Panasonic UF-5500 Service Manual page 134

UF-5500 / 4500
11.2.3.5. INFO CODE=051
"INFO CODE=051" means that Engine DC motor's rotation detection signal (LD) does not become Low.
After the LCD indicates "INFO CODE=051", turn the power OFF/ON.
Yes
Replace IC300.
Check the solder
Yes
at R512, R515,
and C510.
Check the
Yes
connection
of harness
INFO CODE=051
No
Does the DC
motor rotate?
Yes
Is the pulse input into
R515 (IC300 side)?
No
Is the pulse input into
CN502-5pin?
No
Is the pulse output
from DC motor?
No
Replace DC motor.
Is 24V output from
CN502-1/2pin?
Yes
Is the signal from
CN502-6/7/8pin output?
(Refer to DC MOTOR
wave form)
No
Is the signal from
IC300-A12/B12/C12pin output?
(Refer to DC MOTOR
wave form)
Yes
Check the solder at
Q502, Q525, Q526.
134
No
Check the solder
at
L502.
Yes
Replace DC motor.
No
Replace IC300.