Amana URCS511A Operations Instructions download pdf (Page 23)

Disassembly Procedures

To avoid risk of electrical shock, personal injury, or

death, disconnect power to oven and discharge

capacitors before following any disassembly procedure.

WARNING

Removal of Power Transformer, Capacitor

and Diode (Rectifier)

1. Disconnect power to oven.

CAUTION

Failure to comply with earthing instructions may result

in personal injury due to electrical shock.

2. Remove outer case. Earth magnetron terminals to

capacitor housing with an insulated-handle

screwdriver by touching metal shaft first to the

capacitor housing then to the capacitor terminals.

NOTE: When reinstalling, see “Item 7 Note, Magnetron

Removal” or high voltage component failure may

result.

3. Disconnect and label wire terminals and remove

appropriate component mounting screw(s).

4. If installing a new diode see wiring diagrams for

correct connection.

5. When installing new capacitor, spacing from the can

to terminals or diode must be a minimum of

/4"

(6mm) or arcing will occur.

Magnetron Removal

• Magnetron assembly used in oven covered in this

manual is made up of the magnetron, permanent

magnets, housing, filter box, and R.F. Capacitors. It

can only be replaced as an assembly.

CAUTION

Failure to earth capacitor may result in injury due to

electrical shock. Capacitor terminals must be earthed

prior to performing maintenance in high voltage section.

1. Disconnect power to oven.

2. Remove outer case, see “Outer Case Removal”

procedure.

3. Disconnect magnetron leads after discharging them

to magnetron capacitor housing.

4. Remove magnetron by loosening nuts securing

magnetron studs to oven top and carefully remove

the tube assembly.

NOTE: These are 8mm locknuts.

5. If add-on parts are in good usable condition (thermal

cutouts, nuts, etc.), install them on the new tube

assembly. Record tube serial numbers. Tube

serial number is located on the bottom of housing.

Also record complete part number with suffix

letters and correct failure code.

6. Check replacement magnetron to ensure top wire

mesh gasket is installed.

7. Microwave ovens covered by this manual have a high

voltage circuit used in conjunction with the permanent

magnet (PM) magnetron tube assembly. To ensure

proper phasing of the complete high voltage

secondary circuit, transformer and magnetron tube

leads must be connected as shown in the wiring

diagram.

CAUTION

Failure to connect the components in this manner may

cause premature failure of the diode or other high

voltage failures.

8. To replace magnetron tube, insert antenna portion of

the tube assembly into the waveguide and while

holding magnetron tube assembly firmly against the

waveguide, loosely reinstall nuts securing magnetron.

Tighten nuts evenly to ensure proper sealing of the

wire mesh gasket.

NOTE: Filament leads must be connected as shown in

the wiring diagram to eliminate problems of high

voltage and component failures (usually diode/

short protector).

CAUTION

When connecting filament lead wires to the magnetron

terminals, be sure to connect lead wires in the proper

position. The # 5 lead wire from filament transformer

should be connected to “FA” terminal and lead wire

from high voltage capacitor should be connected to “F”

terminal.

9. Reconnect magnetron leads and install thermal

switch.

CAUTION

Quick connect junctions must be tight. Failure to

correct loose terminal will lead to further tube and/or

terminal failure.

10.Reinstall outer cabinet.

WARNING

This unit must be unplugged to avoid electrical shock,

personal injury or death when working on the

microwave oven except when taking meter readings

requiring live voltage.

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Amana URCS511A Operations Instructions Page 23

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