Make sure that either: R12, R13 and D4 are replaced by wire bridges, if you are not installing the ICSP components,
or that R12 is bridged on the track side, if you do put ICSP in.
It has been noticed that the supplied radial electrolytic capacitors, C1 and C2, can make contact with the inside
of the case when the meter is assembled. It is recommended that these two components are slightly inclined towards
the centre of the PCB to avoid contact.
The correct position of the trimmer resistor, R1, is well towards one end of the travel. At initial switch on
there will be no visible display on the LCD! You must adjust this pot for best contrast.
If your meter displays 'Over Range' at switch on, regardless of the position of the C/L switch, then
the issue is with the soldering of the switch itself. Use plenty of solder to ensure a good connection between all 6
pins of the switch and the PCB
Errata
PCB Marking Legend. There is an error in the PCB legend on V2_c PCBs - the +B (TP1) and +E (TP2)
connections are reversed. For standard versions (ie without backlight) this does not matter - you can
connect the +ve side of the battery to either the +B or the +E connection points (TP1 or TP2).
For backlight versions, however, the correct operation will only be observed when the battery connection
is made to TP2 (+E), and the external supply is connected to TP1 (+B). Under this condition, the
backlight should only illuminate when the unit is supplied from an external supply. When operating on
its internal batteries , the backlight will be off.
The labelling of the circuit schematic diagram, Fig 9, in the manual is correct, but the component overlay in
Fig 10 shows the same error as the PCB's. Note that the copper legend on the PCB underside is also incorrect.