Text preview for : TROUBLESHOOTING.pdf part of Samsung SF-3100 Samsung SF-3100 Service Manual



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4-2. Troubleshooting
4-2-1. Overall Troubleshooting Flow

START

Plug the power cord

Power Supply OK?
N

Y

System initialized?
N

Y

RTC OK
N

Y

See 4-2-2

See 4-2-3

See 4-2-12

Load document in Feeder

Document fed?
N

Y

Press START Key

CIS on?
N

Y

See 4-2-4

See 4-2-5

Y

Copy OK?
N

Call machine from another phone

Auto Answer OK ?
N

Y

Y

RX OK?
N

See 4-2-6

See 4-2-7

See 4-2-8

RX OK ?
N

Y

Lift Handset off hook

Y

Y

Dial tone OK ?
N

TX OK ?
N

See 4-2-9

See 4-2-10

See 4-2-11

END

4-8

Samsung Electronics

Troubleshooting

4-2-2. Check Power Supply

START

Power cord connected?

Y

Check AC socketvoltage

220 ~ 240 VAC?

Y

N
Connect as required END

N
Notify customer

Check Power Cord Continuity

Y

Fuse OK?

Y

Q1 OK ?

Y
R4 Short ?

Y

N

N

N

N
END

Replace Cord

Replace Fuse

Replace Q1

Remove short

Samsung Electronics

4-9

Troubleshooting

. No +5 V

START

Output Shorted ?

N

D6 Open or Shorted ?

N

Check U2 Input voltage

Y
Remove short

Y
Replace D6

DC 6 V

Y

Check U2 ?

Y

Check CON1-1

END

N

N

Check PCB Pattern

Replace U2

. No -5 V

START

output shorted ?

N

D7 Open or Shorted ?

N

Check U3 Input voltage

Y
Remove short

Y
Replace D7

-6 VDC

Y

U3 Output ?

Y

Check CON1-5

END

N

N

Check PCB Pattern

Replace U3

4-10

Samsung Electronics

Troubleshooting

. No +24 V

START

output shorted ?

N

D5 Open or Shorted ?

N

Check D5 Output voltage

Y
Remove short

Y
Replace D5

DC 24V

Y

Check ZD4 ?

Y

Check CON1-3

END

N

N

Check PCB Pattern

Replace ZD4

Samsung Electronics

4-11

Troubleshooting

4-2-3. System Not Initialized
START

Check Vcc 4.75V P1-1 (+5) P1-2 (GND5)

Y

Check U11Pin 3 = "High"

N

Replace U11 Voltage detector IC

N

Y

See Section 7-2-2

Step motor driving

Y

Check P2 Harness or OPE PBA

OK NG

Replace P2 Harness or OPE PBA

N

NG OK
Replace U1 KS32C65100 IC Check 38.00053 MHz Clock U5 Pin68

NG
Check 20 MHz Clock U1-188

NG
Replace X3 XTAL

NG

Check 9.5 MHz Clock U14 Pin184

Y
Replace U3 Flash Memory

OK

OK ?

Y

END

N
Replace U1 KS32C65100 IC

OK ?

Y

END

N
A

4-12

Samsung Electronics

Troubleshooting

A

Replace MAIN PBA

END

Samsung Electronics

4-13

Troubleshooting

4-2-4. Document Not Loading

START

Insert Document

OPE "H" ? U4-3

Y

Check 24V P4-5,6 ?

Y

N
Replace D-DET SENSOR

N
See Section 4-2-2

P4-1,2,3,4 Motor Strobe

OK

Replace Motor N

NG

U10-4,5,6,7 Motor Strobe

OK
Replace U10

NG

Replace U1

END

4-14

Samsung Electronics

Troubleshooting

4-2-5. CIS LED Not Lit

START

Load document in feeder

Document fed ?

Y

Press the copy button

N

See 4-2-4

CIS LED lights

Works properly ?

