11. CONNECTIVITY DIAGRAM FOR TROUBLESHOOTING
Please refer to the diagram on the next page. If you have problems with
missing digits from the display or no digits displaying at all (even though
High voltage is present and the clock makes bleeps when pressing the
'SET' Button) then you should check all connections to the HV5812 IC
using the chart below.
Set your meter to continuity setting. This is the setting where it bleeps
when you touch the two probes together.
11.1 Data connections from IC2 to IC3
IC3 (HV5812)
Pin Number
IC2 (PIC 16F1936)
Pin Number
Function
27 3 Data
15 4 Clock
16 5 Strobe
11.2 Cathode connections from IC3 to tube pin headers
IC3 (HV5812)
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