SAMSUNG DVD-S128, DVD-S124 Service Manual Troubleshooting

Samsung Electronics 3-1

3. Troubleshooting

No Disc recognition

LD is outputted

from object lens at

play key input?

No focus incoming and

no disc occurs.

Yes

No

B

A

No focus incoming

FE in SIC1-25

is within specified range?

SIC3-26, 27 output

are normal?

Check open state from

SIC3 to pick-up.

Check RIC1 and A, B, C, D input.

Check SIC3.

Yes

Yes

No

No

A

Troubleshooting

3-2 Samsung Electronics

No pick-up home positing

SIC1-34

output is normal?

Check the Sled Motor and connection

Check MIC1

Yes

No

SLED+, SLED-

SIC3-32, 33 output are

normal?

Check SIC3

Yes

No

NO LD CD ON

RIC1-19 is 5V?

Current exceeds 0.1A?

LD out pick-up replace.

Open check in related circuit.

Check MIC1

Yes

Yes

Yes

No

No

Divide RQ2 emitter terminal

voltage and 5V real voltage

difference into 10ohm.

B

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