Page 1
Y
Y
Y
Y
Y
YY
Y
N
N
NN
YYY
NNNN
N
N
6. Troubleshooting
6-1. Overall Troubleshooting Flow
SF700AT 6-1
Turn on power
Load document in
feeder
Copy OK ? OGM Recording OGM play back ?
Call machine from
another phone
ICM Recoding ? Auto Answer ?
Manual
operation ?
RX OK ?
Document fed ? Push 'START' Key CIS ON ?
LCD Display ?
See 6-2 See 6-3
See 6-5See 6-4
See 6-6
See 6-8 See 6-9
See 6-7
See 6-10 See 6-11
A
System
initialized ?
Start
Page 2
Troubleshooting
6-2 SF700AT
Y
Y
Y
N N
N
Hook off using
handset
Speakerphone
operating ?
Dial tone OK ? TX OK ?
Speaker
phone call
See 6-12
See 6-14
End
See 6-13
A
Page 3
Y
Y
Y
Y
Y
N
N
N
N
Y
Y
Y
N
N
N
N
N
Troubleshooting
SF700AT 6-3
Logic 'H' ?
Check AC voltage
power cord
Voltage O.K
Check power
supply voltage
Replace power
supply
Fuse remain
good ?
1. Replace Fuse
2. Plug in machine
1. Unplug machine
2. Check fuse
Fuse OK ?
Measure on the
CONN board
+5 V ?
+5 V ?
Check harness OK ?
Replace OPE board
and LCD module
Replace harness
Measure on the
OPE board
OK ?
A
End
Check harness Replace harness
Start
EndConnect as required Notify customer
6-2. LCD Not Display
Page 4
Y
N
Y
Y
N
N
Troubleshooting
6-4 SF700AT
Unplug P12 +5 V ?
Replace main
board
Check system reset
(U1 Pin 131) in
main board
Check Vcc
from P5-7 to P5-8
Vcc ≥ 4.5 V ?
See 6-2
Replace main board
Logic 'H' ? Replace OPE board
Start
End
Replace OPE board
and LCD module
A
6-3. System Not Initialized
Page 5
Y
Y
Y
Y
N
N
N
N
Troubleshooting
SF700AT 6-5
6-4. Document Not Fed
Check
Main XFE-B
Check LCD display
when document is
loading
Check +24 V from
P5-2 to P5-4 in
main board
'DOCUMENT
LOADING'
displayed ?
Replace Doc
Sensor board
Document fed ?
Replace power
supply
Replace main board
Replace motor ass'y
OK ?
End
+24 V OK ?
Check
motor pulse (P111, 13, 15, 17) in
main board
24V
0V
Start
Page 6
Y
N
N
N
N
Y
Y
Y
Troubleshooting
6-6 SF700AT
6-5. CIS LED Not Lit
Load document in
feeder
CIS LED lights OK ?
Check +5V, -12V
from P5-8, 10 to
P5-7, 9
OK ?
Replace power
supply
Replace CIS
Replace main
board
End
Check CIS from
P4-9
Low ?
Document fed ?
See 6-4
Press START key
Start
Page 7
Y
Y
N
N
N
Y
Y
N
Troubleshooting
SF700AT 6-7
Load document in
feeder
CIS LED on ? Copy produced ?
OK ?
Replace main
board
Replace motor
ass'y
Check
motor pulse (P111, 13, 15, 17) in
main board
24V
0V
Document fed ? Press START key
Start
See 6-5 1
End
See 6-4
6-6. No Copy Operation
Page 8
Troubleshooting
6-8 SF700AT
Y
Y
Y
Y
Y
NN
N
N
N
1
Copy quality
OK ?
Copy all black ?
TPH test
OK ? Replace TPH
Copy quality
OK ?
Replace main
board
Replace CIS
End
Copy all white ?
Page 9
Troubleshooting
SF700AT 6-9
6-7. OGM Not Playing Back
Y
Y
Y
Y
Y
Y
N
N
NN
N
N
Start End
End
OGM Play Back ?
Speaker On
Check
Mic signal from
CN3-6, 8?
Check
signal from
U16-pin4
Replace main
board
Check
signal from
U16 pin 4?
Check
signal from
CN14-1, 2?
Replace speaker
Replace Mic.
Replace OPE
board
Check
signal CONN B'd
from P22-1, 2?
Page 10
Troubleshooting
6-10 SF700AT
6-8. ICM Not Recording
Y
Y
Y
N
N
N
Start
End
Call machine
from other phone
ICM
Recording
mode ?
Check LIU board
OK ?
Replace LIU
board
Replace main
board
ICM Playback ?
Page 11
Troubleshooting
SF700AT 6-11
6-9. Malfunction in Auto Answer
Y
N
Y
N
Y
N
Start
Call machine from
another phone
Auto answer ?
Check signal on U7
pin3 in LIU board
Check Hook switch
OK ?
Replace Hook
switch board
End
Replace main
board
+5V
0V
?
Page 12
Troubleshooting
6-12 SF700AT
6-10. Malfunction in Manual Receiving
N
Y
Y
Y
N
N
Start
Lift handset from
fax then press
START
Machine goes
on-line ?
Check hook
switch in CONN
board
OK ?
Replace CONN
board
Replace main
board
End
Check LIU board
OK ? Replace LIU board
Page 13
Troubleshooting
SF700AT 6-13
6-11. Malfunction in Automatic Receiving
Y
Y
Y
Y
N
N
N
N
Start
Call fax machine
Check telephone
line
OK ?
Test customer Signal OK ? Replace LIU board
Replace main board
Check Tx/Rx signal
from CN13-2, CN134 in main board
Auto answer ? Receive data ?
See 6-9
End
End
Page 14
Troubleshooting
6-14 SF700AT
6-12. No Dial Tone
Y
Y
Y
N
N
N
Start
End
Lift handset from
fax machine
Dial tone OK ? Replace LIU board
Dial tone OK ?
Replace CONN
board
Dial tone OK ?
Replace main board
Page 15
Troubleshooting
SF700AT 6-15
6-13. Malfunction in Transmission
Y
Y
Y
N
N
N
Start
End
Load document in
feeder
Document fed ?
Call receiving
machine
Press START key
Start transmitting ?
Replace LIU board
OK ?
Replace main board
See 6-4
Page 16
Troubleshooting
6-16 SF700AT
6-14. Speakerphone Does Not Work
Y
Y
N
N
Start
End1
Speaker on Dial tone OK ? See 6-12
Replace Main
board
LCD display ?
Check Tx/Rx signal
from CN14-1, 2
Page 17
Troubleshooting
SF700AT 6-17
Y
Y
Y
Y
N
NN
N
1
End
Speaker On
Check
Mic signal from
CN3-8
Replace Mic.
Replace OPE
board
Replace speaker
Check
OPE board
Check
signal from
CN14-1, 2
Replace main
board
Check
signal from
CN14-1, 2
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