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85330A Multiple Channel Controller 9-11
Service
Troubleshooting
Troubleshooting the
Switch Control Unit
Run the test “Verifying the Switch Control Unit” on page 2-12.
NOTE Check to make sure that the serial number prefixes of the Switch Control
Unit and RF switch match. They are produced at the factory this way. It is
acceptable to use switches and SCUs with different serial numbers. But if
there is a problem, it may be because a newer switch is used with an older
SCU, or an older switch is used with a newer SCU.
Troubleshooting the
RF Switch
Run the test “Verifying the RF Switches” on page 2-13.
Troubleshooting the
Cables
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 9-4 on page 9-12 for the
wiring information for each set of cables.
Table 9-3 SWITCH PORT 1/2 Connector Pinout
D-Type
Connector Pins
Function
D-Type
Connector Pins
Function
1 Bit 6 HI 14 Bit 2 HI
2 Bit 6 LO 15 Bit 2 LO
3 Bit 7 HI 16 Bit 3 HI
4 Bit 7 LO 17 Bit 3 LO
5
+ 12 Vdc 18 Bit 4 HI
6
+ 12 Vdc 19 Bit 4 LO
7 GND 20 Bit 5 HI
8 GND 21 Bit 5 LO
9 GND 22
+ 12 Vdc
0 Bit 0 HI 23
− 12 Vdc
11 Bit 0 LO 24 GND
12 Bit 1 HI 25 GND
13 Bit 1 LO