Hitachi DV-PF7E - Page 43

3-16
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.
Check the peripheral circuit of the Scart jack 1
(JK101) and service it if defective.
Check the peripheral circuit of the Scart jack 2
(JK1402) and service it if defective.
Check the circuit of AL+5V, P-ON+5V and
AL+9V, and service it if defective.
Is the SIF signal outputted from Pin(22) of the tuner?
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 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?
Is each signal supplied to each pin of IC451 as below?
Front input terminal
L-ch R-ch
Pin(8) Pin(54)
Pin(6) Pin(52)
Pin(4) Pin(50)
Scart jack 1 (JK101)
Pin(10) Pin(56)
Scart jack 2 (JK1402)
Tuner audio signal
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
No
No
No
No
No
No
No
No
No
No
No
No
No
Check the line between Pins(4,
50) of IC451 and Pin(22) of
tuner, and service it if defective.
Check the line between Pin(37,38) of IC451 and
Pin(71,72) of IC501, and service it if defective.
Check the line between Pin(53) of IC451 and
Pin(28) of IC501, and service it if defective.
Check the line between Pin(74,76) of IC451 and
Pin(2,12) of IC751, and service it if defective.
Is approximately 5V voltage supplied to Pin(16)
of IC751, or approximately -5V voltage supplied to
Pin(7) of IC751?
Replace IC751.
Check the AL+5V line and the AL-30V line
(R764, R765), and service it if defective.
Check the line between Pin(14,15) of IC751 and
Pin(1,3) of JK101 (Scart jack), and service it if
defective.
Replace IC451.
Replace IC501.
Replace the
tuner.
Is the "L" pulse inputted into the Pin(53) of IC451?
Is the "L " pulse inputted into the Pins(9,10,11) of
IC751?