Brother LX-300 Service Manual page 167

10
Lamination is not normal.
a. Defective ENC PCB assy.
b. Defective document or film.
Problem
a. Defective ENC Is the white lead connector
PCB assy. connected to CN15 on the
Main PCB?
Is the white lead harness
assy connected to the ENC
sensor assy?
Is the ENC sensor assy
correctly installed on the
cassette holder?
Conductivity in ENC
harness assy?
When the output from
output port P36 (Pin 79) of
the main CPU#3 is Low,
does the output from CN15
Pin 6 vary between 0 and
4V DC due to silver-black
targets?
b. Defective Is a cartridge mounted?
document or
Does film remain in the
film
cartridge?
Is silver-black foil stuck to
the edge of the film?
Check Item
Defective harness
assy connection.
Defective harness
assy connection.
Incorrectly installed
ENC sensor assy.
Defective ENC
harness assy.
Defective photosensor
in ENC sensor assy.
ENC sensor assy
incorrectly adjusted.
No cartridge mounted.
No film remaining.
Defective film.
Cause Remedy
Correctly connect
the harness assy.
Correctly connect
the harness assy.
Correctly install the
ENC sensor assy.
Replace the ENC
harness assy.
Replace ENC
sensor assy.
Replace ENC
sensor assy.
Mount a cartridge.
Replace the film.
Replace the film.
7-17
See
Repair
Section
3.3.3
3.3.4
3.3.1
3.3.3
3.3.4
3.3.5
3.4
3.6.1
3.7.1
3.7.3
3.8.1
Replace the
3.10
photosensor.
3.13
3.14
3.16
3.17
6.2