Revised August, 2004
10 TEGAM WAY • GENEVA, OHIO 44041 • 440-466-6100 • FAX 440-466-6110
•
5-4
MAINTENANCE
4.
To adjust R14, connect the test leads to a 1 GΩ resistor
and set the voltage switch to 100 V. Turn the power on.
Very carefully operate the Test pushbutton and adjust
R14 so that the display reads between 0.990 and 1.010
GΩ (for 1% accuracy). Turn the power off.
5.6
Troubleshooting
Disassembly
After removing the unit from the cabinet, it may be
disassembled as follows:
Remove the two knobs on the rotary switches.
Remove the four small screws holding the power
supply board to the threaded spacers.
Remove the four front panel screws that pass through
the front panel, metal tubular spacers, nylon washers,
the display board, into the threaded spacers.
The two boards may now be separated for service.
Re-assembly
After trouble-shooting and repair, re-assemble in reverse
order from above.
Following are possible symptoms, diagnosis, and repair
suggestions for use in trouble-shooting (the most likely
causes are listed first). Note that the TEST button must be
held in for most of these tests; do not try to bypass it
because it is a safety feature, shorting the high voltage
supply.
Note that even with the TEST button released; high voltage
still exists between the transformer secondary and R37.
