Genius GM56E-V User manual

Service Manual
GM56E-V MODEM
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Table of Contents
GM56E-V MODEM ....................................................................................................................0
Chapter 1. INTRODUCTION...........................................................................................................2
a. Hardware ...............................................................................................................................2
b. Software ................................................................................................................................2
c. Function Block ......................................................................................................................2
Chapter 2. Testing procedures...........................................................................................................3
A. Testing Connection Fail Flow Chart ....................................................................................3
B. Testing Dialing Fail Flow Chart...........................................................................................3
C. Check Working Frequency...................................................................................................4
D. Check U7 PIN2,3,8,9 +5V Voltage......................................................................................5
E. Check U4 PIN2 Signal Wave...............................................................................................6
F. Check U4 PIN4 Signal Wave...............................................................................................7
G. Check U4 PIN11 Signal Wave .............................................................................................8
H. Check U1 PIN4 Signal Wave...............................................................................................9
Chapter 3. Troubleshooting Guide..................................................................................................10
Chapter 4. Removal and Replacement............................................................................................ 11
Chapter 5. Parts list .........................................................................................................................12
Chapter 6. Tools ..............................................................................................................................12
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Chapter 1. INTRODUCTION
a. Hardware
PC586 above♦
♦
♦
♦
♦
♦
RS232 cable
RJ-11 cable
Speaker
b. Software
Win98 above
GM56E-V Driver
c. Function Block
Modem chip
TP560X
DAA (SI3012
& SI3021)
RS232
INTERFACE
CRYSTAL
36.864 MHZ
MIC/SPK
INTERFACE
External
Memory
LINE
PHONE
MIC
SPK
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Chapter 2. Testing procedures
A. Testing Connection Fail Flow Chart
B. Testing Dialing Fail Flow Chart
TEST Freq. REPLACE U6,X1
TEST U7
END
REPLACE U7
T
T
F
F
START
F
TEST U4 PIN2
TEST U4 PIN11
TEST U1 PIN4
REPLACE U1,U4,Q2,Q4,D1
REPLACE U1,U4,Q2,Q4,D1
END
TEST U4 PIN4 REPLACE U1,U4,Q2,Q4,D1
REPLACE U1,U4,Q2,Q4,D1
START
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C. Check Working Frequency
CHECK Y1
36.864MHZ
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D. Check U7 PIN2,3,8,9 +5V Voltage
U7 PIN2,3
8
,
9
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E. Check U4 PIN2 Signal Wave
U4 PIN2
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F. Check U4 PIN4 Signal Wave
U4 PIN4
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G. Check U4 PIN11 Signal Wave
U4 PIN11
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H. Check U1 PIN4 Signal Wave
U1 PIN4
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Chapter 3. Troubleshooting Guide
Problems Condition Probable Reasons Solutions
1. Dialing fail 1. Error code 680 1. Oscillator NG
2. PCB defect
1. Replace Y1
2. Replace U6
3. Replace U7
4. Replace U8
5. Replace U11
1. No power 1. MR LED doesn’t light 1. Faulty Adaptor
2. PCB defect
1. Replace Adaptor
2. Replace U14
1. Connection fail 1. Error code 630 1. PCB defect 1. Replace D1
2. Replace U2
3. Replace U4
4. Replace Q2
5. Replace Q4
1. No sound after
connection
1. No sound after dialing 1. PCB defect 1. Replace U3
2. Replace Speaker
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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 2 screws.
3. Take apart
rear flat
After taking all screws off, you can
take up the rear flat.
4. Take apart
PCB
Now, You can take apart the PCB
from the upper cover.
The PCB is the most important part
of modemt.
1 2
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Chapter 5. Parts list
Description Part number Description Part number
U8 FLASHROM K0309035 Y1 36.846MHZ K0809014
U14 IC34063 K0309036 SPK1 K1134000
U11 EEPROM 93C46 K1303040 SPCBA GM56E-V K0169026
U3 LM386 K1307019 Adaptor 12VAC(EU.) K1217031
U7 GD75323D K1307059 Adaptor 12VAC(U.K.) K1217032
U4 SI3021 K1309084 Adaptor 12VAC(U.S.) K1217030
U2 SI3000 K1309085
Chapter 6. Tools
1.Screwdriver cross
2.Oscilloscope
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