4)
Secure the new batteries in place by re-
placing the tie wraps.
5)
Replace the 620A-4R Igniter Tester front
panel top plate and re-tighten the calibration
access screws, taking care not to pinch any
wiring.
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 next to the power switch on
the 620 main operation top panel. Remove the
10 calibration access screws located around the
perimeter of the 630 top panel, if the top panel
has’nt already been lifted off or removed.
Use caution when lifting the 620 top panel off
by the handles
, as there is ~14” umbilical
wiring and ribbon cabling that connect the top
panel electronics to circuitry mounted inside the
bottom of the 620 case.
With an adjustable DC power supply, set the
power supply output to be 4.50 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 4.50 VDC applied from
the power supply. An increase in power supply
voltage to 4.52 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 620 top
panel to its original location. Return the
calibration access screws to the perimeter of the
620 main top panel .
2.
Adjust RV1 for a display indication of
100.00.
3.
Check the 2.0 KOhm range with the 1000
Ohm Standard Resistor. Check the 20 KOhm
range with 10 KOhm Standard Resistor. All
ranges must be within the specifications
outlined in Chapter B. There are no adjustments
necessary for the 2.0 KOhm and 20 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 620A series Igniter Tester
are durable and should provide years of trouble-
free operation. Some military maintenance
procedures may require replacement of the
620A-4R NICAD batteries as part of the
overall annual calibration plan, even if the
batteries are working well. As with all batteries,
replacement will eventually be necessary.
Batteries may be ordered from AMPTEC
RESEARCH as stock #05-10117, quantity: (4).
The process of battery replacement is described
below:
1)
Remove the calibration access screws (10 of
them) located around the perimeter of the 620A
series igniter tester front panel.
Carefully
lift
off the 620A series igniter tester front panel
top plate by the handles. Note: ~16" of
umbilical wire cabling connects the top plate
electronics to the main PCB inside the bottom
of the 620A series igniter tester case.
Delicately place the 620A series igniter tester
front panel - top plate (face side up) on the top
bezel, with the umbilical wiring intact.
2)
Locate and cut the battery retaining tie wraps
on the bottom of the 620A series igniter tester
(next to the main PCB).
3)
Remove the old batteries and replace.
Observe polarity!
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