Friends I have the following problem with this brand Minipa ET-3960 ammeter clamp when turning on the HOLD, RANGE, SEL buttons, they press themselves thinking that it was worn rubber or some sulfate inside the tracks to get out of doubt if it is the buttons that are sulfated or the tracks that are making short in the integrated one that uses the FS9721_LP3 disconnect from the pcb the pin 31,32,33,34 which those pins correspond to SELECT, RANGE, REL, HOLD and when turning it on again it continued with the same fault check each of the components associated with it and all the capacitors and resistors were in good condition then remove the resistance of 1mega ohm in the 4mhz quartz oculator the equipment now works perfectly all its buttons and the fault did not turn to produce but sometimes it is difficult to turn on reading the manual mentions that this resistance is to stabilize the frequency or start-up of the ocilator my question is, will it be that the quartz crystal is damaged or Is this out of frequency at which it works? Why does eliminating the resistance that goes in parallel with the quartz crystal work correctly only sometimes it costs you to turn on? In the event that it is not the crystal, will it be that the integrated has a short or is being damaged? 1mega ohm resistance is in good condition. I don't have another 4mhz crystal to get out of doubt.