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Crown SMX-6 Troubleshooting Manual

Iq system troubleshooting
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Download this manual See also: Service Manual, Reference Manual
Rev 3-97
IQ System Troubleshooting
OVERVIEW
The purpose of this chapter is to provide detailed information about system
level troubleshooting of IQ Systems. Most problems with IQ occur at the time
of installation. Good installation techniques take care of most problems before
they happen. This chapter provides some installation tips, but it assumes little
about the quality of installation techniques. It is also important to remember that
how well a system sounds or operates depends heavily on good system design
and installation. The best troubleshooting skills may do very little for a poorly
designed audio system. This chapter deals with troubleshooting IQ compo-
nents from a control standpoint, not audio performance.
OBJECTIVES
At the completion of the lecture and labs for this chapter the student should be
able to meet the following list of objectives:
• List the steps of universal troubleshooting techniques.
• Describe each step of universal troubleshooting techniques.
• State the most common installation problems encountered with IQ.
• List the configuration parameters that must match between software and
interface hardware.
• State the maximum operating length RS232 and RS422.
• State the maximum loop capacitance for normal Crown Bus operation.
• State the valid range of loop addresses.
• Explain what a valid component identification is.
• List the software functions that can be used to troubleshoot IQ.
• Explain how Roll Call is a troubleshooting tool.
• Describe the proper method of taking a voltage measurement to check
Crown Bus wiring.
• State the expected voltages for normal, open, shorted, and reverse polarity
Crown Bus wiring.
• Describe the proper method of taking current measurements to check
Crown Bus signal waveforms.
• State the minimum current for a current high and the maximum current for
a current low.
• Explain how software break detection works.
• List the most likely reasons why you might see an Interface Not Found
message.
• List the most likely reasons why you might not find components on a loop.
• Explain what happens to loop communication when an IQ component loses
power.
• State what resources are available to help you troubleshoot an IQ problem.
SLIDES
1. Universal Techniques
• Symptom Recognition
• Symptom Elaboration
• Probable Faulty Block
• Probable Faulty Function
• Repair
• Retest
* School
Notes
Troubleshooting — 1

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Summary of Contents for Crown SMX-6

  • Page 1 • List the configuration parameters that must match between software and interface hardware. • State the maximum operating length RS232 and RS422. • State the maximum loop capacitance for normal Crown Bus operation. • State the valid range of loop addresses. • Explain what a valid component identification is.
  • Page 2 • Software support • OIF/DLL files • Interface compatability • Power • Loop wiring • Capacitance • Duplicate or invalid addresses 13. Factory Support Issues • Hardware serviced only at Crown • Upgrades • Licensing of software • Development products Rev 3-97...
  • Page 3 Example: Examine system prints and find that component in equipment room #1 are all on Crown Bus loop 3 and they are the only components on loop 3. Problem is likely to be a communication problem somewhere in loop 3.
  • Page 4 One of the most common mistakes made when wiring Crown Bus connections is to reverse the polarity of a Crown Bus cable. A broken or unplugged cable or polarity reversal anywhere in the loop consitutes a break in the loop. When...
  • Page 5 60 pF per component on the loop. Restart the calculation at the output of each Repeater in the loop. RFI is rarely a problem with twisted pair Crown Bus cable because the Crown Bus is usually a 20 ma current loop. Induced noise may, however, be a consideration.
  • Page 6 Crown Bus loop. All IQ components sense Crown Bus data input continuity. A logic low is actually a high current condition and a logic high is a low current condition.
  • Page 7 Because the information reported includes the loop address and type of component you can tell that the break in the Crown Bus is in the line coming into the specified component.
  • Page 8 When you find this point you have located the break. Expected Crown Bus Voltages Another way of checking for a Crown Bus wiring problem is to use a DC voltage meter and check the voltage across the positive and negative lines of the Crown Loop is OK.
  • Page 9 When a loop problem exists and you have determined that the DC character- istics of the Crown Bus are all good and that there are no breaks, it is time to get serious and look at the data signal wave form. This check will tell you if there is a capacitance or RFI problem on a loop.
  • Page 10 Figure 5. Loop Current Test Ideal Crown Bus Waveform Shape 12 ma High Current 4 ma Current Figure 6. Ideal Loop Signal High Capacitance Crown Bus Waveform Shape 12 ma High Current 4 ma Current Figure 7. Loop Signal With High Capacitance SMX 3 SMX 4 + –...
  • Page 11 Crown Technical Support Group: 1-800-342-6939/1-219-294-8200 A team of people at the Crown factory exists for the purpose of providing technical assistance with Crown products. If you need help the Technical Support Group is available. Normal business hours (8 am to 5 pm EST) are kept, but if you are working on a major project and feel that after hours assistance may be needed you may contact us to make special arrangements.
  • Page 12 DOS. If in doubt, use a PC that meets the minimum requirements with the specified operating system. Question 1C: Are any files corrupted? Yes: Re-install the program. No: If the problem cannot be resolved contact Crown. Do you find Do you find the interface?
  • Page 13 Set parity to off, data bits to 8, stop bits to 1. Question 3G: If an SMX-6 is used as interface, is it in CLN mode? Yes: Use another component such as an INT II or PSI as the system interface or, if no other interface is available, reset the SMX by powering it down and temporarily disconnecting the battery.
  • Page 14 Question 4C: Does the software have valid OIF and DLL files for the component that is missing? Yes: Proceed to question 4D. No: Load the proper files from disk or contact Crown to obtain the proper files. Question 4D: Is power turned on at the missing component? Yes: Proceed to question 4E.
  • Page 15 This may not be correctable without using a different computer. Try a different mouse driver or try loading the mouse into a different memory area. Crown recommends Logitech as the mouse of choice. No: Proceed to question 5E. Question 5E: Do you receive Break Detect warnings?

  • Page 16: Factory Service

    Crown has over 100 authorized warranty stations across the U.S.; however, IQ System components (and microphones) should only be serviced at the Crown Factory. Also, all Crown hardware carries a 3-Year Full No-Fault Warranty which is fully transferrable. To...

  • Page 17: Review Questions

    1. What is likely to be the problem if you start the software but cannot run a Roll Call manually or automatically? 2. What is the most significant factor that determines maximum Crown Bus length on twisted pair wire? 3. True or False: The Crown Bus is polarity sensitive.
  • Page 18 8. List as many conditions as you can think of that would constitute a break in a Crown Bus loop. 9. If you measure 0.7 VDC across the positive and negative terminals of a Crown Bus connection, what does this indicate? 10.

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