Miele H 408 BM Series Technical Information page 41

H 408x BM
3. Check for 120VAC between ST1 (pin 2) and ST6 (pin 10) on the power
electronic (1N1).
a. If 120VAC is present, proceed to Section 4.18.2.
b. If 120VAC is NOT present, proceed to step 4 below.
4. Check for 120VAC between ST1 (pin 2) on the power electronic (1N1)
and ST1 (pin 3) on the fuse electronic (3N1).
a. If 120VAC is present, fault is within switch 1F6 and/or 2F6.
b. If 120VAC is NOT present, proceed to step 5 below.
5. Check for 120VAC between ST1 (pin 2) on the power electronic and ST1
(pin 4) on the EV790 fuse electronic (3N1).
a. If 120VAC is present, disconnect the appliance from power, replace
fuse F8 on the EV790 fuse electronic (3N1) and locate the cause of
fuse failure by disconnecting voltage to the appliance and performing
a continuity check of all four door switches. Replace the appropriate
component(s) before restoring power to the appliance.
b. If 120VAC is NOT present, recheck for proper supply voltage at the
terminal block.
4.18.2 Door Switch 3F6 and 4F6 Test
1. Check for 240VAC between ST6 (pin 10) on the power electronic (1N1)
and the input (single blue) wire on the magnetron thermostat (F1/2).
a. If 240VAC is present, proceed to step 2 below.
b. If 240VAC is NOT present, proceed to step 3 below.
2. Check for 240VAC between ST6 (pin 10) on the power electronic and the
output (double blue) wire on the magnetron thermostat (F1/2).
a. If 240VAC is present, proceed to Section 4.18.3.
b. If 240VAC is NOT present, replace F1/2 (magnetron thermostat).
3. Check for 240VAC between ST6 (pin 10) on the power electronic (1N1)
and L2 on the terminal block (X3/1).
a. If 240VAC is present, fault is within switch 3F6 and/or 4F6.
b. If 240VAC is NOT present, recheck for proper supply voltage at the
terminal block.
4.18.3 High-Voltage Component Tests
1. Disconnect the appliance from the power (unplug/shut off circuit breaker).
2. Discharge the high-voltage capacitor. Refer to Section A-2.
3. Unplug ST6 from the power electronic (1N1) and unplug ST1 from the
fuse electronic (3N1).
4. Perform a continuity check of the orange wire between connector ST6
(pin 7) and connector ST1 (pin 1) that was connected to the fuse
electronic (3N1).
a. If continuity is present (wire is okay), proceed to step 5.
b. If continuity is NOT present, repair the break in the wiring.
5. Reconnect ST6 to the power electronic and ST1 to the EV790 fuse
electronic (3N1).
6. Check for approximately 56Ω across resistor R34 (R1) on the EV790 fuse
electronic (3N1).
a. If the resistance is within reasonable range (+/- 10%), proceed to step 7.
b. If the resistance is NOT within range, replace the EV790 fuse electronic
(including the resistor) (3N1).
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Technical Information