(4) Data Transmission

/tF

FRAME

240



2

240



LOAD

/tF

2

240



2

5

FRAME

 

LOAD

 

CP

CP x(40/4) pulses

 

D0-D3

 

 

Fig. 5-404

5.4.2LED display circuit

(1) Method of LED display ex) Displaying “COPY” .

5VL

LDON0

 

Current

"L" 17

 

 

 

 

D7

"L"

Q3

G

 

 

R3

 

 

(COPY)

 

 

LED

IC

 

 

 

 

Fig. 5-405

 

Transistor is turned ON when the LDON 0 signal becomes “L” level.

Also, when IC pin changes to “L”, the current flows from 5VL via the transistor to the LED (“COPY”) to turn ON the LED (“COPY”).

Conditions to turn ON the LED

(a)The transistor (Q3) connected to the LED anode is ON.

(b)The output from the cathode side of the LED is “L” level. The LED turns ON when the conditions (a) and (b) are met.

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e-STUDIO350/352/353/450/452/453

 

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Toshiba 353, 452, 453, 350 service manual Data Transmission, LED display circuit, Method of LED display ex Displaying Copy
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350, 353, 453, 452 specifications

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