4
D-20V Gooseneck VOX Microphone Change
The D-20V, 6-station, (model 445) intercom, original
dynamic
, gooseneck, VOX, mic (78-8050-8485-7)
will be replaced with a 16”
electret
, gooseneck, VOX, mic (78-8095-0839-9). This electret mic is the
same one used on C5000 and Performance Series intercoms. This mic change will begin approximately
May 2003. No changes will be made to the circuit boards. The D-120V, 12-station intercom mic will
remain unchanged at this time.
If an original
dynamic
, gooseneck, VOX, mic (78-8050-8485-7) needs to be replaced, order a
(Microphone, Flexible, without switch, 78-8010-4847-7). You will need to re-use the original VOX mic
base flange.
D-15, D-20, D-120, 18-terminal Connection Cable
The 9-pair, 18-conductor cable, supplied with the Classic Series intercoms was changed in 1996 to
provide improved shielding. The current part number is 78-8095-0213-7. The original cable (78-8050-
8524-4), which still appears in the older parts manuals, was discontinued in 1996.
D-120, 16.5 VAC Power Transformer is Obsolete
D-120 and D-120V intercoms produced after March 2000 require a 14VAC, 2.88Amp, power supply
transformer. The 16.5VAC, 40 VA power supply transformer (78-6911-2383-6) is not compatible with
the current D120 and D-120V 12-station intercom. These intercoms require a 14VAC power supply
ONLY
. The 14VAC power supply is backwards compatible with all D-120 intercoms and has the same
part number as the 16.5VAC power supply. Please check you spare parts stock and remove any 16.5VAC
power supplies.
The current 14VAC power supply transformer does not have the wire colors marked on the terminals.
The Black wire from the D-120 connects to the transformer GND terminal. The Red and White wires
from the D-120 connect to either AC terminal.
Symptoms of a current D120 16-station intercom powered by an obsolete 16.5VAC power supply are:
”ALL CALL” works fine, but when an individual station is selected, there is no audio.
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