Genius GM56USB Service Manual Download | Manualshive

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Service Manual

GM56USB MODEM

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Summary of Contents for GM56USB

Page 1: ...Service Manual GM56USB MODEM...

Page 2: ...hapter 2 Testing Procedures 3 A Testing Flow Chart 3 B Check U1 Pin 1 5V 4 C Check U1 Pin 3 Data Clock 5 D Check X1 Working Frequency 6 E Check IC1 Pin 41 Reset Signal 7 F Check K4 Pin4 8 Chapter 3 Tr...

Page 3: ...RJ 11 cable USB Port USB Cable Speaker b Software Win98 above GM56USB Driver c Function Block USB ST7554 USB MODEM CONTROLLER TQFP48 7 7 1 4 MM STLC7550 Analog front end AFE TQFP48 7 7 1 4 MM CRYSTAL...

Page 4: ...edures A Testing Flow Chart Check U1 Pin 1 REPLACE U1 T T F F Check U1 Pin 3 T Check Working FR T Check IC1 Pin41 T F F F REPLACE K4 REPLACE C5 IC1 REPLACE K1 IC2 RESOLDER R8 R9 REPLACE U1 IC2 Check K...

Page 5: ...Service Manual B Check U1 Pin 1 5V U1 PIN 1 5V Version 1 0 Page 4...

Page 6: ...Service Manual C Check U1 Pin 3 Data Clock U1 PIN 3 Version 1 0 Page 5...

Page 7: ...Service Manual D Check X1 Working Frequency C10 X1 C16 IC2 Version 1 0 Page 6...

Page 8: ...Service Manual E Check IC1 Pin 41 Reset Signal IC1 Version 1 0 Page 7...

Page 9: ...Service Manual F Check K4 Pin4 K4 PIN4 Version 1 0 Page 8...

Page 10: ...ooting Guide Problems Probable Reasons Solutions 1 Dialing fail 1 PCB defect 1 Replace K4 2 Replace IC1 3 Replace IC2 1 Connection fail 1 PCB defect 1 Replace U1 2 Replace IC1 3 Replace IC2 4 Replace...

Page 11: ...mble the modem you have to turn over modem 2 Loose screws Using screwdriver to loose screw 3 Take apart rear flat After taking screw off you can take up the upper cover 4 Take apart PCB Now You can ta...

Page 12: ...Description Part number U1 USB6B1S08 K1309061 X1 9 216MZH K0809012 IC1 ST7550 K1309060 K4 K0917006 IC2 ST7554 K1309059 C16 27PF 0603 K1509048 C10 33PF 0603 K1509046 C5 0 1U 0603 K1509028 Chapter 6 To...

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