Pioneer TS4 Service Manual page 50

TS4
[Analog Video section]
↓
[The PAL/SECAM output is faulty.]
↓
[Examine IC4001
(STV6411A:Audio/Video Switch)
CVBS input.]
(R4143*/IC4001: Pin 36:CVBS)
*See bottom side
↓
<Composite video signal:correct?>
↓
[Examine IC4001(STV6411A:Audio/Video
Switch) CVBS output.]
(IC4001: Pin 3: CVBS_OUT)
↓
<How is the result?>
↓
OK
[Around Analog video portion is faulty.]
↓
[The RGB output is faulty.]
↓
[Examine IC4001(STV6411A:Audio/Video
Switch) RGB input.]
(IC4001: Pin 42 :R , IC4001: Pin 44 :G , IC4001:
Pin 46 :B)
↓
<Are they OK?>
↓
YES
[Examine IC4001(STV6411A:Audio/Video
Switch) RGB output.]
(IC4001: Pin 1 :R(C) , IC4001: Pin 63 :G ,
IC4001: Pin 61 :B)
↓
<How is the result?>
↓
OK
[Around the Analog video portion is faulty.]
50
((E))
NG
[Replace the
MAIN Ass'y]
NG
[Replace IC4001]
NO
[Replace the
MAIN Ass'y]
NG
[Replace IC4001]
(From page 48)
↓
[The Y/C output is faulty.]
↓
[Examine IC4001(STV6411A:Audio/Video
Switch) Y/C input.]
(R4144*/IC4001: Pin 38 :Y , R4145*/IC4001:
Pin 40 :C)
*See bottom side
↓
<How is the result?>
↓
OK
[Examine IC4001(STV6411A:Audio/Video
Switch) Y/C output.]
(IC4001: Pin 7: Y_OUT, IC4001: Pin 5: C_OUT)
↓
<How is the result?>
↓
OK
[Around Analog video portion is faulty.]
NG
[Replace the
MAIN Ass'y]
NG
[Replace IC4001]