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Check the IC5555 selector switch, 
terminal voltage and input circuit.

Is there video signal input at pins
 (76) and (88) of IC4502?

Check the low-pass and buffer 
circuits of Q4501,Q4502,and 
Q4508,Q4509.

Are there signal outputs at pins (83) 
and (84) of IC4502?

Check IC4502,IC4503 and their 
peripheral circuits (bias).

Check the buffer circuits of Q4503 
thru Q4504. Is the signal as 
specified?

Check IC4501,IC4311and their 
peripheral circuits.
(Go to "Checking the output 
PWB unit".)

Is there video signal output at P401 
pin (9).

Check Q4503 thru Q4504 and their 
peripheral circuits.

Go to "Lamp fails to light-up".

Is specified voltage fed to EA  
connectors?

Check the power circuit and its parts.

Are there signal inputs at pins (9), 
(19) and (21) of SC401?

Are there signals at pin (7) of IC5555?

Are there signal outputs at pins 
(1),(12) and (14) of SC4303?

Check the IC5555 and its 
peripheral circuits.

Check SC4303,P4303 and 
their peripheral circuits.
(Go to "Checking the output 
PWB unit".)

Check IC4311, IC4502, 
IC4501and their peripheral 
circuits.

Is the lamp on?

Check the IC3302 of input unit 
and its peripheral circuits.

Are there output waveforms at pins 
(16), (18), (20) of IC4301?

Check the IC4301 selector switch, 
terminal voltage and  peripheral 
circuits.

Are there RGB input waveforms at 
pins (1), (3) and (5) of IC4301?

Go to "Checking the signal unit 
circuit". (signal unit-3/3)

Check the IC4301 selector switch 
terminal voltage and peripheral circuits?

Check SC4301,P4301 and their 
peripheral circuits.
Go to "Checking the output PWB 
unit".

Are there signal inputs at pins (8), 
(10) and (12) of SC4301?

Are there output waveforms at pins 
(16) (18) (20) of IC4301 (RGB signal)?

Check SC4301,P4301 and their 
peripheral circuits.
Go to"Checking the output PWB unit".

Check IC4502 and its peripheral 
circuits.

Check IC4501 and its peripheral 
circuits.

Check IC4311 and its peripheral 
circuits.

Check SC4303 and its peripheral 
circuits.

Is there Y signal output at pin (5) of 
IC4311?

Is there Y signal output at pin (7) of 
IC4501?

Is there Y signal input at pin (84) of 
IC4502?

Are there signal inputs at 
SC8405, SC8502, SC8404? 
Are voltages applied to EA 
connectors?

Check IC1401,Q1401,Q1402, 
Q1403 and their peripheral 
circuits.

Are there signal outputs at
pins (18) (16) (14) of IC1401?

Are there signal inputs at 
pin(44) and (47) of IC1101, 
IC1102, IC1201, IC1202, 
IC1301 and IC1302?

Check IC1101,IC1201,IC1301   
and their peripheral circuits.

Are there signal outputs at pins 
(17), (19), (21), (28), (30) and 
(32) of IC1101, IC1102, 
IC1201, IC1202, IC1301 and 
IC1302?

If there is no signal input at 
pins (15) and (30) of  
SC1101, SC1102 and 
SC1103, check IC1001, 
IC1004 and their 
peripheral circuits.

If there is no signal input at 
pins (1) and (31) of  SC1101, 
SC1102 and SC1103, check 
the switching circuit and 
amplifier circuit of IC1101, 
IC1201, IC1301, IC1102, 
IC1202, IC1302 and their 
peripheral circuits.

Are there signal inputs at 
SC1101, SC1201 and 
SC1301?

Check IC1558, IC1559, 
IC1551~IC1556 and their 
peripheral circuits.

Check the R, G and B panels.

If there is no signal at EA 
connector or SC8404, SC8405 
and SC8502, go to Checking 
the power unitblock.

If there is no signal at P4302, 
P4303 and P4301, go to 
"Checking the video system". 

Check IC2102, IC2202, 
IC2302 and their peripheral 
circuits.