CUTMASTER 102
SERVICE
Manual 0-4998
5-22
F. PCB 5 IGBT Test
1. Disconnect transformer wires from 40 Amp PCB 5
terminal PRI 1 (A).
2. Using an ohmmeter perform the following checks:
PCB 5 - Q1
Test points located on PCB 2 AND PCB 5*
Meter (+)
Meter (-)
Indication
PRI 1*
PMTH 1
Forward Bias
PRI 1*
PMTH 2
Capacitor Charging
PMTH 1
PRI 1*
Capacitor Charging
PMTH 2
PRI 1*
Forward Bias
PRI 2*
PMTH 1
Forward Bias
PRI 2*
PMTH 2
Capacitor Charging
PMTH 1
PRI 2*
Capacitor Charging
PMTH 2
PRI 2*
Forward Bias
3. Disconnect transformer wire from 40 Amp PCB 5
terminal PRI4 (C).
4. Using an ohmmeter perform the following checks:
PCB 5 – Q2
Test points located on PCB 2 AND PCB 5*
Meter (+)
Meter (-)
Indication
PRI 4*
PMTH 3
Forward Bias
PRI 4*
PMTH 4
Capacitor Charging
PMTH 3
PRI 4*
Capacitor Charging
PMTH 4
PRI 4*
Forward Bias
PRI 3*
PMTH 3
Forward Bias
PRI 3*
PMTH 4
Capacitor Charging
PMTH 3
PRI 3*
Capacitor Charging
PMTH 4
PRI 3*
Forward Bias
G. PCB 1 Output Diode D3 Test
1. Disconnect transformer wires from Main PCB 1 termi-
nal SEC1.
2. Using an ohmmeter perform the following checks:
PCB 1 D3
(Test points located on PCB 1* & PCB 2)
Meter (+)
Meter (-)
Indication
CHOKE1
SEC1
Forward Bias
CHOKE1
SEC2
Forward Bias
SEC1
CHOKE1
Reversed Bias
SEC2
CHOKE`
Reversed Bias
WORK1
SEC1
Reversed Bias
WORK1
SEC2
Reversed Bias
SEC1
WORK1
Forward Bias
SEC2
WORK1
Forward Bias
H. PCB 5 Output Diode D2 Test
1. Disconnect transformer wires from Main PCB 5 termi-
nal SEC1.
2. Using an ohmmeter perform the following checks:
PCB 5 – D2
Test points located on PCB 5
Meter (+)
Meter (-)
Indication
CHOKE1
SEC1
Forward Bias
CHOKE1
SEC2
Forward Bias
SEC1
CHOKE1
Reversed Bias
SEC2
CHOKE1
Reversed Bias
+OUT_1
SEC1
Reversed Bias
+OUT_1
SEC2
Reversed Bias
SEC1
+OUT_1
Forward Bias
SEC2
+OUT_1
Forward Bias
I. PCB 1 Pilot IGBT Test
1. Disconnect wire E35 from Main PCB 1 terminal TIP1.
2. Using a multimeter with a diode test scale, place the
positive probe on PCB 1 terminal TIP1 and the nega-
tive probe on PCB 1 terminal WORK1 and check for a
forward Biased diode reading.
3. If the test reveals a failed component, replace Main PCB
1. If no problem is found, reconnect wire to Main PCB.
J. PCB 2 Capacitor / Relay Test (with PCB 2
removed from the unit)
1. Using an ohmmeter perform the following checks:
PCB 2 Capacitor & Relay Test
Meter +
Meter -
Indication
MTH 2
MTH 4
Charging
MTH 8
MTH 7
Charging
MTH 7
MTH 4
Open
MTH 8
MTH 2
Open
MTH 8
MTH 4
Open
Most meters will show a charging action. Initially a low
resistance will be shown and then the resistance will start
to increase. If the meter probes are reversed the reading
will decrease to zero, then start charging in the opposite
polarity.
2. If test reveals a failed component, replace Capacitor
PCB 2.
Содержание CUTMASTER 102
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