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Troubleshooting
+5V, +12V of CN701 is normally inputted after
connection of power cable?
X201, X301, X401 oscillate ?
Check power short and power supply cable
connection state
¤
IC201 75pin, IC301 12pin, 54pin IC401 87pin for power input
¤Ł
Check C303, C304, C207, C208, R210, C402, C401soldering
¤Ø
If normal replace X201, X301, X401
IC301 19pin change from 0V to 5V ?
Inputted Voltage of IC301 5pin is 1.5V~2.0V ?
Check R401, R402, R6A4, R6A7 soldering
Y
Y
N
N
N
N
N
Input / output IC301 57pi n~80pin, 1pin~4pin
pulse waveform ?
Check IC301 pin soldering
Replace IC301, IC306 after soldering
Y
Y
Y
N
In case FLASH ROM Memory of IC301 16pin
0V, and Rom memory inputted 5V ?
Check R320, R321 soldering
Check R301, R302 soldering
Equipments required at repair
1. Oscilloscope(100MHz or more ) 2. PROBE for Oscilloscope(10:1)
3. PC(486 ormore)
Verify the circuit of power unit and the first status(Plug-in the power cable without I/F cable and verify.)
A
SCR-140(A4)-en 99.3.15 8:38 AM ˘
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Содержание SC-140
Страница 2: ... Samsung Electronics Co Ltd MARCH 1999 Printed in Korea Code No BG68 00045A Electronics ...
Страница 48: ...8 7 Operational Position Diagram SCR 140 A3 99 3 15 11 19 AM 4 ...
Страница 49: ...10 9 Operational Position Diagram SCR 140 A3 99 3 15 9 1 AM 5 ...
Страница 50: ...12 Operational Position Diagram 11 SCR 140 A3 99 3 15 9 1 AM 6 ...
Страница 51: ...24 23 Circuit Diagram SCR 140 A3 99 3 15 9 0 AM 3 ...