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Install the Tone Volume PCB:
1. Install the 1.75” tall standoffs (qty 2) that support the back edge of the Tone
Volume PCB by screwing them into the threaded studs on the chassis. Don’t over-
tighten the standoffs or you will strip the fasteners out of the chassis. Note that the
front two fasteners in the chassis are reserved for future options.
2. Remove and reserve the nuts and washers from the associated rotary controls on
the Tone Volume PCB.
3. Dress the Tone Volume board power connections along the floor of the chassis,
between the standoffs for the input selector board and the tone volume board.
4. Insert the potentiometer shafts fully through the front panel and fit the mounting
holes at the back of the Tone Volume PCB over the screws in the 1.75” standoffs.
You may have to slightly deflect the standoffs to line them up with the holes.
5. Fasten the board in place with 2 4-40x1/4” nuts.
6. Fasten the controls in place using the nuts and washers from step 2. The nuts may
have slightly different outside diameters. If so, use the larger outside diameter
nuts with the balance and volume controls.
Test the Tone Volume PCB Step 1
Here is the input selector test procedure:
1. Connect the IEC power cord to the PR102 and the AC mains (wall socket).
2. Switch on the AC power.
3. Measure the DC voltages on J2 of the Tone Volume board.
a. It should be +12V plus or minus 0.5 V between the POS12 and GND
terminals
b. It should be -12V plus or minus 0.5 V between the NEG12 and GND
terminals
4. Remove the IEC power cord.
Warning: do not go any further until this test is passed. If you’re having trouble, please
for troubleshooting advice.
Test the Tone Volume PCB Step 2
Figure 48-Showing 14 pin Ribbon Cable Installation and Orientation
9
9
This picture shows a previous version of the tone volume board. However, the ribbon orientation is the
same in both previous and current versions.
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