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Summary of Contents for Genius GM56USB
- Page 1 Service Manual GM56USB MODEM...
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Page 2: Table Of Contents
Service Manual Table of Contents GM56USB MODEM ........................0 Chapter 1. Introduction ........................2 a. Hardware ..........................2 b. Software ..........................2 c. Function Block ........................2 Chapter 2. Testing Procedures ......................3 A. Testing Flow Chart.......................3 Check U1 Pin 1 +5V ......................4 Check U1 Pin 3 Data Clock ....................5 D. -
Page 3: Chapter 1. Introduction
♦ PC586 above ♦ RJ-11 cable ♦ USB Port ♦ USB Cable ♦ Speaker b. Software ♦ Win98 above ♦ GM56USB Driver c. Function Block ST7554 STLC7550 PC HOST USB MODEM Analog-front-end LINE PROCESSOR CONTROLLER (AFE) PHONE TQFP48(7*7*1.4 TQFP48(7*7*1.4 CRYSTAL 9.216 MHZ... -
Page 4: Chapter 2. Testing Procedures
Service Manual Chapter 2. Testing Procedures A. Testing Flow Chart START Check U1 REPLACE U1 Pin 1 Check U1 REPLACE U1,IC2 Pin 3 Check REPLACE K1,IC2 Working FR. RESOLDER R8,R9 Check IC1 REPLACE C5,IC1 Pin41 Check K4 REPLACE K4 Pin 4 Version 1.0 Page 3... -
Page 5: Check U1 Pin 1 +5V
Service Manual B. Check U1 Pin 1 +5V U1 PIN 1 +5V Version 1.0 Page 4... -
Page 6: Check U1 Pin 3 Data Clock
Service Manual C. Check U1 Pin 3 Data Clock U1 PIN 3 Version 1.0 Page 5... -
Page 7: Check X1 Working Frequency
Service Manual D. Check X1 Working Frequency Version 1.0 Page 6... -
Page 8: Check Ic1 Pin 41 Reset Signal
Service Manual E. Check IC1 Pin 41 Reset Signal Version 1.0 Page 7... -
Page 9: Check K4 Pin4
Service Manual F. Check K4 Pin4 K4 PIN4 Version 1.0 Page 8... -
Page 10: Chapter 3. Troubleshooting Guide
Service Manual Chapter 3. Troubleshooting 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. -
Page 11: Chapter 4. Removal And Replacement
Service Manual Chapter 4. Removal and Replacement Step Description Picture 1. Turn over To disassemble the modem, you modem have to turn over modem. 2. Loose screws Using screwdriver to loose screw. 3. Take apart After taking screw off, you can take rear flat up the upper cover 4. -
Page 12: Chapter 5. Parts List
Service Manual Chapter 5. Parts List Description Part number Description Part number U1 USB6B1S08 K1309061 X1 9.216MZH K0809012 IC1 ST7550 K1309060 K0917006 IC2 ST7554 K1309059 C16 27PF 0603 K1509048 C10 33PF 0603 K1509046 0.1U 0603 K1509028 Chapter 6. Tools 1.Screwdriver Cross 2.Oscilloscope Version 1.0 Page 11...
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