I PURHASED THIS PRODUCT BECAUSE I WAS HAVING PROBLEMS WITH MY CDR20 HARMAN KARDON RECORDER. WHICH I PURCHASED NEW 12 YEARS AGO. AFTER REVIEWING THE MANUAL, I WAS ABLE TO ADJUST THE TENSIONER IN THE SYSTEM. WORKS LIKE A CHAMP!.
SAVED ME AT LEAST 100.00 WHICH WAS WHAT A SERVICE REPAIR STATION WANTED. GREAT MANUAL EASY TO READ. SPECIALLY AFTER I PRINTED THE PAGES WHICH DEALT WITH MY RECORDER. THANKS A LOT!!!!!!!!
I have never bought a service manual which is as competely readable as this althogh it was a scanned pdf. Thank you for this succesful manual also cheaper than other sites.
Text excerpt from page 10 (click to view)
NN-P795 NN-P794SFR
4 SIMPLE WAY OF H.V. INVERTER/MAGNETRON TROUBLESHOUTING
Purpose: Simple way (3/23 seconds rule) of identifying whether it�s Magnetron, Inverter, or others. Set-up: The unit under question is connected through the Ammeter as shown below.
Procedure: Follow the matrix table below to identify the problem source. Note: Do not replace both Inverter board and Magnetron simultaneously and automatically without going through this procedure.
Power will: Ammeter reading is: Shut off in 23 seconds 1. Between 0.5A and 1.0A. after �Start�. 2. Between 1.0A and 2.0A. To do: Remedy: Check and repair open magnetron circuit Open magnetron wiring between Inverter and magnetron terminal. Check continuity of D702 in Inverter PCB.
1. D702 shorted
Shut off in 3 seconds 1. Less than 0.5A after �Start�
Replace H.V.Inverter (F606Y6G00AP/F606Y6G00CP) 2. D702 is OK Replace magnetron Check open circuit: Latch Switch, DPC, Replace defective component(s), or Power Relay and CN701 correct switch, cables and connectors.