BATTERY CHARGER ADJUSTMENT (For Battery Assembly P/N 6025-1018).

TM 11-5820-917-13

Battery is between 18 and 22 volts.

(2) Green and red BATT test lamps

Conditions are marginal for operation.

both light:

Battery pack must be charged soon (if

rechargeable type).

Battery is less than 18 volts. Battery

(3) Red BATT test lamp only lights:

pack must be replaced or recharged; or

BATT switch is off.

5-16. BATTERY CHARGER ADJUSTMENT (For Battery Assembly P/N 6025-1018).

The battery charger circuit, located inside the rechargeable battery box, auto-

matically recharges depleted batteries and provides a floating trickle charge to

maintain the batteries in a fully charged state during normal AC line power

operation of the RCS receiver. Battery capacity and lifetime are dependent on

the charging circuit output voltage. A charging voltage that is too high can

damage the batteries, and too low a voltage does not maintain adequate charge in

the battery cells. The battery charger circuit is set at the factory for a trickle

charge voltage of +28.2 VDC which results in a 5 mA trickle charge current when

connected to a fully charged battery pack. (This voltage will vary depending on

the state of charge of the batteries). The battery charger circuit should not nor-

mally require readjustment. If adjustment is required due to replacement or aging of

components, adjust as follows:

Remove battery pack (6025-1018) from the 6025 unit.

Remove top cover of battery pack.

to the battery charger circuit card inside the battery box. The positive (+) out-

put lead of the power supply must connect to terminal E1 of the circuit card and

the negative (-) output lead must connect to terminal E2 (ground).

d. Connect the positive lead of a digital voltmeter to TP1 and the negative lead

to E 2 of the charger circuit card.

voltage of +28.9 VDC at TP1.

f. Move the voltmeter to terminal E4.

VDC) if the batteries are charging properly.

g. If the voltage at E4 is greater than +28.3 volts, check fuse F2 and switch

S1 for continuity or replace battery pack.

h. If voltage at E4 is less than +28.1 volts, allow battery pack to charge for

24 hours, then repeat steps e and f. If E4 voltage is still low, replace battery

pack.

i. Turn off +35 VDC supply, disconnect supply and DVM, and momentarily

depress pushbutton switch S1 on the circuit card.

Replace battery box cover and reinsert battery drawer in 6025 front panel.

5-7