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TM 11-6625-3145-14
Theory of Operation-318/338 Service
Table 4-6. (cont.)
MEMORY MAP
Page
Address Range
Capacity and Use
ALL
C000-DFFF
ROM 7, 8K X 8; Jump
Table
ALL
E000-E7FF
NVM RAM, 2K X 8
ALL
E800-EFFF
Display RAM, 2K X 8
ALL
F000-F7FF
RAM 1, 2K X 8
ALL
F800-FFFF
RAM 2, 2K X 8
Table 4-7.
I/O MAP
Address Range
I/O Use
Board #
00-1F
INPUT A&B board
A01 & A02
20-3F
INPUT A&B board
A01 & A02
40-5F
ACQ A&B board
A03 & A04
60-7F
ACQ
A&B board A03 & A04
80-9F
Option board
A07
A0-BF
No use
C0-DF
No use
E0-FF
Mainframe
A05, A06, A09, A10
THRESHOLD CIRCUIT
The threshold circuit consists of a dual digital-to-analog (D/A) converter, analog switches, and an I/O decoder.
D/A Converter. The D/A converter consists of A05U70, A05U75, A05U80, A05U85, and A05U130B. A05U70 and
A05U80 are D/A converter ICs. A05U75 and A05U85 are dual-OP amplifiers, which convert double eneded to single
ended output. A05U130B supplies a reference standard voltage source (3.2 V).
Analog Switches. The analog switch consists of A05U100, A05U105, A05U110, A05U111, A05U112, A05U113,
A05U114, A05U120, A05U125, and A05U130A. A05U100 and A05U105 are 1/0 data latch circuits that perform three
different functions. They hold data that selects the type of threshold (TTL, V1, V2, or V3). They hold data that selects the
page of the ROM; and they hold data that selects the CROM or the KBMASK. A05U110 to A05U114 are analog-switch
ICs that select the threshold voltage determined by the latched data from A05U100 and A05U105. A05U120, A05U125,
and A05U130A convert high-output impedance to low.
4-25
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 ...