TM 11-6625-3145-14
Theory of Operation-318/338 Service
The acquisition module consists of:
• Parallel data inputs (Input A and Input B boards)
(A01 & A02)
• Acquisition (ACQ) Control board
(A03)
• ACQ Memory board
(A04)
• Serial Analysis/RS-232/NVM Option 01 board
(A07)
NOTE
The 318 and 338 have different acquisition circuitry; make sure you reference the
correct description for the instrument you are servicing.
The mainframe consists of:
• ROM/Threshold board
(A05)
• MPU/Display board
(A06)
• Mother board
(A08)
• Keyboard
(A09)
• CRT board
(A10)
• Power supply
(A11 & A12)
The mainframe is common to both the 318 and 338 Logic Analyzers; circuit board assemblies are marked 318/338
AXX.
NOTE
The 318 has two unique circuit board assemblies marked 318 A01, and 318 A02; the
338 also has two unique circuit board assemblies, marked 338 A01, and 338A02.
Circuit boards that are common to both the 318 and 338 are marked 318/338. The
tabs in the Diagrams section of this manual are marked 318/338, 318, or 338 to
correspond to the circuit board assemblies used in the analyzer.
ACQUISITION MODULE
PARALLEL DATA INPUTS (A01 AND A02)
The Input-A (A01) and Input-B (A02) boards configure the parallel data inputs. These boards are mounted into connectors
J1 and J2, respectively, on the Mother board.
P6451 Parallel Data Probe. In the 318, two P6451 parallel data probes can be connected to the right-side panel. The
338 has four P6451 parallel data probes. Each probe accepts eight channels of data and one qualifier channel for either
trigger or clock qualifications. Thus, 16 channels of data and 2 channels of qualifiers are available for the 318, and 32
channels of data and 4 channels of qualifiers are available for the 338.
P6107 External Clock Probe. The P6107 external clock probe is identical to the serial data probe, but the input
capacitance compensation is slightly different (20 pf for the external clock probe, 40 pf for the serial data probe). See the
External Clock Probe Compensation
for instructions on adjusting the probe compensation.
This probe receives an external clock signal when the 318/338 is operating in synchronous mode.
4-2
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 ...
Page 532: ...TM 11 6625 3145 14 ...
Page 536: ...TM 11 6625 3145 14 ...
Page 538: ...TM 11 6625 3145 14 ...
Page 539: ...TM 11 6625 3145 14 ...
Page 540: ...TM 11 6625 3145 14 ...
Page 541: ...TM 11 6625 3145 14 ...
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 ...