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1. OUTLINE

This troubleshooting flowchart has been prepared for the repair of each board assembly of the

Microline 320/321 TURBO printer. The repairmen using this manual are assumed to be familiar

with certain techniques.

1.1 Items to Check Before Repair

• Check the inspection items specified in the instruction manual.

• Find out as many details of the trouble as possible from the customer.

• Inspect in the conditions as close as possible to those at the time the trouble occurred.

• Proceed with the repair as follows:

Check the trouble status according to Table 1.1 for the details of the trouble. Then, locate the

trouble position according to the detailed flowchart.

• Carry out a thorough test after the repair to check for correct functioning.

1.2 Troubleshooting

Table 1.1

Trouble contents Surmise of troublleStatus

Power is not supplied

No spacing operation

Homing does not end

normally

Paper jam while paper

insertion

Smearing/Missing dots

Faint or dark print

Ribbon feed trouble

Line feed trouble

Malfunction of switch on

operation panel.

Data receiving failure

Transformer, Power & Control Board, Driver Board, Operation Panel.

Space motor, carriage Cable, Print Head.

Space Motor, Carriage Cable, Spacing Mechanism, Driver Board

Pressure roller Mechanism, Support Protector, Pull up roller cover.

Print Head, Power & Control Board, Space Motor, Carriage Cable,

Driver Board

Print Head, Ribbon feed assembly, Power & Control Board, Driver

Board

Ribbon feed assembly, Space motor, Power & Control Board, Driver

Board

LF motor, Platen assy, LF mechanism, Power & Control Board, Driver

Board

Operation Panel, Power & Control Board, Driver Board

Power & Control Board, (I/F/P.C.B), I/F Cable, Menu setting, Driver

Board

Trouble upon

power on

Trouble

during

printing

Note: Refer to the Maintenance Manual for the troubleshooting flow chart of this table.

1 2 3 4 5 6 7 8 9 10 11 ... 102 103

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