WARNING
e . Timers. The charge timers control
Dangerous voltages are present within the
t h e length of the charge cycle, while
equipment. Always disconnect power cable
t h e discharge timer determines whether
before opening up the unit for inspection or
t h e battery has passed or failed the
service.
c a p a c i t y t e s t . C h e c k the timers for
c. Power Cable Assembly. The power cable assembly
p r o p e r switchover points, with the equip-
is a three-wire cable terminated by a 4-pin connector,
m e n t turned off, by turning the timer
P3. A defective cable maybe indicated when operation
k n o b s ccw until. a click is heard, The
of front-panel switching does not energize the equip-
c l i c k for the charge timers should occur
ment. Check cable continuity; if an open or high-resist-
a t the 1 h o u r point. The click for the
ance is indicated, the cable is defective and should be
d i s c h a r g e timer should occur at the 6 0
replaced.
m i n u t e s setting. If the switchover
d. Fuse. Fuse F2 is rated for 100 amperes and pro-
points (clicks) occur at other than those
tects the charger circuits against external battery ca-
t i m e s given above, then an adjustment is
ble shorts or reverse connections. If the equipment is
r e q u i r e d . If necessary, the switchover
energized when ac power is supplied but the battery
p o i n t cm be corrected by loosening and
does not charge, or no voltage is measured on voltmet-
r e a d j u s t i n g the timer knobs.
er (M4) with switch (S3) in the W-volt position, F2
should be suspected. Fuse F2 is located inside the unit
4-9. Removal and Replacement of Knobs
at the top right side and is retained by blade-type con-
tacts. Remove the fuse, check continuity and replace,
Each of the control knobe is secured to the respective
shaft by two setscrews before removing a knob, set the
if necessary.
control to a readily identifiable position so that there-
placement knob can be set accurately to the same origi-
nal position. To replace a knob, loosen or remove the
setscrew and carefully lift the knob from the shaft. Be-
fore replacement, check to see that the knob dial point-
er tracks properly with dial markings.
Change 1
4-3