MK Products WC-1-110 - Manual (Page 14)

Owner’s Manual - Page 13
Your WC-1 is designed to provide years of reliable service. Normal wear and
component failure may require occasional service.
The number of units in operation and the importance of minimal "down time"
will determine to what extent spare parts should be stocked on hand. The
following list comprises the most commonly replaced parts on the WC-1.
WC-1 Recommended Spare Parts List
QTY P/N DESCRIPTION
1 003-1636 Main P.C. Board
1 003-1644 Front Panel Board
Section 8 TESTING THE TORCH
Motor Check
Remove the amphenol connector from the WC-1.
Using the torch amphenol, check the resistance across pins “A” and “B”
(motor leads). The resistance across the motor should be between 5-10
ohms.
If an open circuit or short exist, check the motor leads and motor
independently.
Testing The Potentiometer
Using the torch amphenol, check the resistance across pin “D” (wiper) and pin
“C”. The resistance should vary from 0 - 5K ohms.
Check the resistance across pin “D” (wiper) and pin “G”. The resistance
should vary from 5K - 0 ohms.
Testing The Micro Switch
Using the torch amphenol, check for continuity across pins “E” and “F” when
the trigger is pressed.
Section 9 RELAY K2 OPERATION
When the torch trigger is pressed, 24VAC is sent to the coil of relay K2. When
K2 is energized, 115VAC is sent to the 115VAC contactor. Relay K2 is also
responsible for sending 24VAC to the speed control circuit and shorting the
torch motor leads together when the trigger is released for the dynamic braking
system. K2 also provides the closing contactor signal.
Section 10 TESTING THE 115 VAC CIRCUITS
The 115 VAC circuit is protected by fuse F3. If either continually blows,
remove J5-3,4 (115 VAC Contactor) from the P.C. Board. Replace fuse, and
retrigger system.
Section 11 TESTING THE SPEED CONTROL
NOTE:
The torch should be tested first and the amphenol must be
connected to the WC-1 to perform this test.