193111-050
MAINTENANCE
November 17, 2020 6-1
WARNING: ELECTRICAL SHOCK
HAZARD — Before inspecting or
cleaning inside cabinet, turn OFF
and remove fuses of disconnect
switch (supplying AC power to
charger), disconnect battery, and
check for voltage on capacitors.
Discharge through insulated
screwdriver if there is any reading.
Inspection And Cleaning
For uninterrupted, satisfactory service from this
charger, it's necessary to keep unit clean, dry, and well
ventilated. At least every three months, or more often
as necessary, wipe and blow out all dirt from unit's
interior components, with clean, dry air of not over
25 psi (172 kPa) pressure. Use a hand bellows if
compressed air isn't available.
Check and tighten all electrical connections as
necessary to eliminate unnecessary losses and to
avoid subsequent trouble from overheating or open
circuits. Check for broken wiring or damaged insulation
on wiring.
WARNING: ELECTRICAL SHOCK
HAZARD — Failure to keep internal
parts clean and dry may allow
transformer (s) to short out,
causing secondary circuits to
carry dangerously high voltage.
Be sure to replace all charger cabinet panels after any
servicing, to assure proper flow of cooling air through
unit and to protect internal components.
WARNING: ELECTRICAL SHOCK
HAZARD — All cabinet panels must
be replaced to protect personnel from
contact with hazardous voltages.
Lubrication
None required.
Fuse Replacement
The silicon diodes in this charger are protected by a
“fast-clearing” type fuse.
CAUTION: The use of any other type
fuse besides the “fast-clearing” type
may cause damage to silicon diodes.
Silicon Diode Testing
WARNING: ELECTRICAL SHOCK
HAZARD — Before checking electrical
components, turn OFF and remove
fuses of disconnect switch (supplying
AC power to charger), disconnect
battery, and check for voltage on
capacitors. Discharge through insulated
screwdriver if there is any reading.
1. Disconnect one diode lead to isolate diode from
electrical circuitry.
2. Use a good quality ohmmeter (preferably one
having a mid-scale value of approximately
50 ohms) to measure resistance values.
3. Zero ohmmeter on R x 1 scale.
4. Record indicated resistance while placing either
ohmmeter lead on threaded end of diode and
other ohmmeter lead on diode lead.
5. Reverse ohmmeter leads on diode and record
indicated resistance.
6. Consider diode good if one resistance reading is
infinitely (or very) high and the other is extremely
low.
NOTE: An acceptable low resistance value
or range of values can't be given because of
different readings from different ohmmeters,
and differences in diodes of the same rating.
Capacitor Testing
1. Heed WARNING in Silicon Diode Testing section.
2. Disconnect capacitor and connect leads of
ohmmeter (set to highest scale) to capacitor
terminals.
MAINTENANCE
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