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- 8 -

Caution items at the time of inspection

•

Always pull the plug of the AC code before performing a continuity check.

•

When solder has been removed or a connector has been pulled, please restore the original condition after each inspection.

•

When the tester has been set to 

Ω

 a voltage with the opposite polarity of the voltage impressed when the tester is used as a

voltmeter is put out from the tester, and for inspection of a load short-circuit, connect the tester rod on the plus side (red) to
earth and the tester rod on the minus side (black) to the power supply line.

•

Generally, a value of 10 

Ω

 or less can be considered as a load short-circuit.

W

Load

BLACK

RED

The main power/video reception
LED does not light even when
the main power switch is set to ON.

Is the fuse F801 blown?

Perform short-circuit inspection
for the AC 120 V line
(T801, D841 to D844, C842, etc.).
Exchange the fuse F801.

Is a voltage of 10 V
supplied to pin 1 of the
connector E15?

Is a voltage of 5 V
supplied to pin 4
of IC3111?

Exchange U-Module

Unsolder pin 1

of the connector E15

and check if a voltage of

10 V is supplied to pin 1

of the connector

D15.

D841 to D844, C842
short-circuit inspection,
exchange

IC3111, C3124 short-circuit
inspection, exchange

IC3111 open inspection, C3071,
C3098 short-circuit inspection,
exchange

Yes

Yes

Yes

No

No

No

No

Yes

& !"#$

- 9 -

When the main power switch is
set to ON, the main power/video
reception LED lights in the order of
red -> green -> red
and flashes once.

Q509, Q510 short-circuit inspection,
simultaneous exchange
Q612, Q502 short-circuit and open inspection
D506, D404, Q401 short-circuit inspection
IC608, IC607, IC402 inspection
T551 inspection
Exchange

When the main power switch is
set to ON, the main power/video
reception LED lights in the order of
red -> green -> red
and flashes twice.

IC881 open inspection
Q890 short-circuit inspection
Exchange

When the main power switch is
set to ON, the main power/video
reception LED lights in the order of
red -> green -> red
and flashes five times.

Perform a 

continuity check 

between pins 1 and 2 of 

the connector E13 and earth 

and check for a 

short-circuit.

Perform a 

continuity check 

between pin 2 of IC3109 

and earth and check for 

a short-circuit.

IC3109 open inspection
IC3110 open inspection
Q3023 short-circuit inspection
D3039, D3050, D3022, D3035, D3011 
short-circuit inspection
Exchange

IC3109, C3117 short-circuit inspection
IC3110, C3069 short-circuit inspection
Exchange

IC3109, D3017 short-circuit inspection
IC3061, D3047, C3061 short-circuit inspection
J-Module and HM-Module short-circuit 
inspection Exchange

Short-circuit

Short-circuit

No short-circuit

No short-circuit

* Flashing is done six times in case of 
  a short-circuit on the rectification side.

' !"#$

- 10 -

When the main power switch is
set to ON, the main power/video
reception LED lights in the order of
red -> green -> red
and flashes three times.

Pull the

connector D1, perform

a continuity check between

pins 1 and 2 of the connector

E11 and earth, and

check for

a short-circuit.

Unsolder

pins 2 and 3 of the

connector E11,

perform a continuity check between

pins 2 and 3 of the connector

D11 and earth, and check

for a short-circuit.

Perform

a continuity check

between pin 3 of IC3107

and earth, and check

for a short-circuit.

Is a voltage of about 4 V
supplied to pin 66
of U-Module?

Q879 open inspection
Q881, C870 short-circuit inspection
RL879 inspection
IC3107 open inspection
Exchange

IC881, D881, C882
short-circuit inspection
Exchange

IC3107, C3051 short-circuit inspection 
DP-Module, and GY-Module short-circuit inspection
C3021, C3032 short-circuit inspection
Exchange

IC3107, C3048, C3088 short-circuit inspection
X, U, DP and GY-Module short-circuit inspection
C3095, C3058, C3037 short-circuit inspection
Exchange

Exchange the U-Module.

Short-circuit

Short-circuit

Short-
circuit

No short-circuit

No short-circuit

No short-circuit

Yes

No

( !"#$

- 11 -

When the main power switch is
set to ON, the main power/video
reception LED lights in the order of
red -> green -> red
and flashes four times.

Perform

a continuity check

between pins 7 and 8 of the connector

E12 and earth, and check

for a short-circuit.

Unsolder

pins7 and 8 of the

connector E12, perform

a continuity check between pins

7 and 8 of the connector D12

and earth, and check for

a short-circuit.

Perform

a continuity check

between collectorand emitter

of Q551, and check

for a short-circuit.

D861, C861 short-circuit inspection
IC881 open inspection
C958 short-circuit inspection
Exchange

Q500 short-circuit inspection
Exchange

Q551 short-circuit inspection
D509 short-circuit inspection
Exchange

Perform

a continuity check

between pins 3 and 4 of the connector

E14 and earth, and check for

a short-circuit.

Perform

a continuity check

between pin 8 of the connector

E13 and earth, and check for

a short-circuit.

Unsolder

pins 3 and 4 of the

connector E14, perform

a continuity check between pins

3 and 4 of the connector D14

and earth, and check for

a short-circuit.

IC2301, D3016, C3009
short-circuit inspection
Exchange

D867 short-circuit inspection
Exchange

D866 short-circuit inspection
Exchange

Unsolder

pin 8 of the connector

E13, perform a continuity check

between pin 8 of the connector D13

and earth, and check for

a short-circuit.

IC451, C654, C626 short-circuit inspection
Q623 short-circuit inspection
Simultaneous exchange

Short-circuit

Short-circuit

Short-circuit

Short-circuit

Short-circuit

Short-circuit

Short-
circuit

No short-circuit

No short-circuit

No short-circuit

No short-circuit

No short-circuit

No short-circuit

No short-circuit

Continued on the next page

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