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1-10-11

H9741TS

Video E-E does not appear.

Is the Video signal inputted to Pins(48,50,52,54) of 
IC301?

1) In the external input mode

2) In the U/V tuner mode

Check the line between Pin(20) of JK101 (Scart
jack) and Pin(50) of IC301, and service it if 
defective.
Check the line between Pin(20) of JK1402 
(Scart jack) and Pin(52) of IC301, and service it 
if defective.
Check the line between the video input 
terminal (front) and Pin(54) of IC301, and 
service it if defective.

Check the line between Pin(24) of the U/V tuner 
and Pin(48) of IC301, and service it if defective.

Yes

Yes

Yes

No

Yes

Yes

Yes

No

Yes

No

No

No

No

No

Is the C-SYNC signal outputted to Pin(67) of IC301?

Is the C-SYNC signal inputted to Pin(58) of IC501?

Is the video signal outputted to Pin(4) of IC751?

Is the "L" pulse inputted into Pin(9,10,11) of IC751?

Yes

Replace IC751.

Replace IC501.

Is approximately 5V voltage supplied to Pin(16) 
of IC751, or approximately -5V voltage supplied to 
Pin(7) of IC751?

No

Check the AL+5V line and the AL-30V line 
(R764, R765), and service it if defective.

Check the line between Pin(67) 
of IC301 and Pin(58) of IC501, 
and service it if defective.

Check the line between Pin(4) of IC751 
and Q104, and service it if defective.

Check the line between Pin(61) of IC301 and 
Pin(5) of IC751, and service it if defective.

When only Line signal is not outputted...
check the line between the emitter of Q104 and 
Pin(19) of JK101 (Scart jack), and service it if 
defective.
When only RF signal is not outputted...
check the tuner (TU701), and the line between 
the emitter of Q104 and Pin(6) of the tuner, 
and service it if defective.

Is the video signal inputted into Pin(5) of IC751?

Is the video signal outputted to the emitter of Q104?

Replace IC301.

1-10-12

H9741TS

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

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

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?

1-10-13

H9741TS

Hi-Fi audio can not be playbacked normally. (Hi-Fi E-E mode is normal.) 

Hi-Fi audio can not be recorded normally in the linear audio mode. (E-E mode is normal.) 

Is the audio signal inputted into Pin(13,15,17) of IC301?

Does the Bias oscillation circuit operate normally?

Is the audio signal outputted to Pin(11) of IC301?

Is the Playback Envelope signal outputted to 
Pin(33) of IC451?

Replace IC301.

Is CN504 and the connected cable normal?

Is the Hi-Fi-H-SW signal inputted into Pin(39) of IC451?

Yes

Yes

Yes

Is the audio signal outputted to Pin(100) of IC301?

Yes

Yes

Replace ACE head.

Yes

Yes

No

No

No

No

Check the Hi-Fi-H-SW line between 
Pin(39) of IC451 and Pin(19) of 
IC501, and service it if defective.

Check the line between Pin(78) of IC451 and 
Pin(13,15,17) of IC301, and service it if defective.

Check the Bias oscillation circuit (Q401,Q403,
Q404,Q405,Q406) and service it if defective.

Replace 
IC451.

Replace IC451.

No

Replace IC301.

No

Replace CN504 and the connected cable.

No

Hi-Fi audio can not be recorded normally. (E-E mode is normal.) 

Is the REC FM signal outputted to Pin(26) of IC451?

Is the line between Pin(8) of CN251 and 
Pin(26) of IC451 normal?

Replace the Cylinder Assembly.

Yes

Yes

No

Replace IC451.

No

Check the line between Pin(8) of CN251 and 
Pin(26) of IC451, and service it if defective.

1-10-14

H9741TS

Hi-Fi audio can not be playbacked normally in the linear audio mode. (E-E mode is normal.) 

Are the CN504, the connected cable and the parts 
on periphery of playback amplifier normal?

Is there no dirt on the surface of ACE head?

Is the audio signal supplied to Pin(9) of IC301?

Replace 
IC301.

Is the audio signal outputted to Pin(11) of IC301?

Check the line between Pin(11) of 
IC301 and Pin(80) of IC451, and 
service it if defective.

Service and replace poor parts.

Readjust the height of the ACE head.

Clean the surface of ACE head.

Yes

Yes

Is the height of ACE head appropriate?

Yes

Replace the ACE head.

Yes

No

Yes

No

No

No

No