12
A100K10873
VSP 12-Way Batteryless Telephone System
Technical Manual
5 Troubleshooting
5.1 Conversation Lines
One station is not working
● Verify that the station has the correct address set on the DIP
switches
● Check the cable and terminal connections numbers 1, 2, 3 and 4 in
the non-working station
One or more stations are not working
● Check connection cable
● Check plugs/sockets for portable units
● Check handset/headset used
No stations in the system are working
● Check that the voltage on P6 is between 20 and 39 V.
● Check quiescent current.
-
The amplifier quiescent current can be measured by replacing the
strap P6 with a uA-meter.
-
The quiescent current is adjusted by RV1 to 20 uA at U
C7
= 20-30 V.
● The amplifier in VSP-211-L may be defective.
-
Replace the station with one that is in working order.
5.2 Call Tone
Extension numbers 11 and 12 do not work. No call tone
●
Jumpers on pins J2 and J3 are not inserted.
-
Insert jumpers on pins J2 and J3 located on the right side of the
DIP switch.
Station receives calls from two or more lines
● Several extension numbers are set.
-
Verify that the station has the correct extension number set on the
DIP switch.
No call tone in own station
● Check the P8/P9 connections to the generator and rectifier in the
station
● Check that the generator is working by use of AC voltmeter while
operating the crank or by use of an ohm-meter between P8 and P9.
No call tone in called station
● Check the cable connection to the corresponding station number.
Terminal no.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Station no.
1 2 3 4 5 6
7
8
9 10 11 12
● Check that the voltage across Z2 is 30 V when called.
●
The oscillator in the called station may be defective.
-
Replace the station with one that is working.
L
Stations used in hazardous areas do not have a call tone oscillator.
