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6. Remove and set aside the four hex nuts, washers, lock washers (#1,2,
and 3) and battery bracket (#4) that secures the battery to the base.
7. Lift the battery (#5) and turn it so that the terminals are facing upwards.
Remove the connectors from the terminals and lift the battery away
from the unit.
8. Replace the battery with the new one. The terminals should be oriented
upwards. Reconnect the battery connectors to battery, connecting the
red right angle connector to the + Terminal and connecting the straight
clear connector to the - Terminal.
9. Secure the battery with the bracket and hex nuts. Tighten the hex nuts
securely without overtightening.
10. Reconnect the battery wire harness to the PCB.
11. Reinstall the MK-III panel using the screws and washer previously
removed.
13. Reconnect all devices to the front panel.
3.2
AC POWER
To operate the MK-III using AC power, connect the supplied charger/
maintainer AC power cable to the Charger/Maintainer input (Fig 1, #14).
Connect the Charger/Maintainer power plug to an AC power outlet that
supplies 90–240 volts at 50/60 Hz.
Operation of the unit with AC power will supply charging current to the
battery. See Section 3.1.1 for safety precautions. While operating the unit
with AC power, you do not have to open the safety valves.
Note: The standard AC power cable has a plug compatible with the standard
electrical outlets used in the U.S.A. However, if you need a plug for a
different region of the world, appropriate power cords are available from
OTS or your OTS dealer.
3.3
EXTERNAL DC POWER
To operate the MK-III using an external 12-volt DC power source (such
as a lead-acid battery of 5.0 Ah or other DC power supply of at least 3A),
connect electrical cables via a mini double banana plug to the DC power
receptacle (Fig. 1, #14) on the MK-III front panel. Be sure to connect the
negative lead to the black socket and the positive to the red.
If the voltage of the external DC power source falls below that of the internal
battery, the MK-III will begin to draw current from both power sources.
Therefore, the battery level indicator (Fig. 1, #15) will monitor the voltage
of both the internal battery and the external DC source.
506279-000
12
REV. A
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