Sharp DV-NC200SS Service Manual page 46

FLOW CHART NO.11
Hi-Fi E-E audio does not operate normally.
Is each signal supplied to each pin of IC451 as below?
Front input terminal
Scart jack 1 (JK101)
Scart jack 2 (JK1402)
Tuner audio signal
Is the 5V voltage supplied to Pins(16,32,35,36,46,55) of
IC451, or the 9V voltage supplied to Pin(69) of IC451?
Is the serial data and the clock signal supplied to
Pin(37,38) of IC451?
Is the "L" pulse inputted into the Pin(53) of IC451?
Is the audio signal outputted to Pin(65,67,74,76)
of IC451?
Is the audio signal inputted into Pin(2,12) of
IC751?
Is the audio signal outputted to Pin(14,15) of
IC751?
Check the line between Pin(14,15) of IC751 and
Pin(1,3) of JK101 (Scart jack), and service it if
defective.
Replace IC751.
L-ch R-ch
Pin(8) Pin(54)
Pin(6) Pin(52)
Pin(10) Pin(56)
Pin(4) Pin(50)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Check the peripheral circuit of the front input
terminal and service it if defective.
Check the peripheral circuit of the Scart jack 1
No
(JK101) and service it if defective.
No
No
Check the peripheral circuit of the Scart jack 2
No
(JK1402) and service it if defective.
Is the SIF signal outputted from Pin(22) of the tuner?
Yes
Check the line between Pins(4,
50) of IC451 and Pin(22) of
tuner, and service it if defective.
No
Check the circuit of AL+5V, P-ON+5V and
AL+9V, and service it if defective.
No
Check the line between Pin(37,38) of IC451 and
Pin(71,72) of IC501, and service it if defective.
No
Check the line between Pin(53) of IC451 and
Pin(28) of IC501, and service it if defective.
No
Replace IC451.
No
Check the line between Pin(74,76) of IC451 and
Pin(2,12) of IC751, and service it if defective.
No Is approximately 5V voltage supplied to Pin(16)
of IC751, or approximately -5V voltage supplied to
Pin(7) of IC751?
Check the AL+5V line and the AL-30V line
Yes
(R764, D111), and service it if defective.
Yes
Is the "L " pulse inputted into the Pins(9,10,11) of
IC751?
Replace IC501.
1-11-14
No
Replace the
tuner.
No
No
H9941TS