JVC HR-XV45SEF Service Manual page 49

(C)
Hi-Fi REC.
YES
It can't be recorded Hi-Fi Audio
signal.
YES
Check Vcc of IC801.(Pins34, 40)
YES
Check IC801 Pin42(Data), Pin43(CLOCK).
YES
Do Audio signals appear at IC801
Pins16, 17?
YES
Do FM Audio signals appear at IC801
Pin36?
YES
Check the Contact Point of Drum
Connector if good then Replace the Drum.
NO
Check Power 5V, 12V.
NO Check ports of
(IC501 pins 17, 18)
Check Audio input signal of IC801
NO
Pins2, 3(TU.A.), 4, 5(DVD.A.),
6, 7(AVI.A.), 8, 9(AV2.A.), 10, 11(AV3.A.).
NO
Replace IC801.
-COM.
(No.YD070)1-49