Hi all, I have a JVC HR-S9400U VCR that was "shutting off" (dead) when a tape was inserted. I suspected of E.Capacitors in power supply and some E.Caps in mainboard. I checked all eletrolitics and resistors in the supply and some in mainboard and all seems to be ok. Suddenly, four days later the vcr was working normally. One month later the problem was back. Then i checked the supply again (All E.Caps. and Resistors and some in mainboard) and all was ok. I thought than problem was in the mode swich. I have replaced it and with the service manual help i assembled and re-aligned it, but now the unit has the following problem:
Fault 1 When I plug it in, the clock shows "--:--" (not flashing). Now, when I push the power button while no tape is inserted, the display shows "channel au" and the loading motor spins in one direction for 1/2 second aprox., then in the other direction imediately (the control cam gear spin a little in clockwise and vice-versa and control plate slide to right and left), then the unit shuts off imediatelly (shows --:--). I hear the drum motor noise (it doesn't spin), and nothing happens. If I press eject nothing occurs. If i insert a tape (a little bit), the unit thinks the tape is fully loaded and the pole base assembly only move through about 0,5cm of their full travel sequence, then the unit turns off (shows --:--). At no time does the head drum spin (only noise again).
Fault 2 For power surge test purposes, i remember that i was testing this vcr without the mechanical assembly in it. It remained "on" until i press Power again. Now i can't do that. Turn of in 2 seconds. Is there a way to make the VCR stay "on" again without the mechanical assembly in it.
I hope you can help me.
Thanks
Antonio