Original well scanned manual. Got the job done. Microwave problem found & corrected. For $5 and a new magnitron from ebay, it was a cheap and good the first shot fix. Electrical schematics allowed me to mage sure every thing else was ok before cutting and order for parts. Hard to live without.
Text excerpt from page 5 (click to view)
Dismantling the Grill Base & Speaker Driver
1. Place the Subwoofer Box as shown in the Picture 1 and use a screw driver to force open the Grill Base. Caution: Take care the surface when take out the Grill Base of Subwoofer 2. Place the Subwoofer Box as shown in the Picture 2 and loosen 4 screws A to remove the Speaker Driver.
Dismantling the Front Assembly
1. Place the Subwoofer Box as shown in the Picture 3 (Bottom view) and use a screw driver to force open the front assembly. Caution: Do not break the bundle of wires to the front. Take care the surface when take out the front panel of subwoofer
Dismantling the Rear assembly
1. Loosen 9 screws B as shown in the Picture 4 (Rear View) to pull out the Printed Circuit Board assembly.
Caution: Do not break the bundle of wires to the front.
WARNING: THERE IS ONLY A LED BETWEEN FRONT PANEL AND WOOD BOX. IF NOT NECCESSARY, PLEASE DO NOT TRY TO OPEN THE FRONT PANEL!!!