If you are getting input voltage low and the cable is not your problem then you need to change your pcb component. You will probably not be able to do this yourself ....go to humminbird website and call them to send it off for repair.
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Really need to know what equipment you're having trouble with. Provide make and model and info on power source (battery, DC power supply...)
In general though, if you can sample your input voltage near the unit with it still plugged in (use pointed probes or skin back wire insulation) and see what the voltage is with the unit turned on. If it drops when you turn it on, look for a bad connection in the line going to the source.
No make and model # makes answering difficult so I'll have to give very general information. Also I'm assuming this is well out of warranty - otherwise call the manufacturer first. Now, when we start without any schematic we trace backwards from where we know the circuit should end. In this case you start at the battery terminals since you're trying to find the charging circuit. It is more difficult today since if there's a microprocessor in the mix it could be controlling when a given line is active, when the charging line is connected to the battery, or not. The charging circuit will be a constant-voltage circuit for Li-Ion batteries ~ 3.7 Volts depending on the battery. If it is Lead-Acid it will probably be 13.8 - 14.0 volts, if Ni-Cd or Ni-MHd then it depends on the size of the battery pack and again will probably be a max voltage of about 1.25V/cell * Number-cells. Once you find the circuit you can test to see if there is any output voltage and current when it is "on" - if it never turns on then the problem is either the circuit is dead or the CPU is not turning it on - if the CPU controls this. If you can find the line from the CPU to the charging circuit see if it ever changes state, if not you could try "forcing" a different state, ie, it the state is always off (usually a 0 Voltage) then try finding the voltage line to the CPU and place that voltage on the CPU to Charger circuit line. If the line is always high (anything from 3.3 V to probably 5V depending on the CPU's power requirement) then try lowering the voltage to a 0 state. This is much more difficult since it may require cutting the line from the CPU to the charger. If either of these gets the charger to work then the problem is with the CPU, if nothing gets the charger to work the problem is the charger.
There are a couple of things that could cause the radar to power off when going into the transmit mode.
The first thing to eliminate is input power. When in the standby mode the radar draws less current than in the tx mode so if you have low voltage for whatever reason, that could cause a shut down. Check all connections and measure the voltage to the unit while it is on.
A problem with the antenna motor or gear box could also be the problem. The antenna doesn't rotate unit the unit is switched to the tx mode. You would need to remove the dome cover (with unit off) and verify that the array will turn freely by hand. Typically, a bad motor will not cause a shut down but a physical obstruction could.
Focus on the power issue because that's the most common problem. Be aware that you need to measure the voltage as close to the radar display as possible and watch the voltage as you switch the radar from standby to transmit for a quick dip in voltage.
Sounds like you may have an issue with low voltage to the unit. First verify your battery is in good condition. Connect the new power cable directly to the battery using appropriate fuse and test. If the problem goes away then the problem is with the wiring between the battery and the head unit.
How do you get the PCB out all the 4 screws are out and clips are pushed off the pcb contacts on the sides. Unscrewed the antenna, but not the soldered in bulk antenna mount. I is still locked in somehow? how do I get the board out to look at the keypad buttons so I can see if threre is a bad contact?
In a pinch, probably. For long term, no. ther eason being that you cannot get a good enough connection on the jacketed cable to make the sounder work properly. That and the fact that there is alot of voltage running through the wire! Best to replace it.
Hi ,The 9105 PTU Takes the ships mains from the PCT 9106 PCB make sure you have the supply form the PCT board ready which is a protection circuit ,should you have an overload from the modulator pcb then the pct board shall inhibit the supply to the ptu 9105 ,so here is what you have to do ,disconnect the HV 330 volt going to the modulator pcb and then switch supply on ,ensure your fuses are all fine .fond email@example.com