Instructions for, Limited warranty – Hafler DH-500 User Manual

Page 21

INSTRUCTIONS FOR

THE HAFLER DH-502 AMPLIFIER BRIDGING KIT

FOR THE DH-500

The DH-502 Amplifier Bridging Kit for the DH-500 consists

of a PC-7A circuit board comprising a 6 transistor phase inverting
amplifler, a mounting bracket, necessary hardwareandconnecting

wire. Installation may take about an hour. All changes to the

amplifier wiring are performed on the right channel - the side
nearest the power switch. Only the left channel input will be utilized

after conversion so an additional pair of input wires will be
connected to that jack to enabie it to feed the complete amplifier.

When converted to monophonic operation, the loudspeaker

load is t o be connected to the t w o centerred (+) outputs only. The
right (+) will act as the common and should be attached to the
speaker (-)_ This is what is known as a floating output, for no

connection is made to either black ground terminal. It is sug-
gested that once the amplifier has been converted, some clear

indication be made as to the appropriate connections, and that be

attched to the back panel. Because of this floating output, neither
side of the output signal may be grounded; such as thru a speaker
switching box or head phone adapter that has a common ground
between the left and right channels.

For equivalent load impedances, the speaker fuses provide the

same power output protection as in stereo operation, but because
of individual

fuse variations,

only one fuse may blow at these

levels. It is best to replace both fuses if one blows, as the other
may have been weakened.

These installation instructions designate connections in ac-

cordance with the DH-500 owner’s manual and pictorial diagram,
and use the same terminology (i.e. “S” indicates a soldcrcd
connection),

KIT PARTS LIST

PC-7 Board

WP-PC7

1 M

ounting bracket

SM-BRT202*

Screw, Machine, 4-40 x 5/16”

HWH-145

2 Nut. 4-40 KEP

HWH-105

Wire Red #20 GA 3.0’

Wire, Green #20 GA

3.0’

Warranty

Card

LIT-WAR

T O

LIMITED WARRANTY

The parts

in the

DH-502 are

warranteed for a full year from the purchasedateincluding

parts

and labor. If a defective componcnr is found on a circuit board

or in the kit, simply return

the individual

part, or if the problem is unknown, retumthedefcctive board to

the

factory,

prepaid, together with the serial number

and a

copy of the

dated bill of sale, and it wil be repaired or replaced at no charge. This warranty is limited to repair or replacement of the DH-502 bridging

module only. Hafler is not responsible for consequential damages. This warranty gives you specific legal rights. You may also have other rights which
vary from state lo state.

This warranty is void if acid core solder or paste flux has been used.

A Division Of Rockford Corporation

613 S. Rockford Drive, Tempe, Arizona 85281

(602) 967-3565