Sharp DV-NC70U Service Manual - Page 47

DV-NC70U/C DV-NC72U 47 FLOW CHART NO.22 No Hi-Fi E-E sound heard. Is there signal inputted at each terminal of IC651 as shown in table? NO Front input terminal Rear input terminal Tuner audio terminal DVD audio L-ch pin(15) pin(14) pin(48) R-ch pin(10) pin(9) NO NO pin(1), (2) YES Is the voltage 5V applied to pin(40) of IC651, NO 9V applied to pin(58)? YES Are serial data and clock signal at pins(42), NO (43) of IC651? YES NO Is "L" level applied at pin(36) of IC651? YES NO Is "H" level applied at pin(28) of IC651? YES Line output terminal connection: NO Is the audio signal outputted respectively to the pins(53) and (57) of IC651? YES Line output terminal connection: Check line between audio output terminal and pins(53), (57) of IC651. Check the peripheral circuit of front input terminal. Check the peripheral circuit of rear input terminal. Is there SIF signal from pin(22) of Tuner? Check the regulator circuit of Hi-Fi 5V and PC 9V. Check line between pins(42), (43) of IC651 and pins(17), (18) of IC701. Check line between pin(36) of IC651 and pin(81) of IC701. Is Sub carrier signal (3.58 MHz, about 900 mVp-p) inputted to pin(45) of IC651? NO Check line between X501 and pin(45) of IC651. Replace IC651. FLOW CHART NO.23 Hi-Fi sound cannot be recorded (E-E mode is normal). NO Is terminal voltage (REC AGC. ADJ.) pin(37) of IC651 normal? YES NO Is record FM signal outputted to the pins(21)~(24) (ch-1)/pins(21) and (22) (ch-2) of IC651? YES Check the AH-MZ connector. FLOW CHART NO.24 Hi-Fi sound cannot be played back (E-E mode is normal). NO Is playback envelope signal outputted to the pins(29) and (30) of IC651? (300 mVp-p) YES Replace IC651. FLOW CHART NO.25 Recording in linear audio is impossible (Hi-Fi E-E mode is normal). Is audio signal inputted into the IC201 pin(8)? NO YES NO Does the bias oscillation circuit operate normally? YES Is audio signal on which bias signal is superposed outputted to the pin(4) of IC201? YES Check the AA-MH harness and A/C head. FLOW CHART NO.26 Linear audio playback is impossible. (Hi-Fi E-E mode is normal). NO Is it possible to confirm the audio signal (PB EQ) on the pin(100) of IC201? YES NO Is audio signal output to the pin(11) of IC201? NO YES Check the line between the pin(11) of IC201 to the pin(62) of IC651. Replace IC651. YES Is the pin(29) of IC651 about 3.7V? NO Check Hi-Fi REC CTL line. Is voltage 5V applied to pin(25) of IC651? NO Check line of Hi-Fi 5V. Replace IC651. YES Is A-H.SW.P input into the pin(27) of IC651? NO Check the A-H.SW.P. line from the pin(27) of IC651 to the pin(26) of IC701. Check the line between the pin(61) of IC651 to the pin(8) of IC201. Check the bias oscillation circuit (T601, Q602, Q603). Are MH-AA harness and playback AMP. peripheral parts normal? YES Is the A/C head surface clean? YES Is A/C head height adjusted properly? YES Replace the A/C head. Readjust the A/C head height. Replace IC201.