[TechAssist] Re: JVC AMPLIFIER MODEL NO. RX 718VBK
- From: "Mike Jensen/Sound Pro" <soundpromikej@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 3 Nov 2005 10:01:25 -0700
I'm not sure if this applies to your model, but I recall that on some
older JVC amps they used the bottom cover to complete the ground plane.
With the bottom off they would not have audio unless you grounded some
of the points that the bottom cover contacted.
Mike Jensen
Sound Pro
Rapid City, SD
mikej@xxxxxxxxxxxxxxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Gary Pahls
Sent: Wednesday, November 02, 2005 6:17 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: JVC AMPLIFIER MODEL NO. RX 718VBK
Are Q731 & Q733 In the same channel? If so whenever I troubleshoot an
amp
without a manual I leave the deffective outputs out a fire it up to see
if
the other channel works OK. If it does then I use it to troubleshoot
the
bad channel. I'm assuming you checked for proper B+ , B- and bias on
the
transistors you changed. Also, don't be brain dead like I am some
times,
make sure the tape monitor in not on and check to see that there is not
an
open preamp loop on the back of the unit.
Gary Pahls
Beloit Entertainment Center
bec@xxxxxxxxx
----- Original Message -----
From: "R&S ELECTRONICS" <rselect@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, November 01, 2005 8:46 PM
Subject: [TechAssist] JVC AMPLIFIER MODEL NO. RX 718VBK
> Hi Techs
> The unit came as dead only standby light was on. Troubleshooted found
> fuse, Q731(2SB2155) Q733 (2SB1429) was bad. Replaced with NTE 2328 &
2329
> now the set comes on but no sound. Working without the schematic,
anybody
> has any tips/hints what should I look for.....
> Are these NTE parts compatible for above unit.
> Thanks
> R&S Electronics,PA
> TEL(717)532-6312
> Email:rselect@xxxxxxxxxxxx
>
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