
Service
Troubleshooting
Table 9-3 SWITCH PORT 1/2 Connector Pinout
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| 1 | Bit 6 HI | 14 | Bit 2 HI | |
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| 2 | Bit 6 LO | 15 | Bit 2 LO | |
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| 3 | Bit 7 HI | 16 | Bit 3 HI | |
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| 4 | Bit 7 LO | 17 | Bit 3 LO | |
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| 5 | + 12 Vdc | 18 | Bit 4 HI | |
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| 6 | + 12 Vdc | 19 | Bit 4 LO | |
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| 7 | GND | 20 | Bit 5 HI | |
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| 8 | GND | 21 | Bit 5 LO | |
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| 9 | GND | 22 | + 12 Vdc | |
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| 0 | Bit 0 HI | 23 | − 12 Vdc | |
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| 11 | Bit 0 LO | 24 | GND | |
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| 12 | Bit 1 HI | 25 | GND | |
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| 13 | Bit 1 LO |
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Troubleshooting the |
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| Run the test “Verifying the Switch Control Unit” on page | ||||
Switch Control Unit |
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NOTE |
| Check to make sure that the serial number prefixes of the Switch Control | |||
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| Unit and RF switch match. They are produced at the factory this way. It is | |||
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| acceptable to use switches and SCUs with different serial numbers. But if | |||
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| there is a problem, it may be because a newer switch is used with an older | |||
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| SCU, or an older switch is used with a newer SCU. |
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Troubleshooting the RF Switch
Troubleshooting the Cables
Run the test “Verifying the RF Switches” on page 2-13.
The cables will be checked during “Verifying the Switch Control Unit” and “Verifying the RF Switches” tests in Chapter 2, “Performance Verification.”
If a cable is suspected, use a voltmeter to check continuity between the connectors on each end of the cable. See Table
85330A Multiple Channel Controller |