|
Craig gives good advice for the long term but I doubt it will fix the current problems.? You say the voltage measurements are near (+/- 5%).? That means the scope should run, just not be accurate in its measurements, timing or amplitudes.? Since the panel lights flash once, then nothing more its likely the problem is in the processor board.? Proper turn on sequence is for the lights to flash, then sequence through the channel indicators (ch 1, ch 2, ch3, ...) then finally stop at one of the lights lighted (an error condition, the lighted light indicates the error) or with all the panel lights in an operational state (completed power up).? Your scope does neither.? My bet is the A5 processor board has failed.? A VERY common failure is leaking capacitors destroy some surface mounted resistors on the A5 board.? You will need a service manual to trace and debug this fault.? I fixed exactly that on a 2445B today.
toggle quoted message
Show quoted text
On ?Monday?, ?April? ?2?, ?2018? ?10?:?02?:?09? ?PM? ?CDT, Craig Cramb <electronixtoolbox@...> wrote:
Power supply voltages are very important. I would recommend disassembly of scope and remove PS as a unit. Pay very close attention to the wiring connections. Then separate the inverter? and regulator boards. Start replacing the electrolytic capacitors. C1220,C1240,C1260,C1280,C1300,C1330,C1350 on the regulator board. Then C1111,C1110,C1102,C1101, C1113,C1116,C1114,C1115,C1132,,C1120,C1130, C1072,C1066.on the inverter board. You will definitely need service manual to ID these parts. Match the cap¡¯s with high quality Nichicon brand. 105c temp range and if exact values cannot be obtained you can up the microfarad value up 5% and you can double the voltage rating. Removal and replacement is very difficult if you don¡¯t have the proper solder/desolder unit. Don¡¯t overheat the circuit board. Craig On Mar 30, 2018, at 1:42 PM, fgswww@... wrote: |
