Inspection Check And Repair; Voltmeter, Ammeter And Control Switches; Indicating Lights; Power Input And Output Lights - Hobart GPU-600 Operation And Maintenance Manual

Section 2. INSPECTION CHECK AND REPAIR

1. General

This section describes inspections and checks to be performed in conjunction with Inspection/Check
Schedule, Figure 1. For satisfactory service, keep the power supply clean, dry, and well ventilated. At the
prescribed intervals or more often as necessary, disconnect the power supply from the input power
source and wipe and blow out all dirt and other foreign materials from the internal components, including
the fan blades. Air pressure should not exceed 25 ps; (172 kPA).

2. Exterior Cables and Connections

A. Input and Output Cables
Observe general condition of power input cables and equipment output cables. Inspect for cuts and
abrasions in the insulation which could cause a short circuit. Visually inspect the output cable plug
connector for physical damage and evidence of overheating.
B. Cable Connections
Check all input and output cable connections for tightness and security.
WARNING: HIGH VOLTAGE - ELECTRIC SHOCK CAN KILL! TURN THE
SOURCE OF INPUT POWER OFF WHEN CHECKING THESE CONNECTIONS.
BE CERTAIN CAPACITORS ARE DISCHARGED BEFORE TOUCHING THE
CIRCUITRY.

3. Controls and Instruments

A. Voltmeter, Ammeter and Control Switches
These components can be damaged by abuse, shipping, and type of use. Observe these instruments
at each "start-up" to verify they are operating. If one of the meters is suspected of being inaccurate,
check it against a master, or test instrument. Replace any faulty or intermittently faulty switches imme-
diately.
B. Indicating Lights

(1) Power input and output lights

Life of incandescent bulbs varies with the magnitude of voltage and vibration. Check the lamps
(bulbs) in these lights by substituting a known good replacement lamp. If the lights do not glow af-
ter the replacement, the circuitry is defective and should be repaired. If the proper voltage
reaches the base terminals, replace the base; if not correct the wiring fault.
April 10/89 Revised
OM-2010
3-2
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