Specifications
are the two terminals on the opposite side of the jack body
from
RlOl and R104.] Wiring can be made at the top
[component] side of the board, or to the foil side
after
the
bottom
plate is removed. Note that the jumper should be
run
around
the area that will be covered by the bottom
plate to assure proper bottom plate fitting. Replace the bot-
tom
plate after wiring. Note that a similar effect is obtained
by plugging a stereo phone plug with the tip and ring shorted
into the Direct Out jack; this must be done if the modified
Direct Out jack is to be used as a standard Direct Out jack.
24-Volt Relays
To use the AMS Gate Out logic terminal to drive 24-volt
relays for loudspeaker muting, each channel must be
modified as follows:
1
.
Remove the top cover and Channel board to be modified
as described above.
2.
Unsolder and remove diode Dl 13.
3. Reassemble the
Channel board and top cover as
described above.
4. To prevent circuit damage caused by inductive
"kickback" when the relay is de-energized, make cer-
tain a diode is
placed across the relay coil as shown in
Figure 13.
AMS4000: Input Expansion
Model AMS4000 mixers, supplied with four input channels,
can be expanded to accommodate up to eight AMS
microphones through the
installation of additional Channel
boards [RKCI
88;
order one for each additional channel] and
a nine-connector cable
[RKCI 89; one cable provides for up
to eight inputs].
1.
Remove the top cover as described above.
2. Remove the five-connector
cable between the Channel
boards, and remove the blank rear
plate of each channel
to be added.
3.
Using the
template supplied with the Channel board, drill
the front-panel nameplate holes for the LED [0.254"
&0.005"] and Channel Level control [0.296"
&0.005"] for each channel to be added. [NOTE: It is
not necessary to
drill the front panel for the rectangular
locator pin.]
4. lnsert the new
Channel board from the rear, making
sure the rectangular locator pin is properly centered in
its mounting hole.
5.
Use the supplied nut and washer to secure the level con-
trol to the front panel.
6. Secure the new Channel board bottom plate with the
screw previously removed.
7.
lnsert the new Channel-On LED through the front panel
[leads first] and use a 3/16" nut driver against the
bezel to secure the LED flush with the front
panel. At-
tach the white and red LED leads to the marked ter-
minals at the upper front of the new Channel board.
8.
Attach the new nine-connector cable to the Master and
all Channel boards [unused channels will have unused
connectors].
9.
Attach the new Channel
Level control knob and replace
the cover.
CHANNEL BOARD Al: X107, R101, R104,
"2"
FIGURE 29