Ramsey Electronics BS2C Bedienerhandbuch PDF herunterladen (Seite 28)

DCI2 • 30

TROUBLESHOOTING GUIDE

If your DCI2C does not work at all, recheck the following:

• correct orientation of U1 and U3 (see PC board Parts Layout Diagram)

• correct polarity of all electrolytic capacitors.

• correct orientation of all diodes (especially D1).

• all solder connections

• jumper wires at all JMP locations.

• Have another set of eyes look over your work. Here at the shop we have

often run into a “stone wall” on a problem only to have a fellow technician

see our obvious error. It is sometimes very difficult to see your own

mistakes

Still having trouble?

While we had hoped that it wouldn’t come to this, if you are still having trouble

with your DCI2, here are a few additional suggestions.

PROBLEM:

The Power LED (D9) doesn’t light and VR1 gets very hot quickly.

SOLUTION:

You likely have a short across the power supply or you have a

component placed in the incorrect orientation. Check all of your parts to make

sure they correlate with those on the Parts Layout Diagram.

PROBLEM:

The Power LED (D9) doesn’t light and VR1 remains cool.

SOLUTION: Using an oscilloscope or a frequency counter to verify that there

is a 3.579 MHz signal on pin 7 of U3 and pin 3 of U1. It should be

approximately 0.5 Vp-p or greater. If you cannot check the oscillator, verify

that 5 Volts DC is present on the IC power pins (U1:5 and U3:18). If not, check

VR1 for 5 VDC output with at least 12 VDC input from your power supply.

PROBLEM:

It seems to be missing key entries when I try to enter commands.

SOLUTION:

Wait until after the confirmation tones have stopped before enter-

ing new commands.

PROBLEM:

My answering machine hangs up before I finish my commands.

SOLUTION: Some answering machines will hang up automatically if they do

not sense any voice activity. Try talking into the phone at the same time to

provide the needed audio for it to hold the line. Example: Say “relay #1 ON” at

the same time you are typing the commands. Some answering machines may

not be compatible.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 34

Keine Kommentare

Ramsey Electronics BS2C Bedienerhandbuch Seite 28