HARBACH ELECTRONICS PM-200 Manuale utente
PM-200 POWER SUPPLY MODULE INSTALLATION INSTRUCTIONS
PARTS SUPPLIED WITH THIS KIT:
(1) PM-200 Power Supply Module Circuit Board (1) 3.6kΩ¼-Watt Resistor
(8) 1N5408 Diodes (1) 1Ω3-Watt Resistor
(14) 1MΩ¼-Watt Resistors (12) 82kΩ3-Watt Resistors
(6) 180μF 450VDC Electrolytic Capacitors (1) 910Ω2-Watt Resistor
(1) 15KΩ ½-Watt Resistor (1) #20 5" Small Blue Wire
To start the installation, read these instructions very carefully. Unplug the amplifier and remove any
input, output and control cables that may be connected to the back of the amplifier. Remove the
chassis from the case and remove the perforated sheet metal RF shield from the top of the chassis.
Remove the tubes and place them in a safe place. You are now ready to proceed with the
installation.
( ) Assemble the PM-200 Power Module according to the parts layout diagram. Make sure
resistors R1A-R6B are mounted approximately ¼” above the PC board. All other components
are mounted flush to the PC board. In addition, solder one end of the 5” #20 BLUE wire to the
underside of the PC board at pad “V”.
( ) Place the amplifier on its side (transformer down). Unsolder all wires connected to the power
supply circuit board. These are the RED and RED & YELLOW transformer wires on the top
side of the circuit board, a GRAY wire and a YELLOW wire from the top side of the board
(these wires pass through the hole in the circuit board), the (3) 4.7MΩresistor assembly on
the bottom of the circuit board and the heavy BLUE HV wire on the bottom side of the board.
( ) Remove the fixed end of the (3) 4.7MΩ resistor assembly from the terminal strip lug and
discard these resistors.
( ) Remove the (9) #6-32x3/8” screws, washers and nuts that secure the circuit board in place.
Save this hardware.
( ) Place the amplifier right side up and remove the 5 control knobs from their shafts.
( ) Remove the 3 nuts and washers that secure the bandswitch, meter switch and sensitivity
potentiometer and save them.
( ) Remove the (4) #6-32x3/8” Phillips-head screws, washers and nuts that secure the front
panel. Save this hardware.
( ) Gently tilt the front panel forward. You may have to carefully pry it loose with a small
screwdriver because the paint from the front panel may stick to the chassis. Place the front
panel down in front of the chassis.
( ) Lift the circuit board from the front so that it tilts upward about 1”.
( ) Using diagonal cutters, cut the old circuit board from the front left corner all the way back to
the wire hole. This will break out a path for the wires to exit. Be careful not to cut any wires
during this process. This will free the old circuit board so that is can be removed without
further unsoldering of wires.
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( ) Carefully work the old circuit board out of the compartment and discard it.
( ) Take the new circuit board and work it into position with the wires passing through the slot in
the board.
( ) Secure the board on the right side with 2 or 3 of the #6-32x3/8” screws, washers and nuts.
Tighten enough to hold the board. They will be adjusted later.
( ) Reinstall the YELLOW and GRAY wires in their marked holes in the circuit board and solder.
( ) Swing the front panel back into position and reinstall the (4) #6-32x3/8” Phillips-head screws,
washers and nuts.
( ) Reinstall the 3 control flat washers and nuts and tighten.
( ) With the amplifier on its side (transformer down), install the remaining #6-32x3/8” screws,
washers and nuts holding the circuit board in place. Tighten all screws. You will have one
screw left over.
( ) Put the RED and RED & YELLOW transformer wires through their appropriate holes in the
circuit board and solder.
( ) Place the amplifier upside down.
( ) Locate the 2-lug terminal strip just to the rear of the new circuit board. Remove the 15KΩ
resistor and clean the holes in the terminal strip lugs. Note: There is still a blue wire
connected to the insulated terminal lug.
( ) Connect the 5” #20 BLUE wire connected to hole “V” on the circuit board to the insulated lug
of the terminal strip. DO NOT solder yet.
( ) Connect the supplied 15KΩ ½-watt resistor between the 2 lugs of the terminal strip. Solder all
connections (See pictorial).
( ) Solder the heavy BLUE HV wire to the circle pad marked “H” on the underside of the circuit
board.
( ) Carefully inspect all work. Replace the front panel knobs (make sure they are properly aligned
with the front panel markings).
( ) Reinstall the tubes and the perforated sheet metal RF shield on the top of the chassis and put
the chassis back into the case.
This completes the installation of the PM-200 power supply module. It will provide you with a better
power supply that provides the necessary B+ filtering and regulation. Your amplifier should not
experience any power supply problems in the future.
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PC BOARD PARTS DESIGNATION:
C1-C6 180μF 450VDC Electrolytic Capacitors R8 3.6kΩ¼-Watt Resistor
D1-D8 1N5408 Diodes R9 1Ω3-Watt Resistor
R1A-R6B 82kΩ3-Watt Resistors R11-R24 1MΩ¼-Watt Resistors
R7 910Ω2-Watt Resistor
HARBACH ELECTRONICS, LLC
Jeff Weinberg – W8CQ
468 County Road 620
Polk, OH 44866-9711
(419) 945-2359
http://www.harbachelectronics.com
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