Instruction manual
Troubleshooting and Repair
025-9416 125
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.