Thermal Dynamics 51 CUTMASTER, Руководство по обслуживанию

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Manual 0-2972 5-11 REPLACEMENT PROCEDURES
C. Pilot PC Board Replacement
The Pilot PC Board mounts to the Power Supply center
chassis. Refer to Pilot Board Layout in theAppendix.
1. Remove the cover per Subsection 5.04-A.
2. Label and disconnect wires from Pilot PC Board
terminals E58 and E62. Disconnect the wire har-
ness from receptacle J28.
3. Remove the hardware securing the Pilot PC Board
to the power supply center chassis. Remove the
Pilot PC Board.
4. Position the replacement Pilot PC Board against
the standoffs fastened to the center chassis. Note
that the Pilot PC Board mounts with its printed text
upside down. Fasten the Pilot Board to the stand-
offs with the hardware removed previously. Torque
the hardware to 18 in-lbs (2.04 Nm).
5. Reconnect the wires to the Pilot PC Board. Wire #58
connects to terminal E58; wire #62 connects to ter-
minal E62. Ensure that the wire harness connector
is fully seated in receptacle J28.
6. Reinstall the power supply cover.
D. Main Transformer (T5) Replacement
The Main Transformer is located behind the Fan Shroud.
For access to the Main Transformer, remove the Solenoid/
Pressure Switch Assembly and the Fan and Fan Shroud.
1. Remove the cover per Subsection 5.04-A.
2. Release the tabs on the side and top of the Fan
Shroud securing the Solenoid/Pressure Switch
Assembly in position, enabling the Assembly to
move freely.
3. Remove the gas hose from the Solenoid Fitting by
pressing on the locking ring while pulling on the
hose.
4. Remove Fan per Subsection 5.08-B. The Fan Shroud
cannot be tilted up until the Fan wires are discon-
nected from the Fan. Removing the Fan also pro-
vides better access to the Main Transformer for re-
installation.
5. Remove the nuts securing the Fan Shroud to the
Center Chassis.
6. Locate the two tabs below the Main PC Board se-
curing the Fan Shroud to the Center Chassis. Use
a screwdriver to push these tabs down to release
the Shroud.
7. Label and disconnect cables at the following points
on the Main Power PC Board. Refer to the Appen-
dix pages for wiring details.
• Primary to Main PCB Terminals E4 and E35
• Secondary to Main PCB Terminals E8 and E9
8. Tilt the Fan Shroud up from the bottom to expose
the Main Transformer and disconnect wire con-
nector on the Coil Winding.
9. Remove the Transformer from the unit, carefully
guiding all the connected cables and wires as you
do so.
10. Turn unit onto its left side.
11. Position the replacement Transformer as follows:
a. with the PC Board facing out from the unit;
b. the cables oriented to the right side;
c. the four Transformer Rubber Feet well seated in
the four holes in the Center Chassis.
12. Feed the Transformer wires and cables as follows:
a. White Transformer Cable - feed through bottom
hole in Center Chassis.
b. Black Transformer Cable - feed through hole in
Top of Fan Shroud, then through hole in Center
Chassis below Pilot PC Board.
c. Blue Fan Wires - feed through same hole in Fan
Shroud as Black Cable, then through hole at
right side of Center Chassis.
13. Secure the Main Transformer in position by lock-
ing the two tabs on the bottom of the Shroud into
the Center Chassis. Start with the left side first,
lock it in position, then repeat with the right side.
14. Install the two nuts and washers securing the
Shroud to the Center Chassis.
15. Connect wire connector to the Coil Winding on the
Main Transformer.
16. Reinstall the Pressure Switch/Solenoid Assembly.
17. Reinstall the Fan per Subsection 5.08-B and recon-
nect the wiring.
18. Reconnect cables to the following points on the
Main Power PCB. Refer to the Appendix pages for
wiring details.
• Primary to Main PCB Terminals E4 and E35
• Secondary to Main PCB Terminals E8 and E9
19. Re-install cover per Subsection 5.04-A.