10.8) HF PC board 15.14.192
This board generates HF high voltage impulses to strike the pilot arc.
Notes:
* ATTENTION! Before performing this measurement , disconnect the HF circuit (FN1 & FN2) in order to prevent damages and
injuries due to HF discharges!
** The command (+8Vdc) lasts about 2 seconds after pressing the torch button but only if no arc is struck. If during these 2
seconds the pilot arc is struck, the command is immediately switched off. This test must therefore be performed with FN1 and
FN2 disconnected.
Unless specified otherwise, all the measurements must be taken with the boards fitted, together with their connections!
Description, testing and replacement of the electronic boards, current calibration 39
Functional part
Auxiliary power
supplies
HF output
Power supply
voltage
Auxiliary power
supply
HF control*
Generator / Mode
OFF
OFF
ON
ON
ON
Component
MF1
R24
S1
-
-
-
Test point
TP4 TP6
TP4 TP3
-
G K
K A
CN2/1 CN2/4
TP5 TP4
TP1 TP4
CN1/1 CN1/2
Value
+0.5Vdc
10kΩ
10Ω
25Ω
+0.5Vdc
+250Vdc
+18Vdc
+15Vdc
0Vdc
+8Vdc
Notes
Trigger released
It stays for 2 sec. with
trigger pressed **
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