Tweco CutMaster 101 with SL100SV User Manual
Page 91
Manual 0-4642
5-27
SERVICE
5
C. Diode Module Board Tests
WARNING
Disconnect primary power at the source before taking any resistance checks.
1. Input Diode Test
a. Disconnect input AC power.
b. Check Input Diode for shorted input diode. With an ohmmeter set on the diode range make the following checks from
Main PC Board to Input Diode:
For 400-Volt, 415-Volt, 460-Volt, and 600-Volt Power Supplies: For 208/230-Volt Power Supplies:
Meter +
Meter -
Indication
E15
E1
Diode Drop
E1
E15
Open
E15
E2
Diode Drop
E2
E15
Open
E15
E3
Diode Drop
E3
E15
Open
E7
E1
Open
E1
E7
Diode Drop
E7
E2
Open
E2
E7
Diode Drop
E7
E3
Open
E3
E7
Diode Drop
E7
E15
Open
E15
E7
Diode Drop*
400V, 415V, 460V, and 600V
Input Diode Indications
* Indication can be twice
other indications.
Meter +
Meter -
Indication
E7
E1
Open
E1
E7
Diode Drop
E15
E1
Diode Drop
E1
E15
Open
E15
E7
Diode Drop*
E7
E15
Open
208/230V Input Diode Indications
* Indication can be twice
other indications.
c. The meter should indicate a diode drop in one direction and an open in the other direction for each check. Replace the
Input Diode Module Board if the readings do not match the chart.
d. If Input Diode Module Board is shorted, make the following checks with an ohmmeter at the Main Contactor (W1):
Meter (+)
Meter (-) Indication
L1
T1
Open
L2
T2
Open
L3
T3
Open
If any test has resistance, then replace the Main Contactor.