Ramsey Electronics MX-5, Assembly And Instruction Manual

Page: 13 / 22

MX-5 Page 13
ˆ 47. Install J3, another RCA jack.
ˆ 48. Install J5, the last of the RCA jacks.
ˆ 49. Install J7, the 2.1mm power jack.
ˆ 50. Install S1, the DPDT switch. Make sure the part is flush to the board
before soldering.
ˆ 51. Install the battery power clip. Make sure the red wire is installed in the
hole marked (+), and the black wire is installed in the hole marked (-).
ˆ 52. Using a piece of scrap component lead, mount the battery holder to
the PC board under where the battery is to go. Note the two holes
provided for this task.
Now we are going to flip the PC board over and install the remaining controls.
Make sure and follow the steps closely from here on out. Mounting parts on
this side of the board is not conventional, but it is necessary for assembly
purposes.
ˆ
53. First things first. If we were to try and install the slider pots without
what we are going to do next, you would be very frustrated when you
discover that you would have to desolder the sliders out, then put these
back in. If you look at the Control Side Layout diagram, you will see under
each of the sliders that there are jumpers, each end marked with a circle.
We will be installing these jumpers, but only soldering the end with the
circle into place before installing the sliders. The center leads of the
sliders will be sharing the larger of the two holes, so you don’t want to clog
the hole with solder yet.
ˆ 54. Install the two jumpers for R6 as shown using scrap component leads.
Make sure not to solder the uncircled end yet. Make sure the jumper is
mounted flat to the board so that it doesn’t have the possibility of shorting
out the underside of the slider.
ˆ 55. Install two more jumpers for R13 as shown. Use the same procedure
as in the previous step.
ˆ 56. Install the last two jumpers for R3 as shown. Again make sure you do
not solder the circled ends of the slider.
ˆ 57. Install R6, the 10K ohm MAIN slider pot. Notice how you will be
soldering on the same side of the board where the part is mounted. Make
sure all the slider’s pins are through the board before soldering. This may
be a little tricky, so it is best to use a fine tip soldering iron to make the job
go smoothly. Make sure and solder all four mounting lugs as well as the
two pairs of connections on each end. Then flip the board over and solder