Brother LX-300 Service Manual page 158

3
An error occurred during processing after power ON (before film feed).
a. Abnormal +24V DC supply
b. Abnormal DC input voltage.
c. Abnormal X-cutter power ON processing.
d. Abnormal Y-carriage power ON processing.
e. Abnormal Y-cutter power ON processing.
Problem
a. Abnormal Is +24V DC voltage at ±0V?
+24V DC
supply
Does +24V DC voltage
exceed 24 V at the same
level as the AC adaptor
output voltage (at rated AC
input)?
Is power supply IC#1 (Pin 7)
switching?
Is transistor Q1 collector
voltage switching between
0 V and input voltage?
Is transistor Q5 collector
voltage switching between
+24 V and 0 V?
b. Abnormal DC Is input voltage from AC
input voltage adaptor between 16 V and
23 V (at rated input)?
Is main CPU port P60 (Pin
30) between 2.0 V and 2.9
V (using rated AC input)?
c. Abnormal X- X-cutter does not move at
cutter power all?
ON processing
Error occurs during X-cutter
position detection?
Check Item
Coil L2 discharged.
Conductivity problem
with diode D4.
Defective AC adaptor.
Defective power
supply IC#1.
Defective transistor
Q1.
Defective transistor
Q2.
Defective transistor
Q5.
Defective AC adaptor.
Defective resistors
R25 and R50.
Foreign matter stuck
in cutter.
Defective X-cutter.
See
Cause Remedy
Replace Main PCB
assy.
Replace Main PCB
assy.
Replace AC
adaptor.
Replace Main PCB
assy.
Replace Main PCB
assy.
Replace Main PCB
assy.
Replace Main PCB
assy.
Replace AC
adaptor.
Replace Main PCB
assy.
Clean out foreign
matter.
Replace the X-cutter
assy.
Abnormal X-cutter operation.
7
7-8
See
Repair
Section
Replace L2.
3.3.3
3.3.4
3.3.5
Replace D4.
3.4.2
3.5.1
−−−
Replace
IC#1.
Replace Q1.
3.3.3
3.3.4
3.3.5
Replace Q2. 3.4.2
3.5.1
Replace Q5.
−−−
Replace 3.3.3
resistors R25 3.3.4
and R50. 3.3.5
3.4.2
3.5.1
−−−
3.3.1
3.3.3
3.3.4
3.3.5
3.4
3.6.1