TM 11-6130-413-40
charged battery. Set up charger/analyzer for manual
slowly counterclockwise until switch clicks. Observe
discharge operation, in accordance with paragraph
that CHARGE 2 (DS1) and RUN (DS6) lights go off,
3-4. Allow unit to run until battery voltage is below
charging stops, and PASS light (DS2) remains on. This
.95 volts per cell. This verifies correct operation of
concludes the checkout of automatic modes of opera-
manual discharge circuits (EOD disabled in this mode
tion.
of operation).
h. Disconnect charged battery and reconnect dis-
3-6. Troubleshooting Procedures
The following troubleshooting procedures will aid in localizing equipment failures to a component part or to an as-
sembly. In the event that equipment failures are caused by a defective circuit board assembly, further repairs are to
be accomplished at depot level. For internal access refer to paragraph 3-10.
Probable Cause
Corrective Action
Malfunction
Item
Blown output fuse F2 (100A).
Battery does not charge (no current)
Check fuse F2. If good, voltmeter (M4) will read
1
leas than 30 volts during charge; if open, make a
thorough visual check of unit for damaged com-
ponents. If so, repair and/or replace before pro-
ceeding. If F2 blows consistently (high ambient
temperature) move primary tap "0" to "+5%"
(10 AWG blk).
Defective battery under test,
2
Check with good battery.
Battery does not get full charge (read
Check for shorted cells.
battery voltage in RESET or OFF
mode) Battery should trickle-charge
High capacity battery with charge
Raise rate of charge by 10%.
during the final 5 to 10 minutes of the
rate set to low.
charge cycle. CHARGE AMP-HR set-
ting should be close to the one-hour
rate for a good battery under test.
(Note that there are some 30 AH bat-
teries that may have an actual 42 AH
capacity.)
Reset transformer taps to match line voltage.
Operation at leas than 208v with
T1 set at 230v.
Current amplifier or integrator
Connect ammeter (0-50 Adc) in series with the bat-
malfunctioning.
tery cable (disassemble connector) and compare
current during discharge with the meter on the
panel of the unit. If they agree 2 amperes, the
current amplifier is functioning.
If the current amplifier is functioning properly,
place a battery on charge and note voltage at
which the unit goes to low charge rate. If it does
so at leas than 28 volts, the voltage comparator
circuit associated with U13 and U14 is malfunc-
tioning and must be repaired. (Control voltage is
28v for 19 cell, 29.5v for 20 cell.
Replace defective components.
Integrating capacitors C10 and
Cll, or input resistor R48 have
drifted to lower values, result-
ing in a shorter time constant.
Connect oscilloscope between T1 secondary termi--
One of the SCRS (Q7, Q8) is open
nal "o" and ground and observe that figure 3-1
or not getting gate signal. In
waveform (A) appears. If waveform S(B) ap-
this instance, a low capacity
pears, replace associated SCR (Q7,Q8) and/or
battery would charge properly,
check gate generator circuits.
but there would not be enough
time in the period to get in the
current needed for larger bat-
teries.
Charge a battery for an hour with the charger cov-
Corroded or loose connection
er off-then disconnect the unit. Touch current-
causing voltage drop, limiting
carrying terminals and check for heating. If a
output current.
connection is hot, disassemble it, check for
burned or corroded surface, poor terminal
crimps, etc. - then reconnect, tightening careful-
ly.
3-5
