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Troubleshooting and Repair
126
025-9416
Symptom
Possible Problems
Solution
Pager alerts, but display
characters are missing.
Insufficient DTMF level
Readjust the FROM TEL levels per
Section 6.
Use Table 20 to help isolate and correct problems that may appear with voice paging output from
the Model 640.
The
italicized
words in the table are used to guide the system operator to the specific sight or
sound that defines the problem. They allow a quick scan of the table for the appropriate entry.
Table 20. Troubleshooting Voice Paging Output from the Model 640
Symptom
Possible Problems
Solution
Hum
or
buzz
present during
voice page.
Over deviation
Reduce the station VOICE pot setting.
Telco line imbalance
Call the telco CO.
Too much
background noise
present during voice page.
Overdriving transmitter
Reduce the station VOICE pot setting.
Trunk AGC too hot
Readjust the FROM TEL levels per Section
6.
Voice
quiet
at first, then
increases
during voice page.
Hybrid not balanced
Readjust the BAL R and BAL C levels per
Section 6.
FRONT PANEL LEDS
The front panel lights indicate the status of hardware and software signals in the system. They
can provide valuable information when troubleshooting paging operations. Table 21 outlines the
meaning of the lights labeled LINE, ANS, or ACT which relate to communication between the
CPU and the microprocessor on the peripheral board. As parts of the paging software become
active, the LEDs illuminate in different ways as described below. Also, refer to Section 3 for a
description of each LED.
Table 21. Troubleshooting Front Panel LED Operation
Software Step
LEDs
Light Activity
Power on
all ACT
all solid on
Boot-up sequence
READY
comes on solid at end of cycle - ready for paging
all ACT
all solid on, then rapidly blinking until end of cycle
MODEM, COM
intermittent flickering throughout cycle
New telco call
active trunk (A-D):
LINE
blinks for end-to-end and pulse
on for trunk answer
Содержание 640 DAPT XTRA
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Страница 197: ...Parts Lists and Schematics 025 9416 185 COMPONENT LOCATIONS Dual Dial Click 702 9119C Dual MF 702 9197D 1...
Страница 198: ...Parts Lists and Schematics 186 025 9416 RAM Disk 702 9386B ROM Disk 702 9389B...
Страница 199: ...Parts Lists and Schematics 025 9416 187 TNPP Interface 702 9362C 2...
Страница 200: ...Parts Lists and Schematics 188 025 9416 Terminal Block Adapter 702 9470B...
Страница 201: ...Parts Lists and Schematics 025 9416 189 CONFIGURATION DIAGRAMS Dual Trunk Telco DID 024 0076A...
Страница 202: ...Parts Lists and Schematics 190 025 9416 Dual Trunk Telco End to End 024 0077A...
Страница 203: ...Parts Lists and Schematics 025 9416 191 Dual Trunk Telco E M 024 0078A...
Страница 204: ...Parts Lists and Schematics 192 025 9416 Dual Trunk Telco Ground Start 024 0079A...
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