TM 11-6625-3145-14
Maintenance: Troubleshooting-318/338 Service
ROM7 enables the read operation of the Jump Table ROM. It is generated by U005 (DUAL 2-LINE TO 4-line
decoder/demultiplexer, 74LS139). U001 (74LS139) on the A05 board decodes the BM1, BMREQ, and AB11 through
AB15 signals.
The MPU reads the output data from the Jump Table ROM U026 through U045 (octal bus transceiver with 3-state output,
74LS245) via the A08 board.
The MPU calculates the checksum with all the data contained in the Jump Table ROM, and compares it with the expected
value, also stored in this ROM. If the values do not match, the MPU issues an error message.
Figure 7-4. 318 MPU memory address assignment.
4.
DISPLAY RAM TEST
Program:
Function:
Power on -The Display RAM is checked with a checkerboard marching pattern from E800 to EFFF. (A checkerboard
marching pattern is an alternating 0 and 1 pattern that is loaded into a memory location, checked, shifted, and then
checked again.)
Step 1. The word 55 is written into all RAM addresses.
7-7
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 ...