D9412G/D7412G/D7212G Installation & Troubleshooting Quick Reference Guide
Page 12
© 2004 Bosch Security Systems, Inc.
43700F
D9412G/D7412G/D7212G
Troubleshooting
3.6
Communication Failure
The panel goes into Communication Failure after ten unsuccessful attempts to reach the receiver. Follow the procedure in
Section 3.5 Phone Line Trouble on page 11 to verify that there is no problem with the phone lines at the installation. If the
phone lines are good, monitor the lines (preferably at the receiver) for the symptoms listed below.
Symptom
Diagnosis
Remedy
The line rings but the D6500
receiver does not pick up. The
Ring indicator LED on line card
does not light. You cannot hear
ring with headset at receiver
location.
Line is not ringing at
the receiver.
Verify that the lines are correctly connected to the
receiver.
Verify that correct prefixes and phone numbers for the
receiver have been programmed into the panel.
If completing the steps above does not correct the
problem, contact your telephone company repair
service.
The panel is unable to call out
when all 246 points are faulted.
The total current
draw is too much for
the panel.
Put command centers on a separate power supply to
get maximum current draw from points in alarm.
The line rings but the receiver
does not pick up. The Ring
Indicator LED on line card lights.
You can hear ring with test set at
receiver location.
Line card in receiver
may be faulty.
Review receiver manuals for troubleshooting
procedures.
Calls are not reaching
the receiver.
Verify that correct prefixes and phone numbers for the
receiver have been programmed into the panel.
Verify that the phone lines are not shorted between the
phone company's equipment and the receiver by
placing a call to the number for the receiver. If you
hear the line ring, but the ring detector doesn't light,
or if you hear a busy signal and the green on line (OL)
indicator is not lit, call the phone company for service.
The panel reaches a busy signal for
all ten attempts to reach the
receiver.
The receiver's call
load is too great.
Additional line cards and phone lines may be needed
for the receiver
The receiver answers the call and
provides an acknowledgment
tone, but the communicator does
not transmit reports.
The receiver is not
producing the correct
acknowledgment
tone.
Verify that the receiver is producing a 1400 Hz, 2300
Hz, or Modem IIIa
2
acknowledgment tone.
Panel does not connect to central
station.
The D136 relay used
for ground start
phone systems is
inserted incorrectly.
Insert the D136 relay in the GND STARTsocket
correctly. Also check that phone line is connected and
that phone jack is wired properly. See the Ground Start
section in the panel’s Operation and Installation Guide
for instructions.
The receiver is not
compatible with the
panel’s transmission
format.
Verify that the receiver is compatible with the format
the panel is using (either BFSK or Modem IIIa
2
Communications Format). See the Telephone
Connections section in the panel’s Program Entry
Guide.
The panel requires D6500 MPU and Line Card
EPROM revision 8.00 or higher.
The receiver answers the call and
provides an initial “handshake”
acknowledgment, but does not
acknowledge the panel’s report
transmission with a “kiss-off”
acknowledgment.
Noisy phone lines are
interfering with
report transmission.
Try making a voice call to the receiver on the line to
verify the noisy condition. It may be necessary to have
the phone company check the lines.
Table 8: Troubleshooting Communication Failures
