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Service Manual
Chapter 1. Introduction
a. Hardware
PC586 above
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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
9.216 MHZ
DAA
PC HOST
PROCESSOR
LINE
PHONE
Version 1.0
Page 2
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...