GG7GG
Alcohol	o
Electric soldering iron		o	B74G2GG 1GG
Brush No. 1		G	B74 1400200
Brush No. 2		G	B74 1400100
Cleaning brush		o	B74 1600100

o: Commercially available product E: EPSON exclusive tool

Table 4-2. Measuring Instruments

Description	Specification	Necessary	Convenient
Multi meter		o
Oscilloscope	20 MHz or more	o
Logic analizer			o

Table 4-3. Lubricants and Adhesive

Description	Capacity	Availability	Part No.
o-2	4G cc	E	B7 1G2GGGG1
G-27	4G gr	E	B7G27GGGG1
Neji lock #2(G)	1GGG gr	E	B73G2GG2GG
Adhesive tape		o

O: Commercially available product E: EPSON exclusive product

Figure 4-1 shows some of the parts found on the FX-850/1050.

Paper Guide

Edge Guide

Paper Guide

Edge Guide

Figure 4-1 shows some of the parts found on the FX-850/1050.

Printer Cover

DIP Switches Platen Knob Paper Release Lever Control Panel

Paper Tension Unit Push Tractor

Power Switch

Figure 4-1. Parts of the FX-850/1050

There are several precautions you should take after performing troubleshooting and when packing the printer for transport:

Remove the ribbon cartridge and platen knob.

Figure 4-2. Ribbon Cartridge and Platen Knob Removal

2. Slide the printhead to the middle of the printer. Then, using a cross-head screwdriver, reattach the two transport locking brackets.

Figure 4-3. Transport Locking Brackets Installation

Attach the left and right locking tabs.

Figure 4-4. Locking Tabs Installation Slide the print head all the way to the left, and insert the print head protector as shown below.

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