Theory of Operation
TDS 340A, TDS 360 & TDS 380 Technical Reference
3–13
A2/A3 Option 14 Board
The A2 Option Board has GPIB, RS-232, and Centronics interfaces for external
control and hard copy operations. The A3 board has VGA Video output and
printer power interfaces.
Refer to schematic A2
. Signals travel from the processor board through the
J1 connector to the U2 address decoder. U2 uses lines A15, A16, and A18 to
break incoming addresses to either the RS-232, Centronics, GPIB or option
ROM.
The GPIB circuitry is composed of GPIB controller U8, with transceivers U9
and U10 buffering signals to and from the GPIB on the option board.
Refer to schematic A2
. The RS-232 portion of the board connects to the rear
panel through port J2. Signals travel from the processor board through the J1
connector to the U4 dual asynchronous receiver/transmitter (DUART). The
DUART sends data to the U5 driver/receiver. U5 converts signals from logic
levels on the DUART side to RS-232 levels at the 9-pin connector. From U5,
information goes out port P2.
The Centronics portion of the board connects to the rear panel through the 9-pin
connector J3. Data travels from the processor board through the J1 connector to
register U6 where it is sent out J3. U4 manages control signals. U12 buffers
printer status information to be read through U4.
Refer to schematic A3
. The 9-pin VGA video connector routes auxiliary
HSYNC, VSYNC, and VIDEO signals from main board connector J703 to the
rear panel.
The printer power converter uses switching regulator U1 to c15 V from
the power supply to +8 V output at rear panel connector J2. This provides power
for the Option 3P thermal printer.
A6 Front Panel
The CPU system sends instructions to and receives information from the
Front-Panel Processor on the Front-Panel Board. The Front-Panel Processor
reads the front-panel switches and ports, and reports any change in their settings
to the processor system. The Front-Panel Processor also turns the LEDs on
and off.
The Front-Panel Processor reads the front-panel menu switches and sends any
changes in menu selections to the CPU system. The Front Panel Processor does
not read the ON/STBY button; its signal passes through the Front-Panel Board
and the Main Board to the A20 Low Voltage Power Supply.
The front panel also generates the probe compensation signal.
Summary of Contents for TDS 340A
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Page 12: ...Contents viii TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 16: ...Service Safety Summary xii TDS 340A TDS 360 TDS 380 Technical Reference ...
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Page 42: ...Operating Information 2 10 TDS 340A TDS 360 TDS 380 Technical Reference ...
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Page 49: ...Theory of Operation 3 6 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 59: ...Theory of Operation 3 16 TDS 340A TDS 360 TDS 380 Technical Reference ...
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Page 82: ...Performance Tests 4 22 TDS 340A TDS 360 TDS 380 Technical Reference ...
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Page 91: ...Adjustment Procedures 5 8 TDS 340A TDS 360 TDS 380 Technical Reference ...
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Page 140: ...Troubleshooting 6 48 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 142: ...Repackaging Instructions 6 50 TDS 340A TDS 360 TDS 380 Technical Reference ...
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Page 206: ...Electrical Parts List 8 58 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 207: ......
Page 210: ...TDS 340A 360 380 OPTION BOARD BLOCK DIAGRAM A2 0 ...
Page 211: ......
Page 212: ...OPTION BUS AND GPIB A2 TDS 340A 360 380 1 ...
Page 213: ......
Page 214: ...TDS 340A 360 380 ROM PRINTER AND RS 232 A2 2 ...
Page 216: ...PRINTER POWER A3 1 TDS 340A 360 380 OPTION 14 ...
Page 218: ...A5 1 FLOPPY INTERFACE TDS 340A 360 380 ...
Page 222: ...CPU A6 TDS 340A 360 380 1 ...
Page 223: ......
Page 224: ...A6 TDS 340A 360 380 2 FPP POTS ...
Page 225: ......
Page 226: ...LEDS DRIVER A6 TDS 340A 360 380 3 ...
Page 227: ......
Page 228: ...SWITCHES A6 TDS 340A 360 380 4 ...
Page 233: ...9 26 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 234: ...ROOT SHEET A11 A12 TDS 340A 360 0 ...
Page 235: ......
Page 236: ...TRIGGERS A11 A12 TDS 340A 360 1 TDS 340A ...
Page 237: ......
Page 238: ...ATTENUATORS A11 A12 TDS 340A 360 2 TDS 340A TDS 340A ...
Page 239: ......
Page 240: ...TRIGGER LOGIC AND TIME INTERPOLATOR A11 A12 TDS 340A 360 3 ...
Page 241: ......
Page 242: ...TIME BASE CONTROLLER A11 A12 TDS 340A 360 4 ...
Page 243: ......
Page 244: ...SAMPLER A11 A12 TDS 340A 360 5 ...
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Page 246: ...CPU A11 A12 TDS 340A 360 6 TDS 340A ...
Page 247: ......
Page 248: ...DISPLAY A11 A12 TDS 340A 360 7 ...
Page 252: ...MAIN BLOCK DIAGRAM A13 TDS 380 0 MAIN BOARD 671 3753 00 389 2154 00 ...
Page 253: ......
Page 254: ...TRIGGERS A13 TDS 380 1 ...
Page 255: ......
Page 256: ...ATTENUATORS A13 TDS 380 2 ...
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Page 258: ...TRIGGER LOGIC AND TIME INTERPOLATOR A13 TDS 380 3 ...
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Page 260: ...TIMEBASE A13 TDS 380 4 ...
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Page 262: ...SAMPLER A13 TDS 380 5 ...
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Page 264: ...CPU A13 TDS 380 6 ...
Page 265: ......
Page 266: ...DISPLAY A13 TDS 380 7 ...
Page 269: ...9 62 TDS 340A TDS 360 TDS 380 Technical Reference ...
Page 270: ...MONITOR BLOCK DIAGRAM A26 TDS 340A 360 380 0 ...
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Page 272: ...INPUTS VIDEO AND VERTICAL DEFLECTION A26 TDS 340A 360 380 1 ...
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Page 286: ...Mechanical Parts List 10 12 TDS 340A TDS 360 TDS 380 Technical Reference ...
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