Read Sharp DV-NC65H (serv.man15) Service Manual online
58
DV-NC65H/S
DV-NC70H
DV-NC70H
FLOW CHART NO.22
NO
Check the peripheral circuit of front input terminal.
L-ch
R-ch
Front input terminal (L3)
Rear input terminal (L1, L2)
YES
NO
YES
YES
NO
Tuner audio terminal
YES
YES
NO
NO
NO
NO
NO
• Check the peripheral circuit of rear input terminal.
• Check the peripheral circuit of IC2501.
Check the regulator circuit of Hi-Fi 5V and PC 9V.
Replace IC651.
NO
Is there signal inputted at each
terminal of IC651 as shown in table?
pin(15)
pin(10)
pin(14)
pin(9)
DVD audio
pin(1), (2)
pin(3), (4)
Is the voltage 5V applied to pin(40) of IC651,
9V applied to pin(58)?
Are serial data and clock signal at pins(42),
(43) of IC651?
Line output terminal connection:
Is the audio signal outputted respectively to the
pins(53) and (57) of IC651?
•
VCR/DVD OUT Line output terminal connection:
Check line between VCR/DVD OUT audio output
terminal (J1202) and pins(53), (57) of IC651.
• LINE1, LINE2 output terminal connection:
Is the audio signal input at pins(1), (2) of IC2501.
Is the audio signal output at pins(42), (43) and
(30), (31)?
Check line between pins(53), (57) of IC651 and
pins (1), (2) of IC2501.
Check the peripheral circuit of IC2501 or
replace IC2501.
Check line between LINE1, LINE2 audio output
terminal (SC2501) and pins(42), (43) and (30), (31).
Is "L" level applied at pin(36) of IC651?
Is "H" level applied at pin(28) of IC651?
Check line between pins(42), (43) of IC651
and pins(17), (18) of IC701.
YES
NO
Check line between pin(36) of IC651 and
pin(81) of IC701.
Is Sub carrier signal (4.43 MHz, about 900 mVp-p)
inputted to pin(45) of IC651?
Check line between X501 and pin(45) of IC651.
•
Is there SIF signal inputted to IC1701 from pin(22)
of Tuner?
No Hi-Fi E-E sound heard.
YES
YES
FLOW CHART NO.23
NO
YES
NO
YES
NO
YES
NO
Is terminal voltage (REC AGC. ADJ.) pin(37) of
IC651 normal?
Is record FM signal outputted to the pins(21)~(24)
(ch-1)/pins(21) and (22) (ch-2) of IC651?
Check the AH-MZ connector.
Replace IC651.
Is the pin(29) of IC651 about 3.7V?
Check Hi-Fi REC CTL line.
Is voltage 5V applied to the pin(25) of IC651?
Check line of Hi-Fi 5V.
Hi-Fi sound cannot be recorded (E-E mode is normal).
FLOW CHART NO.24
NO
YES
NO
YES
Is playback envelope signal outputted to the pins(29)
and (30) of IC651? (300 mVp-p)
Replace IC651.
Replace IC651.
Is A-H.SW.P input into the pin(27) of IC651?
Check the A-H.SW.P. line from the pin(27) of
IC651 to the pin(26) of IC701.
Hi-Fi sound cannot be played back (E-E mode is normal).
FLOW CHART NO.25
NO
YES
NO
YES
YES
Is audio signal inputted into the IC201 pin(8) and
pin(9)?
pin(8) : LINE input terminal
pin(9) : U/V tuner audio input
Does the bias oscillation circuit operate normally?
Is audio signal on which bias signal is superposed
outputted to the pin(4) of IC201?
Check the AA-MH harness and A/C head.
Check the bias oscillation circuit (T601, Q602,
Q603).
• Check the line between the pin(61) of IC651 to the
pin(8) of IC201.
• Check the line between the pin(21) of TU101 and
the pin(9) of IC201.
Recording in linear audio is impossible (Hi-Fi E-E mode is normal).
FLOW CHART NO.26
NO
NO
YES
YES
YES
PAL EP ONLY
YES
NO
YES
NO
YES
Is it possible to confirm the audio signal (PB EQ)
on the pin(100) of IC201?
Is audio signal output to the pin(11) of IC201?
Check the line between the pin(11) of IC201 to
the pin(62) of IC651.
Are MH-AA harness and playback AMP. peripheral
parts normal?
Is the A/C head surface clean?
Is A/C head height adjusted properly?
Replace the A/C head.
Readjust the A/C head height.
Replace IC201.
Are there signal at the pin(1) of IC601?
Linear audio playback is impossible. (Hi-Fi E-E mode is normal).
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