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Solder shorts between components. Check your schematic and parts
layout diagrams if you suspect a fault.
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Proper orientation of diodes, capacitors, and ICs.
•
Ensure proper power supply polarity and voltage (5 to 12 volts DC, center
positive)
All finished checking your kit over? I went and got a glass of water to give you
time to thoroughly examine your solder joints and parts placement, knowing
that you wouldn't want to leave me sitting here idly waiting for you. Now that
we're both back, let's attach the boards together and test this baby out!
66. Locate the bottom half of your clamshell case; it's the one with the
mounting posts for your board screws in it. While you're at it, find a couple
of the short Phillips head screws and the prepunched front panel. Since
we're talking about the front panel, take a look at yours now. You'll see a
place labeled "Input Level". That label should be under the large
potentiometer labeled "Volume". Yes, we goofed. The volume is actually
controlled by the UP/DOWN buttons, and the pot is for adjusting the line
level input if you need to. Sorry for any confusion. Now, back to what we
were doing. Place the front panel into either end of the clamshell case,
sliding it into the slots provided; it doesn't matter which end it goes into.
Put that aside for a second; we'll get back to it.
67. Take the main PC board and line the smaller front panel board up to
the main board so that the dual header pins can be soldered to the
corresponding pads on the main board. All lined up? Good! Don't grab
your soldering iron yet, though. We're going to be sure that the front panel
PC board fits up against the kit's front panel before permanently attaching
the boards together. When they've been soldered together they'll want to
stay that way, meaning that it's a bear to get them apart again. We'll try to
do this right the first time!
68. Once the boards are lined up and together, place the combined but
not yet soldered boards into the bottom of the case. To do this you'll slide
the front panel components through the front panel and then line the main
board up with the screw holes in the bottom of the case. Don't worry if the
front panel isn't lined up perfectly yet; that's what we're tweaking right
now. Use the two screws you located earlier to attach the main board to
the case so that you know how it's going to line up. It's best to use a
couple of screws kitty-corner from each other. You simply have to have
the board in place, you don't have to tighten the screws down tightly.
69. Now that the board is temporarily screwed into place, take the front
panel board that hasn't been soldered to the main board yet and pull it
forward to where you want it to line up with the front panel. You'll want
the buttons and LEDs to poke out and look good, and you'll want things to
BS2 • 19
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