PPG Hints and Tips
This section is dedicated to the foibles and quirks of
|I have noticed that some PPG instruments have a
reputation for being unreliable. This is probably as a direct result of
them being at the limit of the technology available at the time. Justified
or not, some of their odd habits are what makes them so character full,
others are just damn annoying!
|Many people have said that one should
"never use a PPG on stage" but may be the same could be said
about a small fragile wooden stringed instrument liable to go out of tune
at the slightest change of temperature or humidity and that may cost many
tens of thousands of pounds! As with the violin, many high-profile
aficionados have proved this sweeping statement to be wrong. Having done a
few basic service procedures, mine has (touch the wooden end-cheeks of my
Spirit) been very reliable.
|Whilst I am an ardent fan of Palm's creations I
will admit that there are a few points to be aware of when becoming
the proud owner of one...
|Wobbly Foundations Some of the system
instability of machines like the Wave 2.3 can be attributed to the
slightly under specified PSU. The poor thing is run flat out, with the
regulator on the back panel reaching flesh-meltingly high temperatures!
So over stressed was the PSU in my Waveterm B that it blew the bridge
rectifier. This was a scary time as I thought it would the end of
the poor thing, but after some serious surgery it clunked its way back to
life again. As with the electronic design of the PSU, the mechanical
aspect of it seemed to be an afterthought too. In order to avoid the same
situation arising, a higher spec bridge is recommended, if a little fiddly
The offending PK10-EDI-8345
|An early sign that all is not right with your
Waveterm is that of a wobble in the displayed image that moves vertically
across the screen. This usually means that the capacitors in the PSU are
going to fail imminently! (this was linked in with the afore mentioned
bridge rectifier failure)
|Stop Whining! The first thing I
noticed with my Wave 2.3 when it arrived, after reveling in the big
blueness, was the fact that the back-light on the LCD didn't work. Minutes
later, having lifted the front panel and re-attached a simple loose wire,
I stood back and admired my handywork. Still basking in the glow of the
little LCD I turned up the mixer channels expecting to hear the familiar
clangorous tones only to be assaulted by a hideous high pitch whining
noise! Aagh, what have I done, I've broken the wretched thing just 10
minutes after unpacking it!
|Having done a little research on the matter, I
discovered that this is a common fault, and is due to the high voltage
inverter circuit for the LCD back-light.
|(Paul Maddox has a good section on this at
|To be continued...