WordClock-4 Assembly Guide 05/15/21 Version 0.8
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Step 1 – Build the Main Board (6-Tube Board Shown For Reference)
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Install the female pin sockets on top of the board. Use masking tape to hold them in
place while soldering on the bottom of the board.
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Cut the single row 40 pin female header into two, 17 pin pieces. Install at the U4 location.
Install two, 2x6 female headers at the HVPS1 and HVPS2 locations.
DO NOT solder the microcontroller to the board!
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Build the 5v supply on the main board. Install J1, F1, C1, C2, C3, D1, D2, L1, and U1.
Note that C1, C2, D1, and D2 must be installed in the direction noted on the board.
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Connect a 12V-18V power supply with a center positive, 2.1mm connector to J1, and
check the test point for 5V. Do not continue assembly if 5V is not present at the test point.
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Build the high voltage supplies. Install R1, R2, R6, R7, R33, R34, NE8, and NE8.
Connect a temporary jumper between ENABLE and +5V. This will turn on the high
voltage power supplies.
Do not install the microcontroller while the jumper is in
place or while testing the power supplies, or the microcontroller will be damaged!