TM 11-6625-3145-14
Maintenance: Troubleshooting-318/338 Service
3.
All character fonts for the parallel analyzer mode. To check the CRT circuit and the Character ROM (CROM) for
parallel operation.
4.
All character fonts for the serial state analyzer mode. To check the CRT circuit and the CROM for serial operation.
Description: Refer to Figure 7-34. The CRT displays 32 characters by 20 lines of data from the Display RAM U515 (16 K-
bit static CMOS RAM, uPD446/HM6116P) on the A06 MPU/Display board. Each character in the CRT display uses two
bytes of data, consisting of one selection code followed by one character code. A total of 1280 bytes of the Display RAM
are used, ranging from address E800 to ECFF.
The MPU writes these two bytes of data for each character to be displayed into the Display RAM through both U525 (octal
bus transceiver, 40H245) and U500 (display controller, MB62110) on the A06 board.
The Display Controller sends the first address to the Display RAM to select the character code to be displayed, and
instructs U520 (octal D type flip-flop, 40H273) on the A06 board to store the out-put data from the Display RAM. This data
is supplied to the Character ROM U530 (32 K-bits mask ROM, 2332) on the A06 board to select the character font. The
Display Controller receives this font code and sends the second address to the Display RAM to get a control code.
The Display Controller then issues Z, GLITCH, CHD, and VD signals to the A10 CRT board, along with these two bytes of
data. These signals are buffered and/or controlled and sent to the A10 board through the A08 Mother board.
4434-556
Figure 7-34. 338 CRT calibration and check schematic.
7-97
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 ...