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TS4
((C))
(From page 47)
[INDIVIDUAL MODEM REPAIRS]
↓
<IC5004(P80C52 MODEM controller)
Pin 44:+5V?>
↓
OK
[Replace IC5004(P80C52 MODEM controller) .]
↓
[Execute "No.28 Check MODEM(SET)".]
↓
<Succeeded?>
OK
[End]
(((MA)))
(from this page)
↓
<Replace Q5003/
<Replace Q5001/
Q5004>
Q5002>
NG
↓
↓
OK
[END]
[END]
[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]
48
NG
[Trace +5V supply line.]
NO:"No Carrier" occurs
[Replace IC5001
(73K321L MODEM/AFE IC)]
↓
[Execute "No.28 Check MODEM(SET)".]
↓
<Succeeded?>
OK
<Replace T5001,the
Line Transf.>
NG
↓
OK
OK
[END]
OK
NG
NG
OK
NG
OK
NG
OK
NO:"No Carrier" occurs
[Replace IC5005(BA10324 OP.AMP./
[Execute "No.28 Check MODEM(SET)".]
<Replace IC5003
<Replace IC5002
TLP127>
PC123>
NG
NG
↓
OK
[END]
[End]
[The channel decoder is faulty.]
[The Analog video is faulty.]
[The Analog audio is faulty.]
Hybrid circuit)]
↓
↓
<Succeeded?>
NO:"No Carrier" occurs
↓
OK
((MA)) (See this page)
<Replace RY5001
BSR1014>
NG
↓
↓
OK
OK
[END]
[END]
((D)) (See page 49)
((E)) (See page 50)
((F)) (See page 51)
<Replace the
MAIN Ass'y>
NG
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