Lexmark Jetprinter 4079-00 series, Service Manual

Page: 32 / 183

2-14
4079-00X
Carriage Position Service Check
The carriage should attempt to move when the machine is turned
on. If it does not, go to the
“Carriage Motor Drive Data Service
Check” on page 2-13 .
Symptom Explanation
Conditions That Could Cause This
Symptom
You have an error code
indicating a carriage motor
or carriage linear encoder/
paper width sensor error. • Carriage lock
• Carriage drive path obstructed
• Carriage belt or idler
• Carriage motor
• Print timing slit
• Brown carriage ribbon cables
• Linear Encoder/Paper Width Sensor
• Logic board
FRU Action
1 Carriage Lock The carriage lock is used to hold the carriage in a
locked position during shipping or to prevent unau-
thorized use. Be sure the lock is in the unlocked
position. Replace it if it is damaged.
2 • Carriage
Drive Belt
• Idler Pulley
Be sure the carriage drive belt and the idler gear are
not damaged.
3 Print Timing Slit The print timing slit has coded carriage escapement
identification on it. If the characters are not printed in
their correct positions, the timing slit may be dam-
aged and must be replaced. Check for dirt, damage,
or folds.
4 • Brown Car-
riage Ribbon
Cables
• Carriage Lin-
ear Encoder/
Paper Width
Sensor
The carriage linear encoder checks the position of
the carriage by reading timing data on the timing slit.
If the linear encoder is failing, the carriage loses
position and an error codes is displayed.
Check the brown carriage ribbon cables for continu-
ity. If the continuity is incorrect, replace the carriage
linear encoder (Asm 9-2).