5
3.2 TEST PROCEDURES
A. Power light (D2) does not light.
1. Visually check machine for any damage.
2. Check if fan is running. If not, check following:
a. Check if machine is correctly plugged into mains.
b. Measure voltage level at mains terminal.
c. Check if circuit breaker Q is closed.
3. If above is OK, check voltage on PCB (PL60) – between points X1-6, X1-7 (24V AC±5%). If it is OK,
check LED D2 on front panel and its connections, fuse F1 (1,6A) (replace if opened) and control board.
Depending on test results, replace faulty apparatus
B. Malfunction of gas valve.
1. Check voltage on TR2 secondary terminals 11 & 12 (24 VAC). If not correct, than transformer is
faulty.
2. Check fuse F1 (1,6 A), replace if open.
3. Disconnect connectors X1, X2 and check wiring between TR2 and EZ1 check coil continuity and
resistance. Rectify miswiring or replace valve coil if necessary.
C. No airflow.
1. Check air supply. Unit requires min. 130l/min @ 3,5 bar, check supply terminal if necessary.
2. Check air line connections. Tighten if leaking. Check for any obstruction in air line as well.
3. Airflow may be blocked at torch tip. Check torch consumables. Also check for any obstructions in
torch lines.
NOTE: If above is OK, check all parts of air control and distribution circuit as per Fig. 3-7.
D. No “torch switch depressed” signal.
1. While depressing torch switch D3 LED should be lit for 2 sec (T
B
on diagram).
- If not check torch switch and leads. Unplug the torch switch leads at machine terminals, connect
ohmmeter to the leads. After switch is depressed it should read short. If not - switch or leads are
defective.
- If signal “ON” is OK – replace PCB.
E. “FAULT” LED (D1) is lit.
1. “FAULT” LED is lit (also when torch switch is released):
a) When machine is cold (i.e. it did not work within last 2÷3 hours) and LED D1 is lit, that means
temperature monitoring circuit is open. Disconnect connector X1 from PCB and check with ohmmeter
temperature switch WT1 on main transformer and its wiring. Rectify wiring or replace WT1 if
necessary.
b) When machine is hot, let it cool down. If “D1” LED is still lit, follow above p. a).
2. “FAULT” LED lights continuously, when gas valve is energised and air flows (also in postflow mode,
i.e. when torch switch is released).
c) Flow rate too low - adjust air parameters.
d) Air switch CZ1 or its wiring is faulty. Disconnect connector X1 from PCB and check with ohmmeter
sensors CZ1 and its wiring. Rectify wiring or replace CZ1.