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WARNING
ELECTRIC SHOCK can kill
Have an electrician install and service this
equipment
Turn the input power off at the fuse box before
working on equipment
Do not touch electrically hot parts
Prior to performing preventive maintenance,
perform the following capacitor discharge
procedure to avoid electric shock.
DISCHARGE PROCEDURE
NEG
INPUT BOARD - Figure 1
Showing 315DC input board
35
INPUT FILTER CAPACITOR
DISCHARGE PROCEDURE
1.
Remove main input power to the
315DC or 415DC
2.
Remove the cover following the case removal
procedure available in this Service manual.
3.
The capacitors are discharged by discharge
resistors integrated into the input board in about
5 (five) minutes.
4.
Locate the two points POS and NEG on the
Input Board. See Figure 1
5.
Connect your multimeter positive probe to POS
point and your negative probe to NEG point and
check the voltage across DC bus capacitors.
6.
In case of presence of any residual voltage
follow the next steps
7.
Obtain a high resistance and high wattage
resistor ( 500-1000 ohms and 25 watts
minimum ). This resistor is NOT supplied with
the machine. NEVER USE A SHORTING
STRAP FOR THIS PROCEDURE.
8.
Use electrically insulate gloves and insulated
pliers. Hold the body of the resistor and connect
the resistor leads across the two points POS and
NEG. See Figure 1. Hold the resistor in place
for 10 seconds. DO NOT TOUCH CAPACITOR
TERMINALS WITH YOUR BARE HANDS.
9.
Check again the voltage across the two
terminals (POS and NEG). Voltage should be
zero. If any voltage remains, repeat this
procedure.
POS
CITOTIG
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