TM 11-6625-3145-14
Maintenance: Troubleshooting-318/338 Service
Function 2 includes two test programs. These programs control the external trigger transition, and check the trigger status
in bit #1 of the option status register.
Function 3 includes eight test programs. These programs generate serial data (shift pattern data: 01 02 04 08 10 20 40) at
pin #2 of the RS-232 connector. The programs also check incoming data at SIO Port-A. Serial data speed is changed
automatically during the test.
(The Test data format is fixed to 8 bits/word, even parity, 1 stop bit. The data threshold is TTL, and data polarity is
negative.)
Description- Refer to the 01 Option I/O function list and simplified diagram of the Serial and the RS-232 when reading the
following:
SIO Port-A is used for Serial data acquisition. The Port-A address is 90 and 91, and the Serial parameter selector address
is 8C.
U31 latches the baud select data, input data polarity bit, and the external trigger polarity bit. These are the parameters for
Serial acquisition control.
U6 generates the receive data sampling clock and supplies this clock to SIO pin #13. U22 switches the input clock
selector from either the 19.2 K internal clock or the External clock; but the TSTSR2 program does not test this logic.
The external trigger polarity is defined by U12, and U22 latches on the transition of U12’s output. This status is initialized
by writing data to address 84. External trigger status appears at bit #0 of the option status register; its address is 80.
The serial input data level is devided by 10 at input and this signal is amplified 2.5 times by U100 before reaching Test
Point 10. The data at T.P. 10 is compared with Threshold C (supplied from the RAM board through bus connector 39B)
by U110; then data polarity is defined by U12 and supplied to SIO pin #12.
The 1/0 loop feature is available for TSTSR2. This mode is used to check the I/O address selection circuit. When the
diagnostic program is running in the I/O loop mode, TSTSR2 executes following program functions continuously.
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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 ...
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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 ...
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Page 555: ...PIN 058584 ...