TM 11-6625-3145-14
Theory of Operation-318/338 Service
POWER SUPPLY (A11AND A12)
The power supply provides dc voltages of -3.3 V, -12 V, + 12 V, -5 V, -2 V, and +5 V to operate the 318/338 circuitry. It
also supplies voltage for the fan motor. It operates in the line input range of either 90 to 132 V ac or 180 to 250 V ac at 48
Hz to 440 Hz single-phase.
LEFT-SIDE PANEL
A BNC connector for video-output is mounted on the left side panel. The BNC is connected to the MPU/Display board
through the Mother board. If option 01 is installed (318S1/338S1), a second BNC connector for the P6107 serial data
probe and a 25-pin male connector for the RS-232C port are added.
318S1/338S1 (A07)
The 318S1/338S1 Logic Analyzer has the I/O circuit board (A07) plugged into J7 of the Mother board. The 318S1/338S1
contains three added functions:
• Serial State Analysis
• RS-232C Interface (Remote)
• Non-Volatile Memory
Serial Input Comparator. Serial data from the P6107 serial data probe is supplied to the serial input comparator and is
converted to a TTL-level signal.
Serial I/O Controller. The Serial Input/Output (SIO) controller handles serial-to-parallel conversions. The SIO contains
two serial data transceivers, Port-A and Port-B. Port-A is used for serial data acquisition and Port-B is for RS-232C
control.
DETAILED CIRCUIT DESCRIPTIONS FOR THE 318
The following paragraphs contain theory of operation information for the 318 Logic Analyzer. For information on the theory
of operation for the 338 Logic Analyzer, refer to the Table of Contents and following sections of this chapter.
318 A01 INPUT A BOARD <1> <2>
A02 INPUT B BOARD <3> <4>
The Input section consists of the Input A (A01) and the Input B (A02) boards. The block diagram for these boards is
shown in Figure 4-1. Since both of these boards share the same function, they are discussed as a unit in this description.
OVERVIEW
Refer to schematics <1> and <3>. The acquisition stages consist of 16 discrete units that perform data sampling and
glitch recognition. Sixteen channels of data to be sampled come into the unit from the P6451 parallel data probe. Each of
the acquisition stages feeds data to the acquisition RAM where it can be read by the MPU. The same data from the
parallel data probe is supplied to the glitch recognition lines, and the 16 glitch recognition outputs are combined and
applied to the glitch trigger circuits.
To help explain the operation of the data channels, we will trace the operation of channel 8. Refer to the schematic <3>.
4-5
Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
Page 526: ...TM 11 6625 3145 14 ...
Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
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Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
Page 554: ......
Page 555: ...PIN 058584 ...