Operation; Pitch Control - Valcom V-9924C User Manual

TO REMO VE CO VER
LOOSEN SCREW ,
THE N AC TIVATE L ATC H

OPERATION

Figure 3 shows a V-9924C simplified schematic.
When the V-9924C is idle, 1T IN is shorted to 1T
OUT, 1R IN is shorted to 1R OUT, 2T IN is
shorted to 2T OUT, 2R IN is shorted to 2R OUT,
3T IN is shorted to 3T OUT and 3R IN is shorted
to 3R OUT.
A signal appearing at the T IN, R IN terminals
will also appear at the T OUT, R OUT terminals
for each zone.
Signaling
When ringing or buzzer voltage appears at the
signaling input leads of the V-9924C or UNA
closure pins are connected, relays are
energized and the 1T OUT, 1R OUT, 2T OUT,
2R OUT, 3T OUT, and 3R OUT leads are
switched to the outputs of three 5 Watt
amplifiers (one for each zone). At the same
time, the electronic warble tone is connected to
the input of each of the amplifiers and the warble
signal (which follows the interrupted ringing
pattern) is broadcast to all of the speakers.
Each zone has its own volume control so the
volume can be set to a comfortable level.
WIREW AY OPENING
TO W ALL PLATE AND
JUNCTIO N BOX
SNAP LATC H
CIRCUIT BO ARD
HO USING ASSEMBLY
PLASTIC
COVER
FIGURE 1A
3
WIRE TIE LOOP
WIRE TIE USED TO B UNDLE WIRES
ENTERING AND LE AVING TERMINAL ARE A
.155 DIA. HOLES FOR MOUNTING TO
METAL W ALL
SINGLE OR DO UBLE GANG JUNC TIO N BOX
MO UNTING
HOLE PATTER N M ATC HES BOTH E URO
PLATE
AND US JUNC TIO N BOXES
BRACKET
LOCKING
SCREW

Pitch Control

Dipswitches have been provided to vary the
pitch of the warble ring tone should a different
pitch be desired. Generally, this control does
not require adjustment (see Figure 2B). If
adjustment is necessary, see chart to select
desired pitch (see Figure 2A).
BIT 1
OFF
LOW
OFF
MED
H I ON
*DEFAULT ON
FIGURE 2A
1.5 x 2 W IRE ACCESS OPENING
TO JUNC TIO N BOX
SNAP LATC H
FOR COVER
BIT 2
OFF
ON
OFF
ON
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