Epson 680Pro - LQ B/W Dot-matrix Printer Service Manual page 76

EPSON Stylus COLOR 680/777/777i
4. Holding the Left housing lightly, pull down the Circuit board unit. Then
disconnect the following four cables from the corresponding connectors on the
Main board.
n CR motor connector cable : CN12
n PF motor connector cable : CN7
n Printhead FFC
n HP/PE sensor cable
5. Remove the following screws securing each circuit board to the Shield plate.
Figure Figure 4-17.
n C383 MAIN
C.B.S 3x6 F/Zn (Red circled screws)
C.P. 3x6 F/Zn (Yellow circled screws)
n C383PSB/E
C.B.S 3x6 F/Zn (Yellow circled screws)
C.B.S-TITE R 3x6 F/UC (Red circled screw)
C.B.(O) 4x5 F/ZG for 120V (Green circled screw) :1pcs (for Earth terminal)
Hexagon nut, Normal M4(Green circled)
(C.B.S 3x6 F/Zn for 220V (Green circled screw) : 1pcs (for Earth terminal))
Disassembly and Assembly
: CN8, CN9
: CN4
: Remove five screws.
: 3pcs (for Main board)
: 2pcs (for Parallel I/F)
connector)
: Remove five screws.
: 3pcs (for PS board)
: 1pcs (for PS board)
: 1pcs (for Earth terminal)
NOTE: 110V type of the PS board dose not have earth wire.
C383 MAIN Board
Figure 4-17. Remove the screw securing each circuit board
When replacing the Main board with a new one, perform the
following service items.
n Before removing the Main board, connect the parallel I/F or
USB Cable and try to read out the following data by using the
Adjustment program. If this operation succeeds, replace the
Main board and write the read out data to the new Main board
through the Adjustment program.
1) I/C Ink consumption counter.
2) Waste ink drain pad counter.
3) Printhead ID input.
4) Gap adjustment (Bi-d adjustment)
In case the above mentioned data are not able to be read out from
the defective Main board, perform the following service items.
n Replace the both ink cartridges with a brand new one.
n Replace the Waste ink drain pad with a new one.
n Input the Printhead ID.
n Adjust the Bi-d alignment.
Disassembly
Revision B
C383 PSE/PSE board
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