WordClock-4 Assembly Guide 05/15/21 Version 0.8
Page 4
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Install one or two TaylorEdge 1363 high voltage power supplies with the coils facing the
word, “COIL” on the board. If only one power supply is used, connect a jumper between
HVJP1 and HVJP2.
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There is no load balancing facility available so do not connect this jumper if two
power supplies are used
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Connect the 12V power supply. Both neon bulbs should now be lit. Check one or both
+170V test points for approxi170V.
If the voltages check out and the neon bulbs are lit, remove the power supplies and the
ENABLE jumper.
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Install the components on the bottom of the board, starting with the surface mount
resistors. Note that each “00” series is the same value, for ease of assembly.
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Install the surface capacitors, followed by the ICs. The line or dot on one side of each
chip must be installed toward the cutout on one side of the silkscreened pattern. The
best way to install a surface mount chip is to add a very small amount of solder to one
of the corner pads on the board. Then quickly and carefully solder the corresponding pin
to the pad. Check the alignment of all pins and if correct, solder the opposite corner pin.
Check the alignment again, then solder the remaining pins quickly and carefully. Always
use a magnifier to check for solder bridges and bad solder joints. The HV5530s are very
difficult to solder successfully and must be checked with magnification to ensure that
each pin is soldered, and that there are no solder bridges. Use solder braid to easily
remove solder bridges.
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Install the SD card connector next. Be sure to solder all leads to the board. Solder quickly
and carefully. The plastic chassis can easily be damaged by too much heat. Several pins
on one side of the connector are very close to the grounded case. They do not need to
be soldered. Then install J3, the GPS connector.
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Install all of the remaining parts on the top of the board. Note that the APA102 RGB LEDs
must be installed with the cutout facing the dot on the board.
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The ambient light sensor, Q2, should be installed about 10mm above the board. The
shorter lead goes toward the back of the board.
