FIREPHIGHT
Member
I have hooked up all power wires including the ignition wire and nothing.I have other tk radios and they all power on just fine . need HELP
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tk-790 will not power on
- Thread starter FIREPHIGHT
- Start date
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You have 12 volts on both the red and yellow power wires? The yellow ignition sense should go to pin one of the white molex connector on either the radio chassis or the head.
If a remote mount, make sure the control cable is firmly seated on both ends. Later 790s the connector has a positive click when you push it on. Sure helps.
Other than that, most common is a blown internal fuse. A little surface mount guy, 1.8 amp.
If a remote mount, make sure the control cable is firmly seated on both ends. Later 790s the connector has a positive click when you push it on. Sure helps.
Other than that, most common is a blown internal fuse. A little surface mount guy, 1.8 amp.
FIREPHIGHT
Member
where is the surface mount fuse at i am sure thats the problem
If you wired the radio with reverse polarity and it did not blow the buss fuse in the + lead then you are going to have to spend some $$ !
There is a surface mount diode, but I suggest taking the radio to a tech to repair it.
73,
n9zas
Take the cover off the control board (the side with the DB-25 rear connector). It will be towards the front of the board just behind the white connector. Take a voltmeter to it. If it's good you'll have 12V on both sides. If it's blown, one side will be 0V.
In a pinch, you can cripple across it with a green pico fuse (like I've done in my personal radio).
There is another fuse on the board but that only protects the accessory connectors.
In a pinch, you can cripple across it with a green pico fuse (like I've done in my personal radio).
There is another fuse on the board but that only protects the accessory connectors.
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FIREPHIGHT
Member
update
ok l checked the voltage at F502 and was 13 v checked at F501 nothing
ok l checked the voltage at F502 and was 13 v checked at F501 nothing
F-502 has 13V both sides? Then nothing at F-501. Let me grab a schematic and refresh myself. I'll get back to you.
VIA TAPATALK
VIA TAPATALK
Well DUH! F-501 will not have any power to it unless you put a solder blob on the SB jumper right next to it. But don't worry about it, it's only for the DB-25 accessory connector, shouldn't affect the ability of the radio to power up.
If you feel F-502 is good, there's only a couple of things to check.
The ignition sense jumpers R-504 and R-506. They are at the back of the board by wiring connector CN-506. If you have the yellow ignition lead, R-504 should be missing and R-506 in place. This would allow the ignition lead to control the radio power. Default from the factory R-504 is in and R-506 is missing. In this config, only the power switch controls the radio regardless if there is voltage on the yellow lead or not. If both R-504 and R-506 are missing, this is not allowed and the radio will not power up.
The only other thing I can think of to check is the PS line. Go back to F-502 and the connector next to it and you will see if a wire labeled "PS" (power switch). If you can get a voltmeter probe on that through the top of the connector, you will see a 12 volt pulse when you press the power switch. If the fuse is good and the jumpers correct and you see this 12 volt pulse, you're problem lies in the radio control board. If you cannot detect a 12 volt pulse there, then the control head needs to be looked at.
Beyond all this, you will need to have a tech with a schematic to troubleshoot where the problem is.
If you feel F-502 is good, there's only a couple of things to check.
The ignition sense jumpers R-504 and R-506. They are at the back of the board by wiring connector CN-506. If you have the yellow ignition lead, R-504 should be missing and R-506 in place. This would allow the ignition lead to control the radio power. Default from the factory R-504 is in and R-506 is missing. In this config, only the power switch controls the radio regardless if there is voltage on the yellow lead or not. If both R-504 and R-506 are missing, this is not allowed and the radio will not power up.
The only other thing I can think of to check is the PS line. Go back to F-502 and the connector next to it and you will see if a wire labeled "PS" (power switch). If you can get a voltmeter probe on that through the top of the connector, you will see a 12 volt pulse when you press the power switch. If the fuse is good and the jumpers correct and you see this 12 volt pulse, you're problem lies in the radio control board. If you cannot detect a 12 volt pulse there, then the control head needs to be looked at.
Beyond all this, you will need to have a tech with a schematic to troubleshoot where the problem is.
FIREPHIGHT
Member
ok thanks ramal121 I got this radio for free and it come out of one of our old work trucks that got a lot of abuse so who knows what realy happened to make the radio stop working . I know one of our old trucks had a radio that would just shut off for no reason this might be the one
FIREPHIGHT
Member
FIREPHIGHT
Member
checked again at F502 and it is blown soldered a jumper on, and the radio powered up. crazy i was also looking at R742 and R743 are ign sence jumpers
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