Customer Care Solutions
DTX-3 Series Transceivers
Disassembly and Troubleshooting
Issue 1 4/03 Nokia Corporation
DTX-3
Disassembly and Troubleshooting CCS Technical Documentation
Table of Contents
Page No
Introduction ....................................................................................................................3
Disassembly, DTX-3 ...................................................................................................3
Troubleshooting .............................................................................................................3
General .........................................................................................................................3
Equipment needed .......................................................................................................4
Software needed ...........................................................................................................4
Visual overlook ............................................................................................................4
Initial connections ........................................................................................................5
Troubleshooting flowchart for Nokia 32 and DTM-3 .................................................6
Troubleshooting flowchart for DTX-3 ........................................................................7
Testing with WinTesla service software ...................................................................8
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DTX-3
CCS Technical Documentation Disassembly and Troubleshooting
Introduction
The purpose of this document is to help in hardware troubleshooting of the Nokia 32 PBX
Connectivity Terminal.
TME-3/TME-4 troubleshooting is described in the TME-3/TME-4 manual.
DTX-3 module is not designed to be repaired, except for the Application Interface Connector.
Disassembly, DTX-3
Figure 1: DTX-3 disassembly
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Disassembly and Troubleshooting CCS Technical Documentation
Troubleshooting
General
The purpose of this document is to help the service point to solve which part of the radio
is faulty. The service policy with the Nokia 32 connectivity terminal is, that only the TME3/TME-4 will be repaired.
Both TME-3 and DTX-3 covers can be replaced if necessary.
Equipment needed:
• SIM card without PIN query
•ACW-5 Adapter
• ACW-5 mains cable
• ACW-5 power cable
• A landline telephone
• A Nokia 32 (including TME-3/TME-4 and DTX-3 modules)
•T-piece
• DKT-7A service cable
• CA-15DS audio test cable
• SCS-24 audio test cable
• Personal computer (PC)
Software needed:
• Wintesla sw for DTX-3
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DTX-3
CCS Technical Documentation Disassembly and Troubleshooting
Visual overlook
The LED indicators are split into two parts:
Figure 2: LED indicators
LED indicators 2&3 are used to tell in which mode the line adapter is at the moment. LED
indicator 1 is used to tell the state of the embedded GSM terminal. At least one LED indicator from both parts should be on or blinking. If e.g. both LED indicator 2 and LED indicator 3 are off, the fault most probably is in the application module.
Initial connections:
1. Insert SIM card to TME-3/TME-4.
2. Attach DTX-3 to TME-3/TME-4.
3. Connect CA-15DS cable between one input port of T-piece and EXT connector.
4. Connect SCS-24 cable between the other input port of T-piece and TRUNK connector.
5. Connect cable DKT-7A between output port of T-piece and PC.
6. Connect power cable between DTX-3 and ACW-5.
7. Connect mains cable between ACW-5 and mains plug. See the instructions on the bottom side of the adapter.
8. Choose Testing -> Self Tests... from Wintesla.
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DTX-3
Disassembly and Troubleshooting CCS Technical Documentation
DKT-7A
SCS-24
DA-15DS
Nokia 32
ACW-5
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DTX-3
CCS Technical Documentation Disassembly and Troubleshooting
Troubleshooting flowchart for Nokia 32 and TME-3/TME-4
Start
Factory reset
DTX-3 self
test pass ?
Y
Swap TME-3
Refer to TME-3 service instruction
Disconnect T-piece from DTX-3
TRUNK connector and audio cable
from EXT connector
N
TME-3 LED's blink
according to guide ?
N
DTX-3
failure
Y
N
Voice call tests to both
directions works ?
Y
End
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DTX-3
Disassembly and Troubleshooting CCS Technical Documentation
Troubleshooting flowchart for DTX-3
DTX-3
failure
Swap DTX-3
N
Set initial
connections
Set country
parameter
DTX-3 self
test pass ?
Y
End
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CCS Technical Documentation Disassembly and Troubleshooting
Testing with WinTesla service software
Set the Initial connection setup.
Figure 3: Test equipment set-up
2
1
3
6
4
No. Type Description Code
1 DTX-3 APPLICATION MODULE 0630596
2 ACW-5 POWER SUPPLY 0630526
3 DKT-7A MBUS CABLE 0730211
4 T-CONNECTOR 4626134
5 CA-15DS LINE ADAPTER TEST CABLE 0730302
6 SCS-24 LINE ADAPTER TEST CABLE 0730223
15
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DTX-3
Disassembly and Troubleshooting CCS Technical Documentation
WinTesla tests
Testing of Line adapter circuits
Choose Testing -> Audio -> Line Adapter...
Hook state indicator
Figure 4: Hook on/off test window 1
indicators
Check that the Hook off/on indicator state will change when you change the hook state.
If not, the DTX-3 is faulty.
Figure 5: Hook on/off test window 2
indicators
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CCS Technical Documentation Disassembly and Troubleshooting
DTMF receiving and transmitting
Write some numbers to the DTMF string field. Change the hook off state to 'Off',
press the S
the 'Received string:' row, that all numbers that you just selected were transmitted.
end button and listen from the earpiece the DTMF tones. Check also from
Figure 6: DTMF test window
DTMF String field
Received String field
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Disassembly and Troubleshooting CCS Technical Documentation
Ringing Voltage Indicator
Change the 'Trunk line state' selection to the Ring position.
Figure 7: Audio&Line Test window
Ring position
Ring indicator state
Check that also the state of the Ring indicator changes (it might take few seconds). If
the indicator will not change it's position, change the 'Trunk line state' choice to it's
original setting, and try again couple of times. If the indicator will not change it's position, the DTX-3 is probably broken.
Activate the HF-state from the land-line telephone, or take the earpiece to listen the signal tones. From the Tone generator field you can select different tones to be listened.
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CCS Technical Documentation Disassembly and Troubleshooting
Self tests
The following build in selftests will be supported by Nokia 32 in addition to Nokia 22
selftests:
• Line voltage
• Ringing generation/detection
• DTMF generation/detection
• GSM link test
For more detailed information see Ratti SW Selftest Functional Specification .
A dialog box should be developed to start selftests.
The result of individual selftest should be stated clearly with passed/failed/not executed
and the overall result as well.
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DTX-3
Disassembly and Troubleshooting CCS Technical Documentation
Figure 8: Audio codec Test window
If you can not hear these tones, the audio codec is probably faulty.
Try to make also a test call with the land line telephone.
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