ADS Environmental Services Model 4000 530017 A0 - Manual (Page 95)

Maintenance and Troubleshooting 5-9
Problem Monitor does not answer a telephone call.
Possible
Causes
Telephone connection at monitor may be damaged,
loose, or leaking.
Telephone cable may be noisy, damaged, or dead.
Lightning protection module may be damaged.
Battery pack may be dead or below minimum voltage
requirement (8.0 volts).
Monitor may be defective.
Lightning protection board in monitor may be defective.
Modem in monitor may be defective.
Modem in office or field computer may be defective.
Possible
Solutions
Make sure phone cable connection at monitor base is
secure and dry.
Check telephone cable for damage.
Use voltmeter to check voltage on telephone cable and
at lightning protection module. Voltage should be
approximately 48 Vdc on hook.
Replace 12-volt battery pack if below 8.0 volts.
Attempt to direct connect to monitor.
Contact telephone company for repair if noise, no tone,
or constant busy signal occurs at network interface box.