Found any bad/open fuses yet?
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I joined the cult (New XG-100M owner)
- Thread starter Teotwaki
- Start date
Yup, the CAN Bus ground fuse. I jumpered it but the radio still does not fire up. Apparently there is a regulator underneath the big RFI can on the PA board. Looks to be a huge PITA to remove.
Whenever I have problems with one of these radios I always front mount the control head to eliminate the can bus. One less thing in the equation.
Merlin very generously mailed me a used/bad PA board so that I could look into the power regulation circuits. He had already cut the RFI can off so here is a picture with a few notes in red font as to what each regulator type is or at least the possible manufacturer based on the logo on the part. List by part ID below the picture
Q85 Analog Devices IC "ad7415" might be:
The AD7414/AD7415 are complete temperature monitoring systems in 6-lead and 5-lead SOT-23 packages. They contain a band
gap temperature sensor and a 10-bit ADC to monitor and digitize the temperature reading to a resolution of 0.25°C.
The AD7414/AD7415 provide a 2-wire serial interface that is compatible with SMBus and I2C interfaces.
U60 LMZ14202 DC-DC step down regulator
U61 LM2941 adjustable linear regulator
U63 LINEAR TECHNOLOGY possibly a LT3010 REGULATOR
U66 ANALOG DEVICES possibly a voltage regulator labeled LTZF 2C62e3
U70 LM2941 adjustable linear regulator
U74 M5201 by Microchip is a fixed voltage low dropout regulator
L158 Coilcraft inductor
Q85 Analog Devices IC "ad7415" might be:
The AD7414/AD7415 are complete temperature monitoring systems in 6-lead and 5-lead SOT-23 packages. They contain a band
gap temperature sensor and a 10-bit ADC to monitor and digitize the temperature reading to a resolution of 0.25°C.
The AD7414/AD7415 provide a 2-wire serial interface that is compatible with SMBus and I2C interfaces.
U60 LMZ14202 DC-DC step down regulator
U61 LM2941 adjustable linear regulator
U63 LINEAR TECHNOLOGY possibly a LT3010 REGULATOR
U66 ANALOG DEVICES possibly a voltage regulator labeled LTZF 2C62e3
U70 LM2941 adjustable linear regulator
U74 M5201 by Microchip is a fixed voltage low dropout regulator
L158 Coilcraft inductor
Based on some documents for previous radios and the "H" letters on the fuses I believe they are 1 Amp LittleFuse 1206 437 Fast SMD types.
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Scratch that part number and data sheet since I am too late to edit the original post. The SMD fuses are the smaller .0603 dimension such as the LittleFuse 434 and 494 series. Can be purchased at Mouser, Digikey, Newark and AliExpress.
If it helps, what Haris calls the 'PK' board is the logic, processor, controller board by other manufacturers.
This board on the componant side has the OMAP CPU, flash, ram, eeprom and Cyclone III DSP chip.
CAN Bus 1, 2, and 3 are test points for the CAN bus, Good scope test points. Directly on the other side of the board is the 3 pin hedder socket and plug that goes to the frame CAN bus connectors (paralelled)
Now the XG-75 PK board is very similar schematically, just don't go by any board plug or part location silkscreen.
The XG-75 does have a schematic available, helped me a lot troublshooting my bricked XG-100M.
Some things I noted is the CAN bus connections don't go directly to the CPU, there is a complicated switching network that ties it to the CPU serial port.
This board on the componant side has the OMAP CPU, flash, ram, eeprom and Cyclone III DSP chip.
IIR right the larger chips labeled 'fuse' are a larger bypass capacitor for power buses. One side will be ground.
CAN Bus 1, 2, and 3 are test points for the CAN bus, Good scope test points. Directly on the other side of the board is the 3 pin hedder socket and plug that goes to the frame CAN bus connectors (paralelled)
Now the XG-75 PK board is very similar schematically, just don't go by any board plug or part location silkscreen.
The XG-75 does have a schematic available, helped me a lot troublshooting my bricked XG-100M.
Some things I noted is the CAN bus connections don't go directly to the CPU, there is a complicated switching network that ties it to the CPU serial port.
Problem I had was the CAN bus failed response to the control head. control head to the MRU looked to be working as when I power up, the current draw on the MRU increased from standby to operate. Showd a componant failure somewhere in the switching circuit that separates the external CAN bus from the CPU. Never could find that. Because the DB9 RS232 also goes through the switching, the radio would not talk to the outside world.
I found your message with links to some manuals; Here it is for others M7300 & XG75 Manuals
The M7300 manual shows they are fuses, not capacitors being used to protect ground paths
I was also seeing control head odd behavior and incorrect current draw to the brick and that has lead me down this path. I t looks as id one of my two bench 12v supplies has problems and that might be what popped the 1A fuse on the CANBUS ground path. I need to locate the other fuses in the XG100 that handle current higher than 1 Amp
Splinter34: I've been meaning to thank you for the suggestion and I have to take a spare CH721 and program it for front mount operation.
On the main RF board there are some interesting parts for the ignition control line. In series is a part marked LF030, PCB designation Z20. Instead of a fuse that pops they are using a PTC: Polymer Positive Temperature Coefficient devices "provide overcurrent protection for applications where ultra low internal resistance, ultra low voltage drop and automatic resettable protection are desired".
Based on its dimensions it might be this part number from the Littlefuse catalog "PTCcatalogDesignGuide"
VR7 is marked on my board as a GFG23A and may be a transient voltage suppressor but I've not yet located a data sheet.
Based on its dimensions it might be this part number from the Littlefuse catalog "PTCcatalogDesignGuide"
VR7 is marked on my board as a GFG23A and may be a transient voltage suppressor but I've not yet located a data sheet.