Protech Audio 5126 - Manual (Page 2)

OUTPUT SECTION A
OUTPUT SECTION B
OUTPUT CONTROLS
SECTION B
OUTPUT CONTROLS
SECTION A
POWER ON
INDICATOR
OUTPUT SECTION A OUTPUT SECTION B
POWER
SUPPLY
REAR VIEW
FRONT VIEW
INSTALLATION
The Toolbox Series Audio Distribution Amplifiers from
Protech Audio are designed to be mounted in a standard 19
inch wide EIA rack. Each of the four models requires 1.75
inches of vertical rack space. The steps for installing
the units are as follows;
If the installation requires that some or all outputs do not need
the signal from both inputs 1 & 2, remove the 8 cover screws and
move the jumpers to the appropriate position (See page 4).
Mount unit in rack, using four machine screws of sufficient
tensile strength to support unit properly.
Terminate all audio inputs and outputs, using double conductor
shielded cable, as shown on facing page. The diagram on the
facing page shows balanced line configurations. For unbal-
anced lines terminate line HI to DA HI, and line LO to DA SH
connection;
Page 2 12/92
TOOLBOX SERIES
PROTECH AUDIO ®
MODELS 5126, 5226, 5126T, 5226T
CONNECTOR & LAYOUT DRAWING
The wall mount power transformer plugs into the rear power
connector marked 16VAC. Plug transformer jack into chassis
connector first. Then plug wall transformer into three prong AC
outlet.
OFF
ON
GROUND
LIFT
1 AMP
SLO-BLO
20 VAC
Make sure ground lift switch is in the on position.
Check front panel power indicator (green LED) for proper
illumination.
ALIGNMENT
All four models have been shipped from the factory adjusted
for unity gain. Input 1 is adjustable from -15 to +15dB of
gain. Input 2 is adjustable from 0 to 15dB of gain, and serves
as a reference level for unity gain, when turned completely
down.
CAUTION: DO NOT USE THE 20dB OF GAIN IN THE
OUTPUT STAGES UNTIL THE GAIN IN THE INPUT
STAGE IS COMPLETELY EXHAUSTED. DOING SO WILL
RESULT IN REDUCED SIGNAL - TO NOISE RATION.
Each output trimpot is individually adjustable from infinity
(completely off) to 20dB of gain. The output gain trimpot
should not be used to adjust the output setting until the gain
at the inputs has been exhausted.
Adjusting the individual output gain trimpot will not effect
the any other output level setting.
LO HI
3 4 5 6 2 1
OUTPUTS
SH LO HI LO HI SH LO HI LO HI SH LO HI LO HI SH LO HI
LO HI
3 4 5 6 2 1
OUTPUTS
SH LO HI LO HI SH LO HI LO HI SH LO HI LO HI SH LO HI
INPUTS
2 1
INPUTS
1 2
SH
LO
HI
UNBALANCED INPUT
CONNECTION
SH
LO
HI
BALANCED INPUT
CONNECTION
SH
LO
HI
UNBALANCED OUTPUT
CONNECTION (Electronic)
SH
LO
HI
BALANCED OUTPUT
CONNECTION
SH
LO
HI
UNBALANCED OUTPUT
CONNECTION (Transformer)