Carriage Position Service Check - Lexmark Jetprinter 4079-00 series Service Manual

4079-00X

Carriage Position Service Check

Symptom Explanation
You have an error code
indicating a carriage motor
or carriage linear encoder/
paper width sensor error.
The carriage should attempt to move when the machine is turned
on. If it does not, go to the
Check" on page
FRU
1 Carriage Lock
2 • Carriage
Drive Belt
• Idler Pulley
3 Print Timing Slit
4 • Brown Car-
riage Ribbon
Cables
• Carriage Lin-
ear Encoder/
Paper Width
Sensor
2-14
Conditions That Could Cause This
Symptom
• 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
"Carriage Motor Drive Data Service
2-13.
Action
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.
Be sure the carriage drive belt and the idler gear are
not damaged.
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.
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).