Vulcan-Hart 3-130, Service Manual

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5 – 6
SECTION 5 - TROUBLESHOOTING - 3-STAGE
5.6 DIAGNOSTIC TABLES
PERIPHERAL DRIVE CIRCUIT
Fault Setup Check Results desired
All Y outputs N/A U6-1, 2, 6
high No stuck bits
Turn furnace Display/ No Error codes
Off then On LED's Display OK
Turn furnace D2, D3, D4, D6 Not shorted or open
Off
MOTOR DRIVE CIRCUIT
Fault Setup Check Results desired
No door up or down Furnace in idle U8-16 +12 VDC
when switch is activated Disconnect J5 U8-10-15
Turn furnace on
Activate switch
Activate switch
Turn furnace off
Turn furnace on
U13-15 digital high
Motor switch Other keys respond
At up or down Add mA meter in Stall > 550 mA at up
position series at J5 current or down