TROUBLE SHOOTING GUIDE FOR VIDEO SYSTEM 100
ALL TESTS BELOW ARE ON VA/100 PSU/CONTROLLER UNLESS OTHERWISE STATED. IF ANY OF
THE VOLTAGE READINGS ARE NOT CORRECT, DISCONNECT WIRING FROM RELEVANT
TERMINALS AND RE-MEASURE.
NOTHING WORKS AT ALL
1. CHECK MONITOR SWITCHED ON AT THUMBWHEEL (CLOCKWISE DIRECTION).
2. CHECK 240VAC INTO VAS/100 & 17.5VDC ACROSS A1(+VE) & A2(-VE) ON VAS/100.
3. CHECK FOR 17.5VDCACROSS B1 (+VE) & B2(-VE), B5 & B6 AND C5 & C6 WHERE TERMINAL 5 IS
ALWAYS NEGATIVE.
4. CHECK FOR 17.5VDC ACROSS 5 & 6 AT MONITOR & PANEL.
5. CHECK IF MONITOR PREVIEWS (PRESS CAMERA BUTTON ON MONITOR).
NO PREVIEW AT MONITOR
1. CHECK B5 & B8 = 1VDC PRIOR TO PREVIEW. IF B5 & B8 = 10VDC SYSTEM IS ACTIVE & PREVIEW
DISABLED UNTIL CALL MADE/SYSTEM TIMER ELAPSES. (I.E. ANOTHER MONITOR IS ON).
2. CHECK B5 & B9 = 0VDC WHEN PREVIEW (CAMERA) BUTTON PRESSED.
3. CHECK B5 & B8 = 10VDC AFTER PREVIEW PRESSED.
4. CHECK 5 & 8 = 10VDC AT MONITOR WITH MONITOR IN SITU (IF NOT CHECK CONTINUITY OF
LINE 8 TO MONITOR).
NO CALL TO MONITOR
1. CHECK FOR 15VDC ACROSS C5 & C8.
2. CHECK FOR 15VDC ACROSS CORRESPONING TERMINALS ON PANEL.
3. CHECK FOR 10VDC ACROSS C5 & CALL LINE (7 IN MONITOR) DURING CALL.
4. IF CHECK 3 = 15VDC, CHECK DIP SWITCH 3 ON IN MONITOR & CONTINUITY OF CALL LINE
(SHOULD = 1K ohm BETWEEN 5 & CALL LINE).
5. IF CALLING MORE THAN ONE MONITOR ENSURE DIPSWITCH 3 IS ON IN ONE ONLY. ALSO
ENSURE ADDITIONAL PSU(‘S) ADDED AS REQUIRED.
NO AUDIO TO MONITOR
1. CHECK VOLUME LEVEL IN PANEL NOT AT MINIMUM (FULLY ANTI-CLOCKWISE IS MINIMUM ON
PHONE POTENTIOMETER).
2. CHECK FOR 17.5VDC ACROSS 5 & 6 IN PANEL.
3. CHECK FOR 17.5VDC ACROSS 6(+VE) & 14 (-VE) AFTER CALL/PREVIEW IN PANEL (IF NOT
CHECK CONTINUITY 14 FROM VA/100 TO 14 ON PANEL).
4. IF MVA/100.01 PANEL WITHOUT MR/100, CHECK JUMPER SW2 IS ON.
5. REMOVE CABLES 11,12 & 14 IN PANEL & PLACE LINK BETWEEN TERMINALS 11 & 12 AND
TERMINALS 5 & 14. THIS SHOULD RESULT IN FEEDBACK AT THE PANEL.
NO AUDIO TO PANEL
1. CHECK VOLUME LEVEL IN PANEL NOT AT MINIMUM (FULLY ANTI-CLOCKWISE IS MINIMUM ON
SPEAKER POTENTIOMETER).
2. CHECK FOR 15VDC ACROSS B5 & B9.
3. ACTIVATE MONITOR (PREVIEW OR CALL) & CHECK FOR 12VDC ACROSS B5 & B9 WITH PHONE
OFF HOOK.
4. REPEAT CHECKS 2,3 & 5 FROM NO AUDIO TO MONITOR.
5. CHECK CONTINUITY OF C12 VA/100 TO TERMINAL 12 AT THE PANEL.(SHOULD = 5VDC ACROSS
C5 & C12 AT VA/100 AND 5 & 12 AT THE PANEL)
