QSC PLX Series User Manual

Introduction
This manual is prepared to assist service personnel with the repair and calibration of PLX power
amplifiers
. The procedures described in this manual require advanced technical experience
and sophisticated audio test equipment.
CAUTION: To reduce the risk of electric shock,
do not remove the cover. No user-serviceable
parts inside. Refer servicing to qualified
personnel.
CAUTION
WARNING: To prevent fire or electric shock, do
not expose this equipment to rain or moisture.
Documentation
This manual contains schematics, printed circuit board (PCB) drawings, parts lists, and
mechanical assembly drawings. This information should be used in conjunction with the
test and troubleshooting guide.
The electrical and electronic components are identified by circuit identification numbers on
the schematics and the parts list. The test
& troubleshooting sections refer to
designations shown in the schematics.
Equivalent Parts
Although many of the electronic components used in this product may be available from
electronic suppliers, some components are specially tested and approved by
WC. A
product repaired with non-WC supplied components may not meet factory specifications.
Repairs performed using non-QSC parts may void the product warranty. men in doubt,
you may contact QSC Technical Services for assistance.
Parts orders to QSC should include the product model number, the part description, and
the QSC part number (from the parts list in this manual). Parts will be shipped via UPS,
F.O.B. Costa Mesa, California. Shipping, handling and COD charges may be added to
the cost of the parts.
Factory Repair
It may become necessary to return a product to the factory for repair. Call QSC Technical
Services for return instructions. QSC Technical Services may be reached at (800)
772-2834.
Test and Troubleshooting Equipment
- Distortion Analyzer capable of 0.01% THD+N
- High Power Load Bank (8,4,8 2 ohms)
- Function Generator 8 Digital Multimeter
- 2OMHz Oscilloscope
- Variac (0-140 VAC, 30-40A)
-Audio Precision - System One
+ Thermometer
2

QSC PLX Series Specifications

General

Channels	2
Series	PLX
Frequency Response	20Hz - 20kHz
Total Harmonic Distortion	<0.02%
Signal to Noise Ratio	>105 dB
Input Impedance	20k ohms balanced, 10k ohms unbalanced
Cooling	Variable speed fan
Connectors	Input: XLR; Output: Binding posts, Speakon
Height	3.5" (2U)
Weight	28 lbs (12.7 kg)