Pioneer TS4, Service Manual, Page: 48 / 71

TS4
48
((C))
[INDIVIDUAL MODEM REPAIRS]
↓
<IC5004(P80C52 MODEM controller)
Pin 44:+5V?>
↓
[Replace IC5004(P80C52 MODEM controller) .]
↓
[Execute "No.28 Check MODEM(SET)".]
↓
<Succeeded?>
[End]
NO:"No Carrier" occurs
[Replace IC5001
(73K321L MODEM/AFE IC)]
↓
[Execute "No.28 Check MODEM(SET)".]
↓
<Succeeded?>
NO:"No Carrier" occurs
[Replace IC5005(BA10324 OP.AMP./
Hybrid circuit)]
↓
[Execute "No.28 Check MODEM(SET)".]
↓
<Succeeded?>
↓
NO:"No Carrier" occurs
((MA))
(See this page)
[Trace +5V supply line.]
OK
OK
OK
OK
NG
(((MA)))
↓
<Replace Q5003/
Q5004>
↓
[END]
<Replace Q5001/
Q5002>
↓
[END]
<Replace T5001,the
Line Transf.>
↓
[END]
<Replace IC5003
TLP127>
↓
[END]
<Replace IC5002
PC123>
↓
[END]
<Replace RY5001
BSR1014>
↓
[END]
<Replace the
MAIN Ass’y>
OK OK OK OK OK OK
NG NG
NG
NG
NG
NG
[Analog video,analog audio,tuner receiving checks]
↓
<Picture,sound?>
↓
[Connect the PC and setup "main.exe"environment.]
↓
[Confirm RF correct incoming signal with a good IRD.]
↓
<Execute "No.7:Tuner Check" operation.>
↓
<Picture check>
↓
<Sound check>
↓
[End]
[The channel decoder is faulty.]
[The Analog video is faulty.]
[The Analog audio is faulty.]
[End]
((D)) (See page 49)
((E)) (See page 50)
((F)) (See page 51)
OK
NG
OK
OK
OK
NG
NG
NG
(From page 47)
(from this page)