Re: Aiwa NSX 999 Service manual

Arfa Daily wrote:
"Jazzer" <bertda@xxxxxxxxx> wrote in message
news:1160447215.621402.93720@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Can anyone tell me of a URL where I could download a Service Manual for
Aiwa NSX-999 compact disc stereo system.I have downloaded circuit
diagrams only to find they do not match the unit although listed as
NSX-999.
My model has two FL displays on the front, shown as FL500 & FL501.( one
being a separate Graphic Equalizer display) The circuit I have shows
only a FL200 yet page is headed NSX-999.

Identification No. on mainboard is 83-NF6-622-199 with HEHR, and on
front board 83-NF6-611-219.
Help appreciated. Jazzer.

Presumably, you are still having trouble getting the displays to work ? Did
you determine if
the -30v was present ? You can measure it up at the front panel by checking
between chassis and any of the VFD heater pins, as the low AC which
energises the heaters, is 'floated' on the negative supply to reduce the
voltage differentials within the display. If the -30v is missing, it will be
one of the multiplier caps open, and these are easy to locate without a
schematic, if you have access to a scope, or even at a pinch an AC meter.

Arfa
Your presumption is correct Arfa, I have not found the open capacitor
and there is no AC component on the heater pins other than a small
reading of 2.7v AC. I shunted a number of electros in turn in the area
of the main board that seemed to me to be the most likely area with a
4.7uf 50v electro but no display resulted. Do not have a scope (my own
homebrew 5meg scope went some years ago) only good analogue and digital
multimeters.Still floundering and regret my lack of electronic
knowledge which is unfortunately compounded with my advanced years.I
was an enthustiastic experimenter and licenced amateur years ago and
have even built and used my own homebrew radio gear, from the "big
bottle" days, then to making my own digital readout modular solid state
multi band HF Transceiver. Seem to have lost my memory of the
technicalities of all this.
Thanks Arfa for your continued interest and patient advice. Jazzer.

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