Commodore 1515 Technical Manual page 41

4. The carrier unit overruns
START
Wrong position or
bad contact between
Clean or
connector and LED or
reset them.
PH wire of dot sense?
NO
Voltage on LED wire
of home sense zero?
NO
Dot sensor unit
setting abnormal?
No output of
dot sense?
Wrong position or
bad contact between
connector and LED
or PH wire of home
sense.
NO
Voltage on LED wire
of dqt sense zero?
No output
of home sense?
YES
Repair CB unit
YES
Repair PCB
unit.
YES
Adjust it.
NO
> - - - - - Replace dot
sensor unit.
YES
)--- Clean or
reset them.
YES
>---Repair
PCB unit.
NO
Replace
)-------- home sensor
unit.
5. Improper paper
feed
movement
39
START
YES
Reset or clean
passage of it.
YES
Replace claw
Manually feeding
paper by depressing
LF solenoid too
heavy?
NO
LF rope spring
abnormal?
Function of reverse
stop claw defective?
NO
Wrong position or
bad contact between
connector and lead
wire of LF solenoid?
wheel unit.
Replace
YES tractor shaft
or lubricate
its bearing.
YES
Reset or
replace it
YES
Adjust it.
>----Adjust it.
YES
YES
Replace it
or reverse
stop spring
Clean or
reset it.
Replace it.