Low Battery Indicator:
The variable potentiometer - trimpot RV3 is
factory adjusted to have the low battery
indicator come on at 4.50 VDC. To make this
adjustment,
remove the fuse
from the
fuseholder located
on the rear panel of the
620ES
. Remove the lid of the 620ES SAfety
Igntier Tester( screws that secure the lid are
located are in the feet of the unit).
With an adjustable DC power supply, set the
power supply output to be 4.60 VDC. Observe
power supply polarity. Connect the power
supply to the wiring labeled “
MAIN
” + pos.
and - neg. located in the rear section of the
MAIN PCB. (i.e po power supply output
to the anode side). Adjust trimpot RV3 to have
the low battery indicator just come on (negative
sign on display) with 4.60 VDC applied from
the power supply. An increase in power supply
voltage to 4.62 VDC should have the low
battery indicator go out. The low battery
indicator adjustment should now be complete.
Disconnect the power supply, and return the
fuse to the fuse holder. Replace the lid, re-
secure the screws through the feet of the
AMPTEC 620ES Safety Igniter Tester.
leads to the 1.00 ohm standard resistor.
2.
Adjust
RV6
for a display reading of 1.0000
Ohms.
3.
Check the 200 KOhm range with the 100 Kohm
Standard Resistor. All ranges must be within the
specifications outlined in Chapter B.
There are no
adjustments necessary for the 200 KOhm and 200
Kohm ranges.
Contact AMPTEC’s customer
service department if further technical support is
necessary.
F-4.
Battery Replacement Instructions
The rechargeable NICAD batteries (D cell 5.0 AHr
each) used in the 620 series Igniter Tester are
durable and should provide years of trouble-free
operation. Some military maintenance procedures
may require replacement of the 620ES NICAD
batteries as part of the overall annual calibration
plan, even if the batteries are working well every
other year. As with all batteries, replacement will
eventually be necessary.
Replacement batteries may be ordered from
AMPTEC RESEARCH as stock #620-BAT which
is a quantity of 1 complete set of 4 ea "D" cell
Heavy Duty NICAD Batteries). The battery
replacement process is :
1)
Remove the 4 screws located in the feet of the
unit.
Carefully
lift off the lid from the siderail
grooves. Unscrew the perimeter screws that hold
the main PCB in place, taking note of the PCB
spacers which will have to be returned when
completed. remove the old batteries. and replace
with new batteries
Observe
polarity!
in the same
fashion.
Re-secure the main PCB with the spacers
underneath as it was found. Return the lid in place
into the front panel grooves and siderail grooves.
Re-secure the lid screw in the feet.
4)
Secure the new batteries in place by re-
connecting the battery retaining plate.
5)
Replace the 620ES Igniter Tester front panel top
plate and re-tighten the calibration access screws,
taking care not to pinch any wiring.