N

Check +5V,24V from LIU P3-3,P3-7

Y

N
Normal? Check +5V,+24V from MAIN P2-5 P2-1

Y

N

Replace the power supply

Check CIS CLK from LIU P3-5

Replace CIS

Y

500KHz ?

N

Replace the main b'd

END

Samsung Electronics

4-15

Troubleshooting

4-2-6. Malfunction on Copy
START Load document in feeder Document fed ? N See chart 4-2-4 Y Press the COPY button

CIS LED on ? N

Y

Copy works properly ? Y

N

0V Check CIS clock (P3-5) the LIU board

5V

See chart 4-15

A

Normal ? N

Y

Replace CIS

Check cartridge

Good ? N

Y

Replace the main b'd

Replace cartridge N Check U1, U2 in the CR board Y +5V and +24v ? N Check harness Replace the main b'd N Good ? END Y Replace the power supply Replace harness A Measure voltage on the main board N Copy produced ? Y

Good ? Y

4-16

Samsung Electronics

Troubleshooting

A

Good copy quality ?

N

Run the selt test

Good printer quality ?

N

Replace the CR b'd

Y

Y

Run the CIS test

Normal ?

Y

N
Good copy quality ?

Replace the CIS

N

Replace N the main b'd

Y

END

Samsung Electronics

4-17

Troubleshooting

4-2-7. Malfunction in Auto Answer

START

Call the machine from another phone

Auto answer?

Y

N

Check Signal P2-18 in MAIN board

+5V 0V

? N

Y

Replace main board

Replace LIU board

END

4-18

Samsung Electronics

Troubleshooting

4-2-8. Malfunction in Manual Receiving

START

Lift the handset from fax then press START

Machine goes on-line ?

Y

N

Check P2-22 in MAIN board

5V

Y
0V ?

Check P2-16 in MAIN board

N N
0V ?

5V

Replace LIU board

Y

Replace main board

Replace main board

END

Samsung Electronics

4-19

Troubleshooting

4-2-9. Malfunction in Automatic Receiving

START

Call the machine from another phone

Auto answer ?

Y

Receive data ?

N

N
See chart 4-2-7

Y
END

Check the telephone line

Y
Normal ?

Check Tx/Rx signal from P2-17 to P2-15 in the main b'd

N

Notify to customer

Normal ?

N

Replace the LIU b'd

Y

Replace the main b'd

END

4-20

Samsung Electronics

Troubleshooting

4-2-10. No Dial Tone

START

Press OHD/V.REQ.

Test Telephone Cord

Y

NG

Replace Telephone Cord

OK

Dial tone ?

NG

Use a phone to check service at wall jack

OK

N
Lift Handset Service OK ?

Request Telephone Service

Y

Dial tone ?

OK
Main PCB P2-22 CML1 Signal

L

NG

H
Check/ Replace: Handset cord Handset, Hook Switch, LIU U1, LIU Board

Check/ Replace: Speaker Main Board U9

Main PCB U7-9 SPK_CTRL Signal

H

L

Return machine to Custmer

Replace Main PBA

Samsung Electronics

4-21

Troubleshooting

4-2-11. Transmit Failure

START

Load document

Dial Receiving Machine

Feed OK ?

Y

Transmit Begin ?

Y

N

N

Chart 4-2-4 Document Not Loading

Replace: LIU board, Main Board

Return Machine to Customer

4-22

Samsung Electronics

Troubleshooting

4-2-12. RTC FAILURE

START

CHECK TIME ON LCD=NG

CHECK BT1 ON MAIN BOARD

Y
3V?

N
CHECK U1-202 ON MAIN BOARD REPLACE BT1

Y
3V?

Y

32.768KHZ?

N
REPLACE MAIN BOARD

N

REPLACE X2 X-TAL

Notice : Remove the Lithium battery from main board, Dispose of main board properly, Lithum battery must be recycled.

Samsung Electronics

4-23

Troubleshooting

MEMO

4-24

Samsung Electronics