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FLOW CHART NO.11 Hi-Fi E-E audio does not operate normally. Check the peripheral circuit of the front input terminal and service it if defective. Is each signal supplied to each pin of IC451 as below? L-ch R-ch Front input terminal Pin(9) Pin(71) Rear input terminal Pin(7) Pin(69) Yes Is the 5V voltage supplied to Pin(5,15,32,36,46) of IC451, and the 9V voltage supplied to Pin(54) of IC451? Yes Is the serial data and the clock signal supplied to Pin(37,38) of IC451? Yes Is the "L" pulse inputted into the Pin(49) of IC451? Yes Is the sub carrier signal (3.58 MHz) inputted to Pin(51) of IC451? Yes Is the audio signal outputted to Pin(78,80) of IC451? Yes Is the audio signal inputted into Pin(3,13) of IC752? Yes Is the audio signal outputted to Pin(4,14) of IC752? Yes No Is approximately 5V voltage supplied to Pin(16) of IC752, and approximately -5V voltage supplied to Pin(7) of IC752? No Yes Check the AL+5V line and the AL-30V line (R777,D777), and service it if defective. No Check the line between Pin(78,80) of IC451 and Pin(3,13) of IC752, and service it if defective. No Replace IC451. No Check the line between the Pin(49) of IC302 and Pin(51) of IC451, and service it if defective. No Check the line between Pin(49) of IC451 and Pin(7) of IC501, and service it if defective. No Check the line between Pin(37,38) of IC451 and Pin(12,13) of IC501, and service it if defective. No No Check the peripheral circuit of the rear input terminal and service it if defective.
No
Check the circuit of AL+5V(1), P-ON+5V and P-ON+9V, and service it if defective.
Is the "H" pulse inputted into the Pins(9,10,11) of IC752? Yes Replace IC752. Is the audio signal outputted to Pin(4,14) of IC751? Yes Check the line between Pin(4,14) of IC751 and the audio output terminal (JK751), and service it if defective. No No Replace IC501.
Is approximately 5V voltage supplied to Pin(16) of IC751, and approximately -5V voltage supplied to Pin(7) of IC751? No Yes Check the AL+5V line and the AL-30V line (R777,D777), and service it if defective.
Is the "H" pulse inputted into the Pins(9,10,11) of IC751? Yes No Replace IC751. Replace IC501.
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E8E62TR
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