Crown PSA-2 - Review Section; Introduction; Warranty Information; PSA-2 Specifications

crown
REVIEW SECTION
I. Introduction
This manual contains complete service information on
the Crown PSA-2/SA2/PSA-2D/PSA-2DX/ PSA-2X
amplifiers. It is designed to be used in conjunction with
the PSA-2/SA2 Instruction Manual. However, some
important information is duplicated in this Service
Manual in case the Instruction Manuals are not readily
available.
NOT THE INFORMATION IN THIS MANUAL
IS INTENDED FOR USE BY AN EXPERIENCED
TECHNICIAN ONLY!
II.
As a Crown Warranty Service Station, you should be
familiar with Crown warranty policies. Each Instruction
Manual contains basic policies as related to the customer.
However, under questionable circumstances, please
contact the Technical Service Department or Director of
Customer Service at: Crown International, Inc., 1718
W. Mishawaka Road, Elkhart, IN 46514.
Warranty
Hl.
General Protection: Protection circuitry limits the
output level to protect the output transistor stage, even in
the case of elevated temperature. Transformer
overheating results in shutdown (STANDBY) of that
particular channel. Controlled slewing rate voltage
amplifiers protect the unit against RF burnouts. Input
overload protection is furnished by a resistor at the input
of the amplifier to limit current.
PSA-2 Specifications
DC Output Offset: (Shorted input) +10 millivolts.
Phase Response: +0, -15 degrees DC-20KHz at I watt.
Input Impedance: (XLR balanced) 20K ohms.
(phone jack unbalanced) 25K ohms +30%.
High Voltage Power Supply: Two 800VA transformers
with computer grade capacitors powered through 10A
relays.
Low Voltage Power Supply: +15V DC supplies are
provided by a current limited shortproof regulator.
Power Requirements: 50-60Hz AC with adjustable taps
for 100, 120, 200, 220, and 240 +10% operation. Draws 90
watts or less on idle 800W at 250W channel output into 8
ohms.
Turn On: May be switch selected for instantaneous or
four second delay after applying power. No dangerous
transients.
Low Frequency Load Protect.: May be switch selected to
produce shutdown (STANDBY) of high voltage power
supply for DC outputs greater than 26V or low frequency
outputs greater than 26V at 5Hz (see Graph RVW.15).
Controls: Two position ON/OFF rotary switch.
Ch. | and Ch, 2 input level controls.
The LOW FREQ PROTECT, DELAY and STEREO/
MONO slide switches are located on the rear panel.
Displays: A yellow LED indicates STANDBY mode
activated for that respective channel.
A pair of green LED's indicate SIGNAL presence at the
output of that respective channel.
A pair of red LED's (IOC) indicate amplifier
OVERLOAD conditions for that respective channel.
An amber LED POWER indicator driven by low power
control supply.
Connectors: Unbalanced Input - 4” phone jacks.
Output-color coded dual binding posts on standard %4”
centers; spaced %” apart for mono (balanced) output
connection.
AC Line - Three wire 20A, 120V male connector with 5 ft.
cable.
Ground Selectivity - 2 lug terminal block with removable
shorting strap.
Module Plug-ins: Standard rear-panel balanced input
module (module replacement information available
upon request).