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
1 | PC-7 Board | WP-PC7 |
1 | M ounting bracket | SM-BRT202* |
2 | Screw, Machine, 4-40 x 5/16” | HWH-145 |
2 | Nut. 4-40 KEP | HWH-105 |
1 | Wire Red #20 GA | 3.0’ |
I | Wire, Green #20 GA | 3.0’ |
1 | Warranty Card | LIT-WAR |
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
