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Using the oscilloscope, 
measure the land of R8231 
(pin (32) of IC8026). Is 
there composite sync 
signal?

Using the oscilloscope, 
measure the land of R8110 
(base of Q8010). Does the 
video signal contain the 
sync signal?

Is there video signal with 
sync signal at pin (18) of 
IC3002 connection 
terminal PWB?

IC3002 connection 
terminal PWB or its 
peripheral circuit defective.

IC8008, IC8009, IC8031 or 
their peripheral circuit 
defective.

SC3003 or its peripheral 
circuit defective.

End

Feed the specified video 
signal.

Is there video signal at pin 
(73) of IC8003?

Go to "Checking the 
video sync signal".

Is there video signal at pin 
(7) of IC3403 connection 
terminal PWB? 

IC3403 or its peripheral 
circuit defective. Or 
SC3003 in poor contact.

Is the image disturbed?

Does an image appear?

Are the colors as 
specified?

End

IC8003 or its peripheral 
circuit defective.

J3303 or its peripheral 
circuit defective.

Select VIDEO with the 
set’s key or remote control 
button.

Using the oscilloscope, 
measure the signal at 
TL8006. (Check the 
vertical sync signal.)

Using the oscilloscope, 
measure the signal at 
TL8009. (Check the 
horizontal sync signal.)

Is there signal with half the 
vertical frequency at 
TP8010?

Is there 27MHz or so clock 
signal at FL8034?

Is there 13.5MHz or so 
clock signal at FL8034?

IC8003 or its peripheral 
circuit defective.

End

Is the vertical sync signal 
as specified?

If out of spec again, 
IC8003 or its peripheral 
circuit defective.

Is the horizontal sync 
signal as specified?

Is there 15kHz or so signal 
at TP8007?

Go to "Checking the input 
signal setting".

Is there 40MHz or so clock 
signal at FL8024?

Is there 38kHz or so pulse 
(sync) signal at FL8026?

Is there 60Hz or so pulse 
(sync) signal at FL8025?

End

IC8022, IC8021 or their 
peripheral circuit defective.

Go to "Checking the PLL 
circuit".

Are there audio output 
signals at pins (7) of 
IC3301 and IC3302?

Is voltage applied to pin (4) 
of IC1901?

Using the remote control, 
change VOL and cancel 
MUTE. Does the voltage at 
pin (7) of IC1901 vary 
accordingly?

Is there audio output signal 
at pin (5) of IC1901?

Check IC1403, IC1605 and 
their peripheral circuits.

Check IC1901 and its 
peripheral circuits.

Check the SP connector.

Check R1914 first and 
then the power circuit.

Check the audio cable. 
Switch IC3301 and IC3302 
to each other to check the 
peripheral circuits.

Using the communication 
software ("TERA TERM" 
recommended), make the 
following settings:
Baud rate: 9600 bps
Bit length: 8 bits
Stop bit: 1 bit
Parity: None
Press the RETURN key on 
the keyboard. Does "ERR" 
reappear?

End

Check IC3601, IC1606, 
IC1601, SW1602, IC8022, 
communication circuit and 
their peripheral circuits.