SONY WRR-802A
Manual de Servicio

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2-4-2. Tuner Unit Checking
The following procedures describe how to prove the tuner unit of WRR-802A (repair unit) whether it needs to be repaired or not. Equipment Required : MB-806A (quality unit) WRU-806A (quality unit) (1) Install the repair tuner unit to be examined in a quality MB-806A. (2) Check the fault with a quality MB-806A. . If there is no fault, it is considered that the tuner unit is no longer defective. Restore the tuner unit to its original WRR-802A (repair unit). Check all components other than the tuner unit, such as MB-872 board, CN-1922 board, CN-1923 board, harness, etc., then fix a faulty section. . If there is a fault, tuner unit is defective. Check the tuner unit then fix a faulty section, and perform �3. Electrical Alignment�. (3) In order to prove the whole WRR-802A, change the tuner unit of the repairing WRR-802A with WRU-806A (quality unit). (4) Check the fault of repairing WRR-802A. . If there is no fault found on the repairing WRR-802A, tuner unit is defective. . If there is a fault, it is considered that both the tuner unit and other components, such as MB-872 board, CN-1922 board, CN-1923 board, harness, etc., are defective. Check all components then fix a faulty section.

WRR-802A (U)

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