Selco Genesis 240 TLH, Repair Manual

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128 Diagnosis procedure
Board Connector Cables Value
15.14.192 CN2 24-25 = 230 Vac
yes : go on ; no : replace board 15.14.192 (and fuse F2 if necessary)
Refit front panel FP106.
With the master switch open, reconnect CN2 of board 15.14.236.
Close the master switch and measure again
Board Connector Cables Value
15.14.236 CN2 54-54 = 24 Vac
15.14.236 CN2 55-55 = 9 V
yes : go on ; no : replace front panel FP106 (and fuse F2 if necessary)
With the master switch open, reconnect CN1 of board 15.14.233.
Close the master switch and check operation of the fan (presence of air flow from back to front of machine).
yes : go on ; no : check connection of fan or replace it
Stage 3 : Select TIG DC H.F. 2-strokes operation from front panel.
Checks :
Press the torch button without bringing the torch near to the piece and check that the red led L3 on the front panel
comes on.
yes : go on ; no : remove the fixing screws of the front panel FP106, position it to gain access to connectors CN2 and
CN4 and, with a tester set to Vdc, measure between the points of board 15.14.236:
- CN4/4 - CN4/3 = 34 Vdc with torch button released
- CN4/4 - CN4/3 = 0 with torch button pressed
yes : go on ; no :
- check the torch button
- check continuity between CN4/4 and pin 3 Mechafin and CN4/3 and pin 5 Mechafin
- replace the front panel FP106
Stage 4 : (Skip this phase if there is no cooling unit WU15).
Press the torch button for a moment without bringing the torch near the piece.
Checks :
With a tester set to Vac, measure between the points of J9 (see drawing):
- J9/5 - J9/10 = 230 Vac @ 400 Vac power supply
yes : go on ; no :
fuse F1 on board 15.14.233 has blown
yes : replace F1; no : with a tester set to Vdc, measure between the points of board 15.14.254:
CN2/5 - CN2/12 = 17 Vdc
yes :replace board 15.14.233; no : measure between the points of board 15.14.254:
CN3/8 - TP3 = 5 Vdc
yes : replace part 14.60.060; no : replace panel FP106
After connecting connector J9, check operation of the cooling unit pump
yes : go on ; no : check connection of cooling unit pump or replace it
Check operation of the cooling unit fan (presence of air flow at side of unit).
yes : go on ; no :
- with a tester set to Vac, measure between the points of J9:
- J9/2 - J9/7 = 230 Vac @ 400 Vac power supply
yes : - check wiring ;
- replace fan
no : - check fuse F2 on board 15.14.233
- replace board 15.14.233