This procedure verifies the operation of the deskewing, acquisition, and word recognition capabili-ties of the 91 A04A and 91 AE04A modules. Any valid combination of the modules may be checked with this functional check procedure. All 91 A04A and 91 AE04A modules operate as a system, so they must be checked as a system.
You will need the following equipment to perform this procedure:
• DAS 9100 Mainframe
• 91 P16 Pattern Generator Module
• P6455 TTUMOS Pattern Generator Probe
• Enough P6453 Data Acquisition Probes with leads and TTL-type gripper tips for all 91 A04A and 91 AE04A modules in the system
• Pattern generator lead set
• two rows of 1 O-each square pins (p/n 131-1939-00) If available, add the following:
• 91 A32 or 91 A24 (slow card) Data Acquisition Module with probes (used to check ARMS 91 A04 mode)
Refer to the Module Installation instructions in the Operating Instructions section of this addendum for module installation requirements. Refer to Connecting a P6453 Probe to a P6455 Probe at the beginning of this section of the addendum for information on connecting P6453 probes to a 91 P16 pattern generator with the pattern generator lead set.
(1) Mainframe Setup for the Functional Check
The following steps configure the DAS mainframe for the functional check.
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Do not install or remove any electrical module or SUb-assembly in a DAS mainframe while the power is on. Doing so may damage the module or sub-assembly.
5-7
NOTE
The following steps may require removing modules that were previously installed in the mainframe.
1 . Turn off the mainframe power.
2. Check the jumpers on the 91 A04A and 91AE04A modules for correct placement in accordance with the Module Adjustment Procedures subsection of the Operating Instructions section of this addendum.
3. If the 91 A04A/91 AE04A system to be tested is already properly installed in the mainframe, leave it there. If the system to be tested is not yet in the mainframe, install it now. Be sure to fol-low the Module Instal/ation procedures given in the Operating Instructions and Maintenance:
General Information sections of this addendum. Refer also to the Maintenance: General Information section of your DAS 9100 Series Service Manual.
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Failure to follow the instal/ation guidelines will invalidate test results and may result in damage to
+
5 V Power Supply modules.4. Connect all cables between the 91A04A and 91AE04A modules.
5. Install the 91 P16 Pattern Generator Module in a powered bus slot of the DAS mainframe.
6. If a slow-card (91 A32 or 91 A24) is available, it should be installed in a powered bus slot of the DAS mainframe (used to check the ARMS 91 A04 mode).
7. Double check that the module installation requirements (see step 1) have been met, then turn on the mainframe.
8. Follow the instructions for setting clock offset on 91 AE04A modules. This information is found in the Module Adjustments subsection of the Operating Instructions section of this addendum.
9. Follow the instructions for setting DAC (digital-to-analog comparator) threshold and input comparator offsets on 91 A04A and 91 AE04A modules. This information is located in the Adjustments subsection of these Verification and Adjustment procedures.
(2) Executing the DiagnostiC Self Test
The following steps run all available self-test diagnostics on the 91 A04A and 91 AE04A modules.
NOTE
If
a
P6453 probe is connected toa
91A04A module during diagnostics,a
signal of
+
6.3 V ± 100 m V at the probe tip will cause a failure of diagnostics.1. Turn off the mainframe, then turn on the mainframe while holding down the STOP key on the keyboard. This will cause the power-up self test to fail.
2. Press START SYSTEM to enter the Diagnostics menu. Press SELECT to select the slot containing the 91A04A module.
Verif. and Adjust. Procedures--DAS9100 Series 91A04A/91AE04A Service
3. Select All mode, then press START SYSTEM. The DAS diagnostics will perform all available tests on the slot. The diagnostic tests; REG, MEM ADDR, DEL CNTR, DIF CNTR, ACO MEM, ClK ARRAY, HIGH RES, and WRD REC, should all pass. (The DESKEW EX and DAC THRSH tests have no internal read back, so they can neither pass nor fail.)
4. When the diagnostic tests of the 91 A04A module are complete, the cursor will return to the DAS screen. Press SELECT to select the slot for the desired 91 AE04A module. The diagnostic tests REG, MEM AD DR, ACO MEM, HIGH RES, and WRD REC, should all pass. (Clock and word-recognizer connections must be in place between 91A04A and 91AE04A to pass MEM ADDR and WRD REC tests.)
5. Repeat step 4 for other 91 AE04A modules in the system. The results should be the same as in step 4.
(3) Verifying Deskew Operation
This procedure verifies the operation of the 91 A04A and 91 AE04A deskewing circuits.
NOTE
Once the modules have been deskewed, do not turn off the mainframe until the functional check is complete. If the mainframe is turned off before the procedure is dinished, the deskew operation must be performed again.
1. Exit the Diagnostics menu by pressing the TRIGGER SPEC key.
2. Set the MODE field in the Trigger Specification menu to 91A04 ONLY.
3. Connect P6453 probes to the Pod C connector on the back of the 91 A04A and 91 AE04A modules. When the probe is connected to a module, the mainframe should beep and display the message POD XC CONNECTED (where X is the slot number of the module). (If the probe is al-ready connected, disconnect it; then re-connect it to obtain the beep and the message.) 4. Press the POD ID button on each probe housing. The mainframe should beep again and the
screen should show POD XC (where X is the slot number of the module).
5. Select the 91 A04 ONLY mode and move the screen cursor into the DESKEW POD field. Follow the instructions given on the screen. If your 91 A04 firmware is version 2.0 or above, you can view deskew steps by pressing the SHIFT and TRIGGER SPEC keys simultaneously, instead of the TRIGGER SPEC key by itself. The display should show a deskew step between 2 through 8.
6. After all modules have been deskewed, the DAS screen should read DESKEW COMPLETE. If any channels do not deskew, make sure their hybrids are properly oriented in the probe housing. Also make sure that the probe hybrid is well seated on the deskewing pins.
If any probe channels do not deskew, either the probe or the module the probe is attached to is not functional. Perform the functional check on the probe in a different (known good) module before as-suming the module is not operational.
(4) Probe Setup for the Functional Check of a Module
This procedure provides the initial test setup for the remaining functional checks. Perform the procedure provided under Connecting a P6453 Probe to a P6455 Probe which appears at the beginning of this Verification and Adjustments section.
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(5) Verifying Pod Connector C
The following steps verify the operation of all data lines of all the modules. The operation of the ex-ternal clock is verified at the same time.
1. Set the 91 A04 CLOCK field in the Trigger Specification menu to external rising edge.
2. Press the PATTERN GENERATOR key to enter the Pattern Generator menu. Set the pattern generator clock to 50 ns.
3. Adjust the pattern generator program to look like this:
SEQ LABEL HEX INSTRUCTIONS STROBES
0 0000 GOTO 200
200 200 0000
201 1111
202 2222
203 4444
204
8888
205 FFFF GOTO 200
4. Press START SYSTEM.
5. Examine the Timing Diagram menu. If necessary. adjust the timing display so the data acquired by the 91 A04A and 91 AE04A is displayed on the screen.
6. Set the magnification of the Timing Diagram to 10; this should produce a display like Figure 5-2.
Examine the data acquired by all 91 A04A and 91 AE04A modules. Proper data verifies that the modules acquire and display data and that the 91 A04A external clock operates. The trigger word is not critical. This step also checks the TTL threshold and the clock interface between modules.