Brother LX-200 Service Manual page 174

14
Cartridge size, film type cannot be detected correctly.
a. Defective cartridge type detector (CSIZE) switch.
Problem
a. Defective Is the yellow lead connector
cartridge type connected to CN12 on the
detector main PCB?
(CSIZE) switch
Is the cartridge leaf switch
pressed when an A4
cartridge is inserted?
Is the cartridge leaf switch
not pressed when an A6
cartridge is inserted?
Is main CPU port P62 (Pin
58) at High level when leaf
switch CSIZE is open?
When leaf switch CSIZE is
shorted, is CN12 on the Main
PCB shorted?
Is main CPU port P62 (Pin
58) at Low level when CN12
on the Main PCB is shorted?
When main CPU port P62
(Pin 58) is at Low level, is this
recognized by the main
CPU?
Check Item
Leaf switch C assy not
connected.
Incorrectly installed leaf
switch C assy.
Incorrectly inserted
cartridge?
Incorrectly installed leaf
switch C assy.
Continuity problem in
Main PCB.
Defective pull-up
resistor R77.
Defective leaf switch C
assy.
Continuity problem in
Main PCB.
Defective series
resistor R42.
Defective main CPU#1.
7-22
Cause Remedy
Correctly connect the
leaf switch C assy.
Correctly install the
leaf switch C assy.
Re-insert the
cartridge.
Correctly install the
leaf switch C assy.
Replace Main PCB
assy.
Replace Main PCB
assy.
Replace leaf switch
C assy.
Replace Main PCB
assy.
Replace Main PCB
assy.
Replace Main PCB
assy.
See
Repair
Section
3.3.3
3.3.4
3.3.5
3.3.1
3.3.3
3.3.4
3.3.5
3.4
6.2
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
Replace R77.
3.3.1
3.3.3
3.3.4
3.3.5
3.4
3.3.3
Replace R42. 3.3.4
3.3.5
3.5.1
Replace
CPU#1.