Pro-433 intermittently stuck in Wired mode

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S1MPLET3XT

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After programming this scanner and installing it in my car it suddenly got stuck in wired mode and wouldn't go out of it even after a reset; so I took it out and opened her up and disconnected the wires leading to the PC/IF jack. This seemed to solve the problem at first so I hooked it back up and reprogrammed it and I thought I had it working again...

Nope; now when I turn it on and start scanning I get about maybe 2-3 minutes and then it goes back into wired mode and automatically resets itself after around 30 seconds; after which it scans for a brief second then goes back into the same cycle.

Has anyone else had this problem or know of any solution? Does anyone have the service manual .pdf so that I might trace it to the board? Maybe a bad component?

Thanks in advance!
 

pro92b

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If you again disconnect all the wires to the PC/IF jack, does the problem go away? If so it is probably the jack that is causing the problem. The diagram below is from a PRO-528 which should be similar to the PRO-433. When a plug is inserted into the jack R399 (4.7K) is connected to PC_DET which pulls up the voltage to 3 volts. This alerts the CPU that a cable is plugged into the PC/IF jack. Your radio appears to have an intermittent short in this path and you can check the voltage at TP356 to see if it is around 3 volts (it should be zero) with no cable plugged in to the PC/IF jack.
 

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S1MPLET3XT

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Jan 8, 2009
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simpletext@gmail.com
This is what it does with the PC/IF component completely unplugged from the main board... when it is plugged in it does not scan at all and stays shorted in wired mode... I just can't understand why it goes into wired after awhile without the PC/IF plugged in at all, it seems that should make it stay in scan mode... hrmmm... Anyways, thanks for the detailed info(s)! I will have another go at it when I get back to the shop later this week!
 
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