J. W. Davis & Company D-500A User Manual - page 4
NEW TECHNOLOGY
OLD RELIABILITY
J.W. Davis & Company
• 3030 Canton Street • P.O. Box 710219 • Dallas, Texas 75371-0219
Sales 800-527-5705 • Fax 800-388-9106 • Corp 214-651-7341 • Fax 214-939-0328 • sales@jwd.com • www.jwd.com
The Mark of the Professional...
IV. THE FRONT PANEL
V. THE BACK PANEL
1 - VOLUME CONTROL Adjusts the master volume level of
output for the amplifier.
2 - CIRCUIT BREAKER Pushing this plunger resets the
circuit breaker should the breaker trip. The circuit may
need to be resetfor two reason: 1) The amplifier is
continuously being overloaded, 2) The internal temperature
surpasses the safe operating range. NOTE: Before
resetting the circuit, be sure to first correct the problem
causing the overload or overheating.
4 - POWER SWITCH This switch turns the unit on or off.
5 - POWER INDICATOR This green LED will light when
the power is switched on.
3 - OVERLOAD INDICATOR This redLED will light/flash
at full power and on peaks. A steady bright glow could
indicate a shorted speaker line, too much load, or oscillation
in the system.
6 - AC LINE CORD Three conductor line cord for AC
supply voltage.
5 - AC CONVENIENCE OUTLET Grounded outlet to
run additional equipment (2 amp maximum).
2 - INPUT/PATCH These are two high impedance inputs connect-
ed in parallel. One is for signal input, the other for bridging to a
second amplifier that will allow increasing the power to the entire
system.
3 - INPUT TERMINAL SCREW STRIP This strip is designed
to accept either a 600 ohm bal-
anced input or a Tel-Page balanced
input. These inputs, differing only in
sensitivity, are designed for wide
acceptance without the need for
any accessories. It is recommend-
ed to use ground reference on the
input whenever and wherever possible.
1 - OUTPUT TERMINAL SCREW STRIP Four outputs are
provided on this strip; the voice
coil output for 4 ohm and 8
ohm speaker loads, and the
25V and 70.7V speaker line
outputs.
-4-
4 - 600 OHM/TEL-PAGE INPUT GAIN CONTROL This
recessed control adjusts the level of the 600 ohm Tel-
Page input
without effect-
ing the
level of
the high imped-
ance input. It is
factory preset at 0. This input will mute the Hi-Z inputs
automatically. To defeat this feature see “Part VIII. The
Auto-Mute Circuit” on page 6.
4
Ω
8
Ω
C
25V
1.25
Ω
Min
70V
10
Ω
Min
1
2
3
4
5
6