– 74 –
5.
Waveform with Oscilloscope
(1) Crystal (12 MHz)
(2) RESET (Power on reset)
Crystal
Pin 28 of IC7
Upper
: RESET input
Pin 1 of IC5
Time/Div : 0.2
µ
s
Lower
: RESET output Pin 3 of IC5
Volt/Div
: 1V
Time/Div : 10 ms
Volt/Div
: 2V
(3) Protection Circuit
(4) Head Energizing Control Signal
Upper
: RESET
Pin 3 of IC5
Upper
: HDEN
Pin 111 of IC4
Lower
: Drive
Collector of TR9
Lower
: HD1 Data
Pin 67 of IC4
Time/Div : 5 ms
Time/Div : 50
µ
s
Volt/Div
: Upper 2V
Volt/Div
: Upper 1V
Lower 2V
Lower 2V
(5) Print Head Control Signal and Waveform
(6) Carriage Motor Control Signal and Driving Signal
Upper
: HD1 Data
Pin 67 of IC4
Upper
: Carriage-ø1 Control Signal Pin 31 of IC4
Lower
: HD1
Pin 2 of TA1
Lower
: Carriage-ø1 Driving Signal Pin 3 of CN8
Time/Div : 0.1 ms
Time/Div : 2 ms
Volt/Div
: Upper 5V
Volt/Div
: Upper 5V
Lower 10V
Lower 20V
(2V)
(0V)
(4V)
(0V)
(4V)
(0V)
(4V)
(0V)
(4V)
(0V)
(0V)
(4V)
(0V)
(4V)
(5V)
(0V)
(40V)
(0V)
(5V)
(0V)
(0V)
(100V)
Содержание LC-8521
Страница 1: ...DOT MATRIX PRINTER LC 8521 TECHNICAL MANUAL THIRD EDITION ...
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Страница 101: ... 97 Blank Page ...
Страница 102: ... 98 4 Wiring Scheme of Printer ...
Страница 103: ... 99 ...
Страница 104: ... 100 5 Electrical Parts 5 1 Main Logic Board 5 1 1 Circuit Diagram ...
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Страница 107: ... 103 Blank Page ...
Страница 108: ... 104 5 1 2 Component Layout ...
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Страница 116: ... 112 5 4 Power Supply Unit 5 4 1 Circuit Diagram ...
Страница 117: ... 113 5 4 2 Component Layout ...
Страница 120: ... 116 6 Serial Parallel Converter Board Option 6 1 Wiring Scheme ...
Страница 122: ... 118 6 3 CPU Board 6 3 1 Circuit diagram ...