Install The New Power Supply - DYNACO PWRAMP80 Assembly Manual

11. Identify the wire that connects to eyelet 1 of the front-most power amplifier
channel. Clip that wire where it connects to eyelet 1, and label it RIGHTOUT.
12. Identify the wire that connects to eyelet 1 of the rear-most power amplifier
channel. Clip that wire where it connects to eyelet 1, and label it LEFTOUT.
13. Turn the amplifier over and remove the 8 screws (2 groups of 4 screws) that hold
the heatsinks to the chassis.
14. Remove the amplifier assembly and the PC19 board.

Install the New Power Supply

Make sure that the amplifier is unplugged before proceeding
Connect the following wires to the indicated places on the new power supply board:
1. The X1 wire from the transformer to the X1 terminal of the new PCB. Insert it
from the component side and solder it on the solder side.
2. The X2 wire from the transformer to the X2 terminal of the new PCB. Insert it
from component the side and solder it on the solder side.
Connect the red/back pair on the power supply PCB as follows:
3. From C9POS (RED) wire on the PCB to the positive (RED) terminal of C9.
4. From C9NEG (BLACK) wire on the PCB to the negative (BLACK) terminal of
C9.
Connect the TOC11 labeled wire from C11:
5. The TOC11 wire from C11 to the TOC11 terminal of the new PCB. Insert on the
component side and solder on the solder side.
Ground Wire
6. For an SCA80Q. The PGND wire that goes to the front panel area to the PGND
terminal of the new PCB. Insert this wire into the component side and solder it on
the solder side.
7. If you have an SCA80 there will be no connection to the PGND eyelet. Ground
connections will be made when you install the power supply PCB into the chassis.
Fasten the power supply into the chassis as follows:
1. Re-use the chassis holes that previously mounted the PC-19.
2. The component side of the new PCB faces forward.
3. Do this step if you have an SCA80. Insert and tighten a 6-32x1/4" sems screw
from the bottom of the chassis, through the lug with the two wires that connect to
the speaker terminal commons, into the threaded PCB support bracket farthest
from the transformer, see Figure 6.
4. Do this step if you have an SCA80Q. Insert and tighten a 6-32x1/4" sems screw
from the bottom of the chassis into the threaded PCB support bracket farthest
from the transformer.
5. Insert and tighten a 6-32x1/4" sems screws from the bottom of the chassis into the
threaded PCB support bracket closest to the transformer.
6. Inspect your work to assure that there are no pinched wires or loose bits of wire
floating around inside the amplifier.
Page 15 of 36