Brother LX-200 Service Manual page 171

11
No cutting in Y direction.
a. Defective Y-cutter (Y-G) switch.
b. Abnormal Y-cutter vertical movement.
Problem Check Item
a. Defective Y- Is the blue lead connector
cutter (Y-G) connected to CN8 on the
switch Main PCB?
Is leaf switch Y-G not
contacted when the Y-cutter
is at the standby position?
Does the Y-sensor lever
press the leaf switch when Y-
cutter is not at the standby
position?
Is main CPU port P46 (Pin
47) at High level when leaf
switch Y-G is open?
When leaf switch Y-G is
shorted, is CN8 on the Main
PCB shorted?
Is main CPU port P46 (Pin
47) at Low level when CN8
on the Main PCB is shorted?
When main CPU port P46
(Pin 47) is at Low level, is this
recognized by the main
CPU?
b. Abnormal Y- Does the Y-cutter cam rotate
cutter vertical when the trimming motor (TC
movement motor) rotates?
Does the Y-diversion lever
rotate when the Y-cutter cam
rotates?
Is Y-cutter assy mounted
correctly?
Cause
Leaf-switch assy not Correctly connect the
connected correctly. leaf-switch assy.
Leaf switch incorrectly Correctly install the
installed. leaf switch.
Y-sensor lever Correctly install the
incorrectly installed. Y-sensor lever.
Defective Y-sensor Replace the Y-sensor
lever. lever.
Continuity problem in Replace Main PCB
Main PCB. assy.
Defective pull-up Replace Main PCB
resistor R31. assy.
Defective leaf switch Replace leaf switch Y
assy. assy.
Continuity problem in Replace Main PCB
Main PCB. assy.
Defective series Replace Main PCB
resistor R27. assy.
Defective main CPU#1. Replace Main PCB
assy.
Problem with planet Apply KS64F silicon
gear operation. grease to the four
bearings.
Replace the TY
planet gear.
Y-extension springs Correctly install Y-
L/R incorrectly extension springs
installed. L/R.
Foreign matter under Clean out foreign
the Y-diversion lever matter.
Incorrectly mounted Y- Mount the Y-cutter
cutter assy. assy correctly.
7-19
Remedy Repair
Replace R31.
Replace R27.
Replace
CPU#1.
See
Section
3.3.3
3.3.4
3.3.5
3.3.1
3.3.3
3.3.4
3.3.5
3.4
3.3.1
3.3.3
3.3.4
3.3.5
3.4
3.6.1
3.7.1
3.8.1
3.8.2
3.10
3.3.3
3.3.4
3.3.5
3.5.1
3.3.1
3.3.3
3.3.4
3.3.5
3.4
3.3.3
3.3.4
3.3.5
3.5.1
3.3.1
3.3.3
3.3.4
3.3.5
3.4
3.15