Miller Electric Legend AEAD-200-LE User Manual

Page 28

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TM-428 Page 24

Miller Legend

NO

NO

NO

YES

Connect meter (AC) between

terminal G and terminal E.

0 (zero) volts dc

present after 12 to 18 seconds?

Connect meter (DC) between

terminal C (+) and terminal E (–).

0 (zero) volts ac present?

YES

Reinstall cover.

Check for internal

load such as

shorted diode in

Connect a 100 watt light bulb to

100 Hz ac receptacle.

Connect meter (AC) between

terminal G and terminal E.

Minimum of 1 volt ac present?

YES

Disconnect 100 watt light bulb

and meter leads.

Connect meter (DC) between

terminal C (+) and terminal E (–).

+12 volts dc present?

YES

Reinstall cover.

Check connections

to current

transformer CT1.

Engine does not go to power/idle rpm

with no weld load applied.

Engine does not go to weld rpm with

load applied.

NO

main rectifier SR1.

NO

0 (zero) volts dc present?

Connect meter (DC) between

terminal D (+) and E (–).

YES

NO

Connect meter (DC) between

terminal B (+) and terminal E (–).

YES

+12 volts dc present?

Check connections

to Engine Control

switch S2 and

ground connection

(lead 33).

Start engine. Place Engine Control

switch S2 in Run/Idle position.

Check connections

to Engine Control

switch S2.

Start engine. Place Engine

Control switch in Run/Idle position.

Start engine. Place Engine Control

switch S2 in Run/Idle position; Idle

Lock switch S1 in Unlock position.

Check throttle solenoid TS1

linkage.

Check circuit breaker CB4, throttle

solenoid TS1 connections and

linkage, and control relay CR2.

Replace idle

board/module

PC1

Replace idle

board/module

PC1

6-6.

Troubleshooting Flowcharts For Idle Control Board/Module PC1

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