Ремонт прошивка восстановление ICOM

simkard · 01.06.2024, 09:49

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===== English (I apologize for the usage of english) =====

Dear All,

I'm writing here as I want to upgrade my chinese clone ICOM Next to the latest firmware available ... which means I will need to do some electronics first.
...

IMGBB picture codes seem to fail so here they are again :
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simkard · 01.06.2024, 13:12

My measurements with components still on board (without unsoldering each of the resistances // I'll do it when I'll receive the new resistances)

RESISTANCES

R15 : 26 ohms (should be 52 ohms)
R101 : 7 kohms (should be 22 kohms)
R102 : 6.9 kohms (should be 10 kohms)
R119 : 1 kohms (should be 1 kohms) // This one is tricky as it shows correct 1k value, but it is not ! As someone else reported, once unsoldered, the correct value shown is 10 kohms so it should be replaced with a 1 kohms
R156 : 230 ohms (should be 70 ohms)
R155 : 70 ohms (should be 230 ohms)
R178 : 1.48 kohms (should be 10 kohms)
R179 : 10.33 kohms (should be 1.4 kohms)
R195 : 0.5 ohms (should be 38 kohms)
R233 : 7.66 kohms (should be 47 kohms)
R280 : 12.86 kohms (should be 38 kohms)
R285 : 12.81 kohms (should be 38 kohms)
R292 : 230 ohms (should be 70 ohms)
R293 : 70 ohms (should be 230 ohms)

VOLTAGES

RAM Vdd = +2.96v (should be +2.5v) // Well too high as from datasheet it is supposed to be +2.5v
RAM Vref U18 : +1.48v (should be +1.25v)
RAM Vref U19 : +1.48v (should be +1.25v)
RAM Vref U20 : +0.27v (should be +1.25v) // This is the one driven by R119
RAM Vref U21 : +1.48v (should be +1.25v)
RAM Vref are lightly too high based on datasheet informations : it should be 0.5 X Vdd ... so if powering RAM chips with +2.5v ... it makes +1.25v

01.06.2024, 13:12	#2 (permalink)
simkard Новичок Регистрация: 29.05.2024 Сообщений: 13 Вы сказали Спасибо: 0 Поблагодарили 0 раз(а) в 0 сообщениях Сказал(а) Фууу!: 0 Сказали Фууу! 0 раз(а) в 0 сообщениях Откуда: France Авто: BMW 740d (E65) + tweaked many other BMWs	My measurements with components still on board (without unsoldering each of the resistances // I'll do it when I'll receive the new resistances) RESISTANCES R15 : 26 ohms (should be 52 ohms) R101 : 7 kohms (should be 22 kohms) R102 : 6.9 kohms (should be 10 kohms) R119 : 1 kohms (should be 1 kohms) // This one is tricky as it shows correct 1k value, but it is not ! As someone else reported, once unsoldered, the correct value shown is 10 kohms so it should be replaced with a 1 kohms R156 : 230 ohms (should be 70 ohms) R155 : 70 ohms (should be 230 ohms) R178 : 1.48 kohms (should be 10 kohms) R179 : 10.33 kohms (should be 1.4 kohms) R195 : 0.5 ohms (should be 38 kohms) R233 : 7.66 kohms (should be 47 kohms) R280 : 12.86 kohms (should be 38 kohms) R285 : 12.81 kohms (should be 38 kohms) R292 : 230 ohms (should be 70 ohms) R293 : 70 ohms (should be 230 ohms) VOLTAGES RAM Vdd = +2.96v (should be +2.5v) // Well too high as from datasheet it is supposed to be +2.5v RAM Vref U18 : +1.48v (should be +1.25v) RAM Vref U19 : +1.48v (should be +1.25v) RAM Vref U20 : +0.27v (should be +1.25v) // This is the one driven by R119 RAM Vref U21 : +1.48v (should be +1.25v) RAM Vref are lightly too high based on datasheet informations : it should be 0.5 X Vdd ... so if powering RAM chips with +2.5v ... it makes +1.25v