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Troubleshooting and Repair
025-9416
129
TST
1
TST
2
TXB
RXB
TXA
RXA
To Main Processor
Board (J8)
⇓
Rear of Model
640 Chassis
⇐
J1 - Serial
Port A
J2 - Serial
Port B
Figure 63. TNPP Interface Board LEDs
Table 23 describes each of the LEDs on the TNPP interface card.
Table 23. Function of TNPP Interface Card LEDs
Label
Identifies
Operation
TST1
Test 1
Lights to indicate a self-test of the DB-9 serial port J1.
TST2
Test 2
Lights to indicate a self-test of the DB-9 serial port J2.
TXB
Transmit B - output
Lights to indicate that RS-232 serial data is being transmitted out port
J2.
RXB
Receive B - input
Lights to indicate that RS-232 serial data is being received on port J2.
TXA
Transmit A - output
Lights to indicate that RS-232 serial data is being transmitted out port
J1.
RXA
Receive A - input
Lights to indicate that RS-232 serial data is being received on port J1.
The two test LEDs should light continuously during the boot-up cycle, then flicker and go out
right before the terminal enters operational mode (the front panel “READY” LED is lit).
Testing the TNPP Card
Another way to troubleshoot the TNPP link status is to short the transmit and receive signals
(pins 2 and 3) on the serial interface port together. This effectively sends the pages out and right
back into the TNPP card. Once the pins are connected, the network link should report as “up.” If
this does not produce a cyclical passing of pages, then the interface card itself is malfunctioning.
Summary of Contents for 640 DAPT XTRA
Page 2: ......
Page 6: ...Statements vi 025 9416...
Page 20: ...Introduction 8 025 9416...
Page 26: ...Specifications 14 025 9416...
Page 96: ...Installation 84 025 9416...
Page 126: ...Optional Equipment Installation 114 025 9416...
Page 134: ...Voice Prompts 122 025 9416...
Page 174: ...Parts Lists and Schematics 162 025 9416 Schematic...
Page 175: ...Parts Lists and Schematics 025 9416 163...
Page 176: ...Parts Lists and Schematics 164 025 9416...
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Page 182: ...Parts Lists and Schematics 170 025 9416 Silkscreen...
Page 185: ...Parts Lists and Schematics 025 9416 173 Schematic...
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Page 188: ...Parts Lists and Schematics 176 025 9416...
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Page 190: ...Parts Lists and Schematics 178 025 9416 Silkscreen...
Page 193: ...Parts Lists and Schematics 025 9416 181 Schematic...
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Page 196: ...Parts Lists and Schematics 184 025 9416 Silkscreen...
Page 198: ...Parts Lists and Schematics 186 025 9416 RAM Disk 702 9386B ROM Disk 702 9389B...
Page 199: ...Parts Lists and Schematics 025 9416 187 TNPP Interface 702 9362C 2...
Page 200: ...Parts Lists and Schematics 188 025 9416 Terminal Block Adapter 702 9470B...
Page 201: ...Parts Lists and Schematics 025 9416 189 CONFIGURATION DIAGRAMS Dual Trunk Telco DID 024 0076A...
Page 202: ...Parts Lists and Schematics 190 025 9416 Dual Trunk Telco End to End 024 0077A...
Page 203: ...Parts Lists and Schematics 025 9416 191 Dual Trunk Telco E M 024 0078A...
Page 204: ...Parts Lists and Schematics 192 025 9416 Dual Trunk Telco Ground Start 024 0079A...
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