Selco Genesis 240 TLH, Repair Manual

Page: 45 / 82

Diagnosis procedure 127
G 240 TLH :
Phase 1: same as G 240.
Stage 2 : Machine connected to mains
Disconnect connector CN2 of board 15.14.236
Disconnect connector CN2 of board 15.14.192
Disconnect connector CN1 of board 15.14.233
Disconnect connector CN1 of board 15.14.254
Disconnect connector J9 (if cooling unit is present)
Close the master switch
Select MMA operating mode
Checks :
With a tester set to Vac, check that there is a voltage of 400 Vac between points a, aa and aaa of board 15.14.233
(connection to output terminals of master switch).
yes : go on ; no : after disconnecting the machine from the mains power supply, check:
- that the current plug is correctly fitted on the power supply cable
- that the power supply cable has not been interrupted
- that the master switch is closed
- that the cables are correctly fitted to the master switch
NOTE : the above test can be performed by taking the measurement between points U, V and W indicated in the figure
but in this case, if a negative result is obtained, it can depend not only on the causes listed above but also on the state
of the tracks of the 15.14.233.
After removing board 15.14.192, take the following measurements (values @ 400 V line voltage):
Board Connector Cables Value
15.14.233 CN3 52-50 = 400 Vac
yes : go on ; no : after disconnecting the machine from the mains power supply, check continuity of the tracks on
board 15.14.233 (see drawing)
- between V and cable no.52
- between U and cable no.50
yes : go on ; no : replace board 15.14.233
Board Connector Cables Value
15.14.233 CN3 53-53 = 230 Vac
15.14.233 CN3 51-50 = 230 Vac
yes : go on ; no :
- check correct connection of cables 53 (x two), 51 and 50
- replace auxiliary transformer 05.11.259
Board Connector Cables Value
15.14.254 CN1 17-18 = 230 Vac
yes : go on ; no :
- check fuse F2 on board 15.14.233
- check correct connection of cables 17 and 18
Board Connector Cables Value
15.14.236 CN2 54-54 = 24 Vac
15.14.236 CN2 55-55 = 9 Vac
yes : go on ; no :
- check correct connection of cables 54 (x two), 55 (x two)
- replace auxiliary transformer 05.11.259
With the master switch open, reconnect CN1 of board 15.14.254
Close the master switch and measure again
Board Connector Cables Value
15.14.254 CN1 17-18 = 230 Vac
yes : go on ; no : replace board 15.14.254 (and fuse F2 if necessary)
With the master switch open, reconnect CN2 of board 15.14.192
Close the master switch and measure again