Philips DVP721VR Service Manual page 26

3. Y/C CIRCUIT
(B) Hi-Fi Playback
PB mode
YES
No Sound.
YES
Check the Vcc of IC801
(Pins34, 40)
YES
Check the Hi-Fi Selection switch.
(IC801 Pin41) and the Tape quality.
YES
Is the RF Envelope at
IC801 Pin44 over 2Vp-p?
YES
Check IC801 Pin42(Data),
Pin43(Clock)
YES
Do Audio Signals appear at
IC801 Pin16(L-CH), 17(R-CH)?
YES
Do Audio Signals appear at
IC802 Pin10(L-CH), 16(R-CH)?
YES
Do Audio Signals appear at
IC802 Pins22, 26?
YES
Do Audio Signals appear at
JK902?
NO
Check Power 5.0V, 12VT.
NO
Check IC501 Pin106
(A.H/SW)
NO
NO
Check the parts of µ-COM
(IC501 Pins59, 60)
NO
Check the Connection at
P3D01 Pins7, 9.
NO
Check the A.IN line of
IC802(C855, C856)
NO
Check the Vcc of IC802
Pin4.
Replace IC802.
NO
Check the Jack(JK902)
3-16
NO
YES
Check Power.