Service Information Of Tuner Unit - Sony WRR-800A Service Manual

2-6. SERVICE INFORMATION OF TUNER UNIT

There are no component level service available for the WRR-800A's tuner unit (compatible with WRU-801A) except the
followings. Therefore, be sure to replace whole tuner unit WRU-801A when make a servicing in the component level
(Refer to following "TUNER UNIT CHECKING").
Available parts for the tuner unit
Part No.
A-8317-231-A
A-8317-232-A
1-783-026-11
2-545-180-01
TUNER UNIT CHECKING
The following procedures describe how to prove the tuner unit of WRR-800A (repair unit) whether it needs to be repaired
or not.
Equipment Required : WRR-801A(quality unit)
(1) Install the repair tuner unit to be examined in a quality WRR-801A.
(2) Check the fault with a quality WRR-801A.
. If there is no fault, it is considered that the tuner unit is no longer defective.
Restore the tuner unit to its original WRR-800A (repair unit). Check all components other than the tuner unit, such as
MB-786 board, CN-1598 board, harness, etc., then fix a faulty section.
. If there is a fault, tuner unit is defective.
To fix the tuner unit, perform "3. Electrical Alignment." If it is impossible to fix the tuner unit, replace it with a new
tuner unit (WRU-801A).
(3) In order to prove the whole WRR-800A, change the tuner unit of the repairing WRR-800A with tuner unit of
WRR-801A(quality unit).
(4) Check the fault of repairing WRR-800A.
. If there is no fault found on the repairing WRR-800A, tuner unit is defective.
. If there is a fault, it is considered that both the tuner unit and other components, such as MB-768 board, CN-1598
board, harness, etc., are defective. Check all components then fix a faulty section.
2-4
SP Description
s F case assembly
s LCD assembly
s Flat cable (33 wires)
s Lid
WRR-800A