2070-6A Manual
11
2070-6Asm v2 Standard Manual A00886-A.doc
average technician with limited
experience with this modem. On the
other hand this modem is constructed
with top quality parts reducing the
chance of a component failure.
There are numerous test points on the
board that will allow easy access to most
of the important signals in the Modem.
The isolated signals on the C2 and C20
connectors should be measured
referenced to pin “N” the isolated
ground. This includes the signals on U13
and U32
The 2070-6B is essentially two separate
in one package. There are very few parts
that are shared between the two modem
sections. The Front panel “ON/OFF”
switch and the connectors are included in
this group.
The chart below will help you find the
problem if you decide to fix the 2070-6A
yourself.
PROBLEM
CAUSE
Both sections dead
Power coming into the board or the relays could have a
problem. Check “ON/OFF” Switch or connectors and
cables. Measure power at test points
Modem is not generating
Mark and Space Freq.
No RTS or TXD coming from Top Board. Check
“Enable/Disable switch”.
Transmitter turns Off after 5
seconds
Anti-streaming is turned on and transmissions of more
that 7 seconds are being used.
No Receive Data
no LEDs
Check “Enable/Disable” Switch.
EIA-232 signals not working
in the C2 or C20 connectors
“Enable/Disable” switch not in the Disable position.
No 5V on pin “D” of C2 or
C20 connectors
Too much current being taken out of the is5V.
Keep current below 200ma.
