SERVICE TROUBLESHOOTING
28
Manual 0-2587
A-01423
E16
E18
E19
E17
E14
E15
b. Place the meter (+) lead on E16 and the meter (-)
lead on E18 of the FET/Heatsink Assembly to
check the output rectifier forward bias. The meter
should indicate between 0.3 to 0.6 volts using the
diode function or 100K ohms using the ohms func-
tion.
c. Place the meter (+) lead on E18 and the meter (-)
lead on E16 of the FET/Heatsink Assembly to
check the output rectifier reverse bias. The meter
should indicate 'OL' using the diode function or
100K ohms using the ohms function.
d. Place the meter (+) lead on E17 and the meter (-)
lead on E19 of the FET/Heatsink Assembly to
check the output rectifier forward bias. The meter
should indicate between 0.3 to 0.6 volts using the
diode function or 100K ohms using the ohms func-
tion.
e. Place the meter (+) lead on E19 and the meter (-)
lead on E17 of the FET/Heatsink Assembly to
check the output rectifier reverse bias. The meter
should indicate 'OL' using the diode function or
100K ohms using the ohms function.
f. Place the meter (+) lead on E18 and the meter (-)
lead on the heatsink of the FET/Heatsink Assem-
bly to check the output rectifier resistance to
ground. The meter should indicate >1 meg ohms.
Replace the FET/Heatsink Assembly if any of the
above tests are open or shorted.
6. FET Output Clamp Diodes Check
Use an ohmmeter to check the resistance of the out-
put clamp diodes, (+ out) E17 and (- out) E18, per the
following procedure:
NOTE
The wires on E16 and E18 should still be discon-
nected from both FET/Heatsink Assemblies.
a. Place the meter (+) lead on E17 and the meter (-)
lead on E18 of the FET/Heatsink Assembly to
check the output clamp diode resistance. The
meter should indicate >1 meg ohms.
b. Place the meter (+) lead on E18 and the meter (-)
lead on E17 of the FET/Heatsink Assembly to
check the output clamp diode resistance. The
meter should indicate >1 meg ohms.
Replace the FET/Heatsink Assembly if any of the
above tests are open or shorted.
Summary of Contents for Thermal Dynamics PAK MASTER 50XL
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Page 16: ...INTRODUCTION 10 Manual 0 2587...
Page 45: ...Manual 0 2587 39 PARTS LISTS A 01381 2 1 3 4 5 2...
Page 47: ...Manual 0 2587 41 PARTS LISTS A 01065 1 2 3 4 5 6 7 8...
Page 49: ...Manual 0 2587 43 PARTS LISTS A 01382 2 4 1 3 5...
Page 53: ...Manual 0 2587 47 PARTS LISTS A 01068 1 6 2 14 12 16 10 15 9 8 7 3 5 5 4 13 17 11...
Page 55: ...Manual 0 2587 49 PARTS LISTS A 01383 14 6 2 11 13 15 7 12 3 8 10 9 4 1 5...
Page 72: ...APPENDIX 66 Manual 0 2587 APPENDIX XII SYSTEM SCHEMATIC A 01370 1 2 1 2...
Page 73: ...Manual 0 2587 67 APPENDIX A 01370 B EC 8055 HAS 11 23 98...
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