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7. Waveform with Oscilloscope

(1) Crystal (12 MHz) (2) RESET (Power on reset)

Crystal Pin 34 of IC1 Upper : RESET input Pin 1 of IC8

Time/Div : 0.2 µs Lower : RESET output Pin 3 of IC8

Volt/Div : 1V Time/Div : 10 ms

Volt/Div : 2V

(3) Protection Circuit (4) Head Energizing Control Signal

Upper : RESET Pin 3 of IC8 Upper : HDEN Pin 57 of IC6

Lower : Drive Collector of TR13 Lower : HD1 Data Pin 47 of IC6

Time/Div : 5 ms Time/Div : 50µs

Volt/Div : Upper 2V Volt/Div : Upper 2V

Lower 2V Lower 2V

(5) Print Head Control Signal and Waveform (6) Carriage Motor Control Signal and Driving Signal

Upper : HD1 Data Pin 47 of IC6 Upper : Carriage-ø1 Control Signal Pin 38 of IC6

Lower : HD1 Pin 5 of JP2 Lower : Carriage-ø1 Driving Signal Pin 3 of CN5

Time/Div : 0.1 ms Time/Div : 1 ms

Volt/Div : Upper 5V Volt/Div : Upper 5V

Lower 10V Lower 20V

(2V)

(0V)

(4V)

(0V)

(4V)

(0V)

(4V)

(0V)

(4V)

(0V)

(4V)

(0V)

(4V)

(5V)

(0V)

(40V)

(20V)

(5V)

(0V)

(40V)

(0V)

(80V)

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Epson LC-7211 Especificações Página 105