Page 12
MP 4000
Troubleshooting Guide
Troubleshooting Guide
Troubleshooting Guide
Troubleshooting Guide
Troubleshooting Guide
NO DIAL TONE
1.
Check input power at unit. Should
be 12 VAC. Check fuse.
2.
Check that unit is properly
grounded to a good Earth ground.
3.
Current starved. Increase AC
input wire size.
4.
Remove power, wait 5 seconds,
restore power. Check for dial tone.
5.
Check for phone line. Should be
48-52 VDC across phone line
terminals (on hook).
6.
Check VOLUME adjustment on PC
board.
7.
Check “SPKR” plug on PC board.
Make sure speaker is properly
plugged in.
8.
Verify that contacts and wires are
clean and tight.
CANNOT PROGRAM
1.
Incorrect/lost program code.
2.
Not entering “*” before program
code.
3.
Try ‘NO DIAL TONE’
troubleshooting procedures.
4.
Not pressing start button before
entering code.
5.
Keypad damaged. Check for
vandalism.
6.
Check that Program Prom/
Microprocessor is fully seated.
LOSES MEMORY
1.
Electrical noise on power line.
Install EMI/RFI filter.
2.
Excessive electrical noise from
strike. Use low current strike.
3.
Unit transformer shared with
another device (i.e. door strike).
UNIT NOT DIALING
1.
No phone number programmed
under that resident code.
Reprogram and try again.
2.
Incorrect resident code length
entered (see SETUP).
3.
Unit dialing Touch-tone on a
rotary telephone line.
4.
Check phone line at board
terminals. Should be 48-52 VDC
(on hook).
5.
If on an in-house phone system,
incorrect dialing procedure to
access outside line/extension. May
require special software.
6.
Low AC Supply voltage or
incorrect/defective transformer.
TENANT CANNOT ACTIVATE STRIKE/
GATE
1.
Tenant not pressing correct
number on telephone.
2.
Strike/gate operator not wired
correctly.
3.
Missing or incorrect power to
strike or gate operator.
4.
Current starved. Increase wire
size.
5.
Tone may be too brief in duration
(cordless phones, etc.).
AC HUM IN EARPIECE/SPEAKER
1.
Telephone wires running in same
conduit as AC power.
2.
Unit not properly grounded.
3.
Defective microphone.
TENANT CANNOT HEAR VISITOR
1.
Defective microphone.
2.
Too much background or street
noise. Relocate unit.
Feel free to contact our Tech
Services Dept.
(800 842-7444 or (951 371-1730
www.TrigonElectronics.com
