Samsung DVD-905, DVD_878KV Troubleshooting

Samsung Electronics 5-1

5. Thoubleshooting

Replace PQ1(FET)

No power

PF01

Error?

PD01

voltage is miss-

ing?

PQ(FET) D-S

voltage is miss-

ing?

6pin voltage

exists in PIC1?

Pulse is missing

in PIC1 5?

No

Yes

No

Yes

Replace fuse

Check PR10

Check 2d voltage

Check PR11, 12, 13, 14

Replace PIC

Check feed back.

Thoubleshooting

5-2 Samsung Electronics

Yes

No

intermittent operation

Transformer secondary is

Open

After other output line is shorted,

check for intermittent operation.

Check voltage-line short for

intermittent operation

Check PR11, 12, 13, 14 voltage

Check PC14, 15

Pattern check. PL36, PL37 Open check. PR21, 22, 23

PZD11, Open check

Short 5.8V line.

Intermittently works?

PIC2

Output voltage is miss-

ing?

PIC1 6

Output 10V error?

No PIC1 5 output?

PIC 8

Output 7V error?

Thoubleshooting

Samsung Electronics 5-3

Yes

No

Yes

No power

Check intermittent

operation mode

Front Micom FU1 of

ON/OFF

signal is missing?

PIC4, 6, 7

output is missing?

Each output port open

PIC4, 6, 7 input is OK?

Replace the corre-

sponding IC.

Thoubleshooting

5-4 Samsung Electronics

No Front (SET) operation

REF+/-, +5V, -28V power

is supplied to FJP1?

Check power status

Check FXTAL peripheral circuit

Check reset peripheral circuit of FIC2

Check FIC1(Micom) soldering

Check FU1(Micom) peripheral circuit

Check S/W interface. Check

communication status with main Micom

Check FR pins 34,13,12,11,10,8

7,6,26

If the problem persists:

Check after replacing Front.

Check other parts for normal Front operation

12MHz oscillation (FY1)?

Reset working in

FIC1(Micom) 12pin?

FIC1(Micom)

soldering is OK?

Operational waveform is

missing

in FIC3(FLT) pin ?

Keys of STOP, PLAY, OPEN

work normally?

No

Yes

Thoubleshooting

Samsung Electronics 5-5

No Search operation

FG is input

uCOM from SIC2

19 terminal?

Reference velocity

signal occurs at SIC2 16

terminal?

Actual velocity occurs

at SIC2 18 terminal?

SLEDGS terminal

is ÔLÕ (in search range)?

Replace uCOM program

Check SIC2 peripheral circuit

1.5Vpp sine

wave occurs at search at

SIC2 3, 21 terminal?

Replace Hall PCB

Check SIC2 peripheral circuit

Check SLEDGS terminal of

uCOM. Check peripheral circuit.

A

(Page5-6)

No

Yes

No

Thoubleshooting

5-6 Samsung Electronics

No

Yes

No

Yes

TE occurs in

search range?

Focus On?

C

A

After SLEDGS

terminal is changed from

ÔLÕ to ÔHÕ, track input is

OK(within several ms)?

FINE SEEK RFRF

signal is missing?

RFCT follows

center level of RFRF?

Track incoming is

delayed?

C

(Page 5-

11)

FINE SEEK check

Check RIC1 peripheral circuit

Check PR11 peripheral circuit

Time Out due to many

jump counts

Check SIC2 peripheral

soldering

Yes

No

Thoubleshooting

Samsung Electronics 5-7

No

Yes

B

TE is within 2V

and 3V?

SIC7 49 output

is normal?

SIC4 11, 12

terminal outputs are

normal?

Check CN1

and Pick-up

For CD, check RR34,

RR36A peripheral circuit

For DVD, check RR45

peripheral circuit

Check SIC4

peripheral circuit

SLED linked loop check

SIC7 53 FMC

occurs?

SIC4 14 ouput is

normal?

SIC4 17,

18 terminal outputs are

normal?

Pick-up transfer is smooth.

Check SIC4 soldering and

power

Check SQ1 peripheral circuit

and SLEDGS terminal

Check SIC7 53

peripheral circuit

SLEDGS

terminal is ÔLÕ?

Yes

Thoubleshooting

5-8 Samsung Electronics

No

Yes

Abnormal rotation

of disc motor

RIC3 Pin 6

output is normal?

RIC1 Pin 42

(for CD) or 43(for DVD)

output are normal?

Check path to SIC7

and DIC1

Check SIC6

soldering and power

Check SIC5 soldering and

power or Replace SIC5

Check RIC1

soldering and power

Check RIC3 peripheral

circuit and A, B, C, D

Input of RF

signal is normal?

For CD, SIC7 38 terminal.

For DVD, DIC1 Pin 50

DMO

output is normal?

For CD, SIC7 55 terminal.

For DVD. DIC1 Pin 54

SIC6 Pin 1

output is normal?

SIC5 Pin22

signal is normal?

Check or replace disc motor

After resoldering

SIC7, DIC1,

unchanged,

replace IC.