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Section 7: Assembling the Tone-Volume-Balance Board
{Note: The Tone volume balance board for the PR-101NR is loaded differently than the
same board when built for the PR-101. Those differences are noted here in these
instructions}
This section details the process of building the Tone-Volume-Balance circuit board.
Carefully empty the contents of the envelope marked “PR-101 Tone Volume” into a
broad soup bowl.
Figure 35-Silkscreen side of the Tone Volume Board shows component locations
Install the Resistors
As we said before, you install the resistors by placing the body on the silk screen side of
the board, and the leads through the indicated holes. Bend the leads over on the back of
the board to keep the resistors snugly against the board until you solder them in place.
Try to bend the leads in a direction that won’t lead to solder bridges between traces that
should remain disconnected.
We recommend the following procedure:
1. Identify the group of (like valued) resistors that you plan to install. You’ll find
that resistors of the same value are often (but not always) collected together with
tape on both ends.
2. I recommend cutting the leads near the tape, then bending them in the lead
bending jig.
3. Insert the resistors into their correct places. If you’ve used a lead bending jig, you
may find that you need to do very little additional bending to retain the resistors in
their place.
4. Flip the board over onto a flat desk-top. If the stuffed PCB is flat, then all the
resistors will likely be close to the board, as they should be.
5. Solder the leads on the back of the board.
6. Clip the leads close to the solder bump, but don’t clip the solder bump.
7. Track your progress by placing a check mark in the done column as you install
each resistor.
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