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5
telephone
line. If a coupler is required, make certain the
coupler
selected
and the wiring arrangement are in com
-
pliance
with the telephone company regulations.
When direct connection to a telephone line is not pos-
sible, acoustic coupling to a telephone handset may be
used.
A Shure Model 50AC T
elephone Acoustic Coupler
can
be connected to the 600
, line
or headphone output
of
the M267 and attached to most telephone handsets.
T
elephone Line Surge Protection
When
using the M267 connected directly to a telephone
line subject to lightning-induced voltage surges, the fol-
lowing
commercially available part can be installed across
the LINE OUT terminals to provide additional protection
for
output circuit components:
Metal Oxide Varistor, General Electric Co., Type No.
V22ZA1
ACCESSORIES
A268R
Rack Panel Kit.
The Model A268R
Rack Panel Kit
includes
a 19 in. x 3-
1
/
2
in. (483 mm x 89 mm) precut rack
panel and necessary hardware for rack-mounting the
M267
(with its cover in place and end caps
removed) in a
standard
19 in. (483 mm) rack panel.
RKC169 Rack Panel Bracket Kit. The Model RKC169
Rack Panel Bracket Kit enables owners of the Shure
A68R
Rack Panel Kit (originally designed for the M67 and
M68
Mixers) to rack-mount the M267 with the A68R.
SERVICE
WARNING
V
oltages in this equpment are harzardous!
Refer servicing to qualified service personnel.
240 V
ac Operation
To
change the M267 operating voltage from
120 V
ac to
240
V
ac, follow these steps:
1.
Disconnect the M267 from the ac line.
2.
Remove the end caps and cover
.
3. Locate
the voltage selector switch (S201) at the
right
rear
of the main printed circuit
board (Figure 3). Move
SD201
to the 240V position (toward the front panel).
T206
WHT
BLK
120V
240V
F201
F202
T50/250V
240
V WIRING
FIGURE 3
S201
4. Remove
fuse F201 (0.1A,
250V
, time lag) and replace
it
with the supplied fuse F202 (0.05A, 250V
, time lag).
Note
that the F202 fuse holder is at right angles to the
F201
fuse holder
.
5. Replace the ac line cord (if necessary) with one de-
signed for the 240 Vac source. If the M267 is to be
used outside the U.S. and Canada, local regulations
may require replacing the line cord with one having
wire
insulation colors as follows:
“Live” or
“Hot” Neutral
Earth or
Ground
U.S., Canada
Black White Green
Europe Brown Blue Green/
Yellow
6. Replace the cover and end caps, and mark the rear
panel
to reflect the new operating voltage.