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Troubleshooting and Repair
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Table 18. Troubleshooting General Paging Output From the Model 640
Symptom
Possible Problems
Solution
Page is transmitted, but
pager does not alert.
Incorrect capcode
Edit subscriber Capcode. Verify 2-tone
frequencies.
Incorrect function code
Edit Pager Definition FunctionCode field.
Insufficient RF deviation
Readjust the station TONE pot for 3.5 kHz
deviation per Section 6.
RF frequency is off
Adjust the transmitter center frequency to
match pagers.
Digital polarity reversed
Edit DigDataPolarity field in Transmitter
Key Type database.
Page is transmitted, but
pager only alerts sometimes.
Insufficient RF deviation
Readjust the station TONE pot for 3.5 kHz
deviation per Section 6.
RF frequency is off
Readjust the transmitter digital for 4.5 kHz
deviation per Section 6.
Insufficient tone duration
Edit the 2-tone pager definition fields
SecondsTone1/2 appropriately
Zone outputs do not change.
No pull-up resistors
Install pull-up resistors to +5 volts at the
zone outputs (pins 21, 22, 46, and 47).
Use Table 19 to help isolate and correct problems that may appear with display paging (numeric
or alphanumeric) output from the Model 640.
Table 19. Troubleshooting Display Paging Output from the Model 640
Symptom
Possible Problems
Solution
Terminal accepts display
page, but does not
transmit.
Subscriber record programmed
with an illegal function code
Edit appropriate Pager Definition
FunctionCode field.
Voice and display limits both
programmed as nonzero
Only HSC pagers allow both display
and voice paging. Modify one limit to
equal zero.
COR / terminal busy on
Fix radio station connection.
Pager alerts, but display is
unintelligible.
Alpha data to numeric pager or
vice versa
Edit Pager Definition Alpha field.
Incorrect function code
Edit Pager Definition FunctionCode
field.
Insufficient RF deviation
Readjust the station TONE pot for 3.5
kHz deviation per Section 6.
RF frequency off
Readjust the transmitter digital for 4.5
kHz deviation per Section 6.
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...
Page 177: ...Parts Lists and Schematics 025 9416 165...
Page 178: ...Parts Lists and Schematics 166 025 9416...
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Page 180: ...Parts Lists and Schematics 168 025 9416...
Page 181: ...Parts Lists and Schematics 025 9416 169...
Page 182: ...Parts Lists and Schematics 170 025 9416 Silkscreen...
Page 185: ...Parts Lists and Schematics 025 9416 173 Schematic...
Page 186: ...Parts Lists and Schematics 174 025 9416...
Page 187: ...Parts Lists and Schematics 025 9416 175...
Page 188: ...Parts Lists and Schematics 176 025 9416...
Page 189: ...Parts Lists and Schematics 025 9416 177...
Page 190: ...Parts Lists and Schematics 178 025 9416 Silkscreen...
Page 193: ...Parts Lists and Schematics 025 9416 181 Schematic...
Page 194: ...Parts Lists and Schematics 182 025 9416...
Page 195: ...Parts Lists and Schematics 025 9416 183...
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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