Samsung DVD-P721M, Service Manual

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Troubleshooting
Samsung Electronics 3-3
No Search Operation
MIRR, SIC1-157
output is normal?
Actual velocity occurs
at SIC1-34 terminal?
Actual velocity occurs
at SIC3-32, 33 terminal?
Check RIC1 peripheral circuit.
RFAGCO, RIC1-72
output level is normal?
Check SIC1 peripheral circuit. Check SIC3 peripheral circuit.
No No No No
Yes
TE occurs in
search range?
Focus On?
Yes Yes Yes
A
See "Fine Seek Check"
No
Yes
Check pick-up.
No
FINE SEEK Check
FINE SEEK MIRR
signal (RIC1-65) is missing?
TZCO signal
(SIC1-24) is occurs?
Track incomming is
delayed?
TE is within
2V and 3V?
Pick-up transfer smooth.
Check RIC1 Peripheral curcuit.
Check SIC1 Peripheral curcuit.
Time out due to many jump counts.
Check SIC1 peripheral circuit.
SIC1-33 output
is normal? SIC3-28, 29
terminal outputs are
normal?
Check DCN1 and pick-up.
Check MECHA.
Check RIC1-26 terminal.
Check SIC3 peripheral circuit.
Yes Yes Yes
Yes Yes
Yes
Yes
No No No
No
No
No
No