NuTone IM-440 Series - Manual (Page 15)

15
KEY DISPLAY KEY DISPLAY
No key 1:00 Memory 2 1:14
Scan 1:01 Memory 3 1:15
▲
1:02 Memory 4 1:16
▼
1:03 Memory 5 1:17
Program Off 1:04 Memory 6 1:18
AM 1:05 Play/Pause 1:19
FM 1:06 RDM/RPT 1:20
Tape 1:07 Track 1:21
Aux 1:08 Track 1:22
Timer 1:09 Display 1:23
Inside/Patio 1:10 Stop 1:24
Door Talk 1:11 Time Set 1:25
End Call 1:12 Memory Set 1:26
Memory 1 1:13
OPERATIONAL CHECKOUT (Continued)
▲
▲
Display Voltage at Microprocessor
2:3.0 3.0 volts
2:1.9 1.9 volts
2:0.1 .1 volts
In this mode, the hours represent the diagnostic test, and the
minutes indicate the voltage at the master station’s
microprocessor.
Voltage Window
Mode Maximum Minimum
End Call .4 volts 0 volts
Inside/Patio 2.4 volts 1.6 volts
Door Talk 3.6 volts 2.8 volts
Quiescent 5.0 volts 4.3 volts
The control voltage windows for the three intercom modes
and quiescent mode are listed above. For proper intercom
operation, the control voltage produced when an intercom
key is pressed at a remote station should fall between the
voltage indicated.
NOTE: Pressing the END CALL, DOOR TALK, or
INSIDE/PATIO keys at the master station will not change the
voltage on the control line. If a remote station does not
produce a voltage within the above window for a specific
intercom function, check the following:
• Make sure all connections from the master station are
properly installed at the terminal board.
• Check IW-6 connections at the master station terminal
board and at each remote station.
• Confirm that the suspect remote station functions properly
by replacing it with a known good remote station.
Display Test – Displays all segments in the LCD display. To
activate, press and hold the following in this order:
1. ▲ key 3. Memory 3 key
2. ▼ key 4. Release all keys
RESETTING THE MICROPROCESSOR
NOTE: Resetting the microprocessor will cause the radio
memory channels and clock time to be lost.
Should the system not operate properly, the internal
microprocessor may require resetting. To reset the
microprocessor, use the point of a pen to press the reset
button through the access hole behind the right lower door.
See “System Operating Control” section.
DIAGNOSTIC TESTS
The following diagnostic tests have been incorporated into
the NuTone IM-4406 master station to assist in system
troubleshooting.
• Master station keyboard test
• Remote station control voltage test
• Display test
The following applies to all diagnostic tests:
1. To access any of the diagnostic tests, the system must be
in the PROGRAM OFF mode.
2. Pressing the MEMORY SET key will end the current
diagnostic test.
3. The current diagnostic test will end after one minute of
inactivity.
Remote Station Keyboard Test – Verifies that all keys on
the master station are functioning properly. To activate: Press
and hold the following key in this order:
1. ▲ key 3. Memory 1 key
2. ▼ key 4. Release all keys
In this mode, the hours in the display represents the current
diagnostic test and the minutes indicate the current key being
pressed. The following will be displayed as the key is
pressed.
Remote Station Control Voltage Test – Displays the
voltage at the master’s microprocessor control line. To
activate, press and hold the following keys:
1. ▲ key 3. Memory 2 key
2. ▼ key 4. Release all keys
Example:
PLEASE NOTE: An incorrect voltage caused by
miswiring, shorted wiring or a defective remote
station may cause the radio and/or CD Player to
turn off/on, thus preventing the unit from
entering the diagnostic mode. Should this occur,
the master station’s control timer will stop the
on/off cycling after 30 seconds.