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Table
4-3.
Detailed Troubleshooting Chart
(cont'd)
TROUBLE
PROBABLE CAUSE
REMEDY
Prints too slow,
(cont'd)
Prints erratically
(missing dots)
Pin No.
7
prints too
light.
Line feed operates
improperly.
Defective printed circuit
board.
Defective head-carriage
assembly.
Defective mechanism assem-
bly.
Defective 7-wire head
ribbon cable assembly.
Defective 8049 micro-
processor
.
Defective printed circuit
board.
Defective FF head.
Defective head-carriage
assembly.
Defective platen assembly.
Printer requires general
cleaning and lubrication.
Line feed solenoid impro-
perly adjusted.
Defective line feed sole-
noid assembly.
Defective mechanism
assem-
bly.
Defective printed circuit
board.
Replace printed circuit
board.
(See
paragraph
6.3.)
Replace head-carriage
assembly.
(See
para-
graph
6.8.)
Replace mechanism assem-
bly.
(See
paragraph
6.2.)
Replace 7-wire head
ribbon cable assembly.
Replace 8049 micro-
processor
.
Replace printed circuit
board.
(See
paragraph
6.3.)
Replace FF head, 7-wire
flex circuit.
Replace head-carriage
assembly.
(See
paragraph
6.8.)
Replace platen assembly.
(See
paragraph
6.9.)
Clean and lubricate printer,
(See
paragraph
4.6.)
Adjust line feed solenoid.
(See
paragraph
5.6.)
Replace line feed solenoid.
(See
paragraph
6.4.)
Replace mechanism assem-
bly.
(See
paragraph
6.2.)
Replace printed circuit
board.
(See
paragraph
6.3.)
4-8
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