The Sentry Operating Program supervises all connected components and will display malfunctions on the screen. If a device in an apartment should fail, the Service window will show PANEL OUT, SMOKE TROUBLE, or CALL TROUBLE and the room number.

Other system devices such as utility panels, and console peripherals are monitored and will display a trouble message at the bottom of the screen during a malfunction.

2.0 ROOM PANEL TROUBLE

A PANEL OUT message in the Service window means that the panel is not responding to the console.

When more than one PANEL OUT message appears at one time, it usually indicates a power disturbance. To clear the trouble, temporarily turn off the power supply that powers those panels, (don't forget to disconnect a battery wire). Turn off the supply's power for 30 seconds, then reconnect the battery. This will allow all the panels to completely reset.

If the host panel's green, self-test indicator is blinking, and Room Panel Trouble shows on the screen for that panel, it usually indicates improper addressing. If the 6 position address dip-switches look properly set, try switching each one between ON & OFF a few times to assure a good contact.

If the panel's green indicator never blinks, check to see if the two red indicators flash approximately every 30 seconds. The red flashing shows the panel has proper voltage, is functioning, but does not receive data from the console.

When the red indicators never flash, check the panel's power by disconnecting the connector on the panel's back. Check the red indicators as you plug the connector back onto the panel. They should flash 2 or 3 times if the DC voltage is present.

If the red indicators still do not flash, check the wiring for DC voltage. Pins 1 & 2 of the connector, (white & black) should have 10 to 14 volts DC. If voltage is present, the panel probably has a bad fuse. NOTE: an improperly connected smoke detector is usually the cause of blown panel fuses. Test by replacing with a known good panel set to the same address.

Most room panel trouble is usually caused by bad wiring or incorrect address. It is easily tested by replacing the panel with a known functioning one, (set for the proper address).

NOTE: It is important to assure the correct polarity of the DC power (white & black) and the two data wires (red & green) are correct.

If the room panel trouble does not go away, check the data line for signal loss. See section 6.2

3.0 SMOKE DETECTOR TROUBLE

A SMOKE TROUBLE message in the Service window will appear if the smoke detector is defective or is incorrectly wired. Usually the host panel is functioning properly when this signal is sent. The host panel monitors the detectors DC current and the EOL resistor and will send this trouble signal if either is missing. Most smoke detector trouble stems from a wiring problem between the host panel and the detector.

All console peripherals are supervised and will indicate trouble in the video screen's message window. The trouble messages will be displayed as follows:

4.1 PRINTER NOT READY: shows when a printer is out of paper, turned off, or a cable is disconnected. Check printer and cable.

4.2 TROUBLE LOOP #: indicates a problem with an entire data loop. This usually means the data line wiring has become disconnected or the serial interface card for that loop has failed. Check all data line connections between the console and terminations.

The serial interface signal levels can be checked with an oscilloscope. Make sure the scope is isolated from AC ground by using a 3 to 2 prong adapter or isolation transformer on the line cord. Connect scope input ground to a Sentry common connection such as the negative side of the DC power. Use the scope to look at the data line by checking each side of the data line pair. The serial interface signal at the controller should always be 0 to 5 volts. If the signal is less than 5 volts, check it again with all remote devices disconnected. If the signal level increases with the devices disconnected, attempt to locate the one or more devices that could be pulling down the signal.

If the signal is still low with all devices disconnected, replace with new serial interface card.

An attempt can be made to repair the card in the field by replacing the driver and receiver chips. These parts are mounted in sockets and can be easily replaced. See details in the appropriate Interface Card Technical Manual. Make sure to set dip-switches properly.

4.3 PAGER TROUBLE: Indicates a problem with the pager device. Pager port devices are: Voice Synthesizer, Pocket Pager Transmitter, or a Remote Display Video Terminal.

The message indicates the pager device: is disconnected from the controller, has lost line power, or the port itself has failed. Check pager device and connection cable. Refer to the manual of the pager device that is installed.

4.4 ALARM PANEL DISCONNECTED: This message indicates that the Console Alarm Panel is disconnected from the HM-510 controller. This panel is a 2 gang wall plate near the screen that provides the audio alarm beep tone and the "System Failure" indicator. Check connection to the controller.

4.5 SERIAL INPUT TROUBLE: This message indicates a problem with the device or cable connected to the serial port.

The message indicates the device is disconnected from the controller, has lost power, or the port itself has failed. Check the connected device and connection cable. Refer to the manual of the connected device that is installed.

5.0 SYSTEM FAILURE

A buzzer and indicator light will activate on the console alarm panel to indicate system failure. The buzzer can be silenced by pressing the Silence button on the alarm panel. If the buzzer sounds without the LED, the controller has lost power or the panel has been disconnected from the controller.

This buzzer alarm and LED indicates the system has lost data communication to one or more serial data lines, and the watchdog has unsuccessfully attempted to restart the system.

The entire computer/controller is reset by either: 1, turning off power for 10 seconds, and wait for the program to completely reboot; or 2, if the HM-504 Rev B card is installed in the system, the controller can be reset by momentarily moving the Service Switch on the card to the TEST position then back to RUN.

The System Failure alarm usually indicates the controller has been damaged.

First check to make sure the controller is getting AC power through the Standby Power Source by observing the computer/controller's front mounted indicator LEDs.

If the controller's power is OK, one or more serial interfaces may be damaged. The console control card's watchdog system monitors one data line. When this data line fails, it will cause the System Failure alarm. The watchdog automatic reset feature can be disabled on systems with Rev B or later console control cards by moving the Service Switch to the TEST position.

Make sure to put the watchdog back into operation (RUN position), when testing is complete. Install the Sentry Operating Program and test the entire system.

Always check a repaired system by initiating an emergency call from each serial line to make sure it gets announced as the proper room number.