Service Manual
Chapter 4. Removal and Replacement
Step Description
Picture
1. Turn
over
modem
To disassemble 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 take apart the PCB
from the lower cover.
The PCB is the most important part
of modem.
Version 1.0
Page 10
Summary of Contents for GM56USB
Page 1: ...Service Manual GM56USB MODEM...
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...