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JVC S-VHS HR-S9400U shutting off

A

Antonio

Jan 1, 1970
0
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
 

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