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 12 (click to view)
Item
Code No.
Parts Name Battery/Silver oxide
Specification SR621W
Applicable QW-1656/1657/1678Common
QR 1
For the prices and minimum order/supply quantities of the above parts, refer to the Parts Price List P.P.L.-522.