Sharp VC-S2000HM, Service Manual

Page: 49 / 123

49
VC-S2000HM
FLOW CHART NO.27 DECODER TROUBLESHOOTING
<Hi-Fi Audio Double scart>
MODE
SIG.
DECODER CIRCUIT
SELECT
INPUT SIGNAL
FLOW
SIG.
FLOW
INPUT
(switch)
OUTPUT
OUTPUT SIGNAL
(A)
Pin47 of IC701(Y/C video output) E2(L2) video input Front video input
→
pin7 pin28 pin13
pin25
→
E1(L1) video output 21PIN CONNECTOR
(B) (C)
→ →
(A) (B) (C)
Pin58 of IC6301(Audio output L-ch) E2(L2) audio input(L-ch) Front audio input(L-ch)
→
pin2 pin33 pin11
pin42
→
E1(L1) audio output(L-ch) 21PIN CONNECTOR
→ →
(A)
Pin56 of IC6301(Audio output R-ch) E2(L2) audio input(R-ch) Front audio input(R-ch)
→
pin1 pin34 pin10
pin43
→
E1(L1) audio output(R-ch) 21PIN CONNECTOR
(B)
→
(C)
→
(A)
Tuner video output E1(L1) video input Pin47 of IC701(Y/C video output)
→
pin18 pin23 pin7
pin26
→
E2(L2) video output 21PIN CONNECTOR
(B)
→
(C)
→
(A)
MPX output(L-ch) E1(L1) audio input(L-ch) Pin58 of IC6301(Audio output L-ch)
→
pin16 pin36 pin2
pin30
→
E2(L2) audio output(L-ch) 21PIN CONNECTOR
(B)
→
(C)
→
(A)
MPX output(R-ch) E1(L1) audio input(R-ch) Pin56 of IC6301(Audio output R-ch)
→
pin15 pin37 pin1
pin31
→
E2(L2) audio output(R-ch) 21PIN CONNECTOR
(B)
→
(C)
→
(A) (B) (C) (D)
E2(L2) video input E1(L1) video input Tuner video input Front audio input(L-ch)
→
pin28 pin23 pin18 pin13
pin5
→
Pin31 of IC201 Y/C video input (Tuner/Aux. input)
→ → →
(A) (B) (C) (D)
E2(L2) audio input(L-ch) E1(L1) audio input(L-ch) MPX output(L-ch) Front video input
→
pin33 pin36 pin16 pin11
pin39
→
Pin61 of IC6301 Audio input(L-ch)
→ → →
(A) (B) (C) (D)
E2(L2) audio input(R-ch) E1(L1) audio input(R-ch) Tuner audio output Front audioinput (R-ch)
→
pin34 pin37 pin15 pin10
pin40
→
Pin52 of IC6301 Audio input(R-ch)
→ → →
NO NO NO
YES YES YES
Check STBY 5V line.
Check STBY 12V line.
Check line between pins(21), (22) of IC2501 and pins(17), (18) of IC701.
Is voltage 5V applied to the video section power terminal at pins(24), (29) of IC2501? Is voltage 12V applied to the audio section power terminal at pin(14) of IC2501?
Check signal line from video and audio function logic table as shown below.
Not output from 21pin connector in video and audio signal. Is there SDA and SCL signal applied to pins(21) and (22) of IC2501?