Wave 300 XL – Power Supply Repair

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Table Of Contents 1. Dismantling the Power Supply ....................................................................................................... 2

2. Power supply Repair Flow Chart .................................................................................................... 6

3. Main Cable Test ........................................................................................................................... 7

4. Switch Test .................................................................................................................................... 8

5. Capacitor Test ............................................................................................................................. 10

6. PCB and Bulgin Test .................................................................................................................... 11

7. Fuse Test ...................................................................................................................................... 12

8. Diode Bridge Test ......................................................................................................................... 13

9. Transformer Test ......................................................................................................................... 15

Caution: Only an experienced technician should open and

analyze the Wave 300 XL power supply. Power supply units

can retain dangerous voltage and must be discharged.

Wave 300 XL – Power Supply Repair

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1. Dismantling the Power Supply

Step 1.1

Disconnect the main

AC plug from the outlet.

Step 1.2

Disconnect the

MMI cable.

Wave 300 XL – Power Supply Repair

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Step 1.3

Disconnect the

Bulgin plug.

Step 1.4

Unscrew the four

caddy bolts from

the power supply.

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Step 1.5

Remove the power

supply from the

caddy.

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Step 1.6

Unscrew the 10

base screws.

Step 1.7

Open the power

supply.

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2. Power supply Repair Flow Chart

Turn ON the power supply switch,

Does it turn on?

Check the main

electric power socket

Check the main cable

(page 7)

Check the power

supply switch

(pages 8-9)

Check voltage of

capacitor’s poles

(page 10)

Check the PCB outlet

connector

(page 11)

Check the Bulgin socket

(page 11)

Check the diode bridge

(pages 13-14)

Check the transformer

(page 15)

Check the fuse

(page 12)

No YesShort circuits (“trips”) /

switch disconnects?

Wave 300 XL – Power Supply Repair

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3. Main Cable Test

Step 3.1

Make sure the main

cable is disconnected

from the main power

socket.

Step 3.2

Disconnect the main

AC wires from the

switch.

Step 3.3

Connect the

multimeter to the AC

terminals.

Make sure to hold the

terminals only by the

isolated red covers.

Step 3.4

Plug the main plug

into the power source.

Reading should be

~230 Volts / ~110

Volts based on your

location. If no power is

registered, replace the

cable.

Step 3.4

Disconnect the main

plug from the power

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4. Switch Test

Step 4.1

Make sure the main cable

is disconnected from the

main power socket.

Step 4.2

Disconnect all four wires

from the switch.

Step 4.3

Turn ON the switch.

Wave 300 XL – Power Supply Repair

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Step 4.4

Check continuity at

the upper poles.

Step 4.5

Check continuity at

the lower poles.

Step 4.6

Connect wires to the

switch poles in the

correct position.

(see Step 4.1)

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5. Capacitor Test

Step 5.1

Connect the main

cable to a mains

source.

Step 5.2

Turn ON the power

supply switch.

Step 5.3

Touch the multimeter

leads to both poles of

the capacitor.

The reading should

be around 47 VDC.

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6. PCB and Bulgin Test

Step 6.1

Touch the multimeter

leads to the white &

black wire screws of

the PCB outlet plug.

The reading should

be around 47 VDC.

Step 6.2

Touch the multimeter

leads to the white &

black terminals

(under the centered

slot).

The reading should

be around 46 VDC.

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7. Fuse Test

Step 7.1

Unscrew the fuse cover and

pull out the fuse.

Step 7.2

Set your multimeter to the

continuity test.

Step 7.3

Check the fuse.

Replace it if no continuity is

detected.

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8. Diode Bridge Test

Step 8.1

Disconnect the main cable.

Step 8.2

Disconnect the wires from

the diode bridge.

Step 8.3

set your multimeter to the

diode setting or

continuity/ohms test.

Step 8.4

Check each pair of poles

twice, while twisting the

leads between the poles.

The first test should show

continuity.

The second test should

show lack of continuity.

Wave 300 XL – Power Supply Repair

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Wave 300 XL – Power Supply Repair

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9. Transformer Test

Step 9.1

Disconnect the main

cable.

Step 9.2

Disconnect the wires from

the diode bridge.

Step 9.3

Connect the main cable

to the power source.

Step 9.4

Turn ON the switch.

If the transformer is

defective (i.e. short

circuits), the switch

(which also acts as a

semi-automatic circuit

breaker) will”trip”.