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5-TRANSFORMER TESTING
Testing the transformer consists of measuring the AC voltage across the transformer secondary leads that
connect to the diodes. This voltage is measured first with the capacitor disconnected and compared to the
voltage measured with a capacitor connected that has been tested and found good.
DANGER!
HIGH VOLTAGE! With the charger operating, the charger capacitor voltage is approximately 650 volts
AC. Use extreme caution when working near capacitor terminals.
A
Disconnect the transformer secondary coil leads #1 and #4 (TAN SLEEVING) from the diode terminals.
Loosen the capacitor strap and carefully disconnect the transformer capacitor coil leads from the capaci-
tor terminals.
B
Refer to the transformer test voltages diagram on the wiring diagram and parts list page for the specific
part number charger and adjust the voltmeter to an appropriate AC voltage range. Attach the meter test
leads to the identified transformer coil leads.
C
Checking to be sure for personal safety, and that no leads have been accidentally allowed to short, follow
the instructions below to energize the transformer primary.
•
MANUAL TIMER CHARGER
Turn the timer knob to "ON" and connect the power supply cord to an outlet while recording the voltage
reading and unplug as soon as the reading is noted.
•
AUTOMATIC TIMER CHARGER
Connect the DC plug to the charger receptacle and listen for the relay to "click" on 2 to 5 seconds after
the connection. Connect the AC power supply cord to an outlet while recording the voltage reading and
unplug as soon as the reading is noted.
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BATTERY CHARGER SERVICE MANUAL
FORM NO. 56041170 / BATTERY CHARGER SERVICE MANUAL / PARTS LIST - 11
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