Thermal Arc 300GTSW Pro-Wave, Руководство по обслуживанию

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pro-wave 300gtsw
6-46
June 21, 2012
6.39 HF Unit Test and Replacement
Procedures
HF Unit test procedure
1. Place the PROCESS SELECTOR Switch in the
STICK position.
2. Jumper pins 1 and 5 on the CN7 plug. Apply power
to the unit.
3. If the high frequency buzz is heard coming from
the HF Unit, the Main Circuit Board (PCB1) should
be replaced. If no sound is heard coming from the
HF Unit, the HF Unit should be replaced.
HF Unit replacement procedure
To remove the HF Unit:
1. Remove the Output Inductor Assembly per section
6.37 page 6-42.
2. Remove the Output Bus Bar/CT Assembly by
removing the bolt inside the POSITIVE (+)
OUTPUT TERMINAL and the two screws holding
the bus bar to Q3/Q4. Remove the connector from
CT1.
3. Remove the Coupling Coil by removing the bolt
inside the NEGATIVE (-) OUTPUT TERMINAL
and hardware from the bus bar/T1/T2 center tap
junction.
4. Disconnect BLACK wires to the HF Unit.
5. Remove the lugged wires from the AC1 and AC2
terminals.
6. Remove the two (2) screws that secure the HF
Unit to the chassis.
To replace the HF Unit:
1. Apply a liberal amount of thermally-conductive
grease to the bottom of the new HF Unit.
2. Hold the new HF Unit against the chassis while
you replace the two screws that hold the HF Unit
onto the chassis. Be sure to orient the new HF Unit
in a similar manner to the one just removed, with
the AC1/AC2 terminals and resistor R1 toward the
front of the unit.
3. Reverse the remaining removal steps.