Vulcan-Hart 3-130, Руководство по обслуживанию

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5 – 7
5.6 DIAGNOSTIC TABLES
ANALOG CIRCUITRY
Fault Setup Check Results desired
Muffle heats but N/A YELL2 TC yellow connected
display shows U4 Gain approx. 20
same temperature D1 1.23V
Erratic temperature D1 1.23V stable
display N/A U4-11 & 12 DC stable
Temperature drift Hi T = 960°C RED 39-40mV stable
U4-13 mV stable
(.2mV/°C ambient
increase typical)
Turn furnace off Reconnect No Err2 at elevated
TC wires temperatures
DISPLAY BOARD
Fault Setup Check Results desired
LCD dots are all Furnace in idle J8-1 +5V
on or off at power up
J4-8 Tight fit
No LED's light up Perform power up Front Panel LED's turn off one
by one
N/A J8-4 +12V
One LED does not come on Turn furnace off LED Not open or
shorted
LCD display is darker Turn furnace off Temperature on Less than 40°C
panel
Turn furnace on Temperature on LCD lighter shade
panel
SECTION 5 - TROUBLESHOOTING - 3-STAGE