Rhodes Chroma Zone
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Here you can find useful products, documents or service hints for
equipment manufactured by Rhodes. The following matrix shows the three main
categories and all new items are marked with a little asterisk *.
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Defective voice repair NEW!
Chroma shows an error after tuning or a voice sounds stragely then
in the most cases a voice card is broken
There is no reason for worrying
If one voice voice is
detuned, some sounds are distorted or sound brighter, then there is absolutely no reason for worrying. We have long term
experience with Rhodes Chroma equipment and we can solve your problems quickly and
efficiently. In the very most cases there isn´t any need for you to
send the whole instrument. We need only the particular defective board
which will be checked and repaired in our test system.
Rhodes Chroma´s voice architecture
The Chroma contains
8 voice boards which contain the electronic to produce 8 (double
mode) or 16 voices (single mode). Therefore one board has two
independent oscillators, filters and aplifiers as well as a complex
modulation matrix to allow frequency modulation, ring modulation and
Finding the issue
most common way to realize an issue is the display output after
tuning. If the Chroma was not able to tune e.g. card 2 and card 5
properly the display shows "ERR 25" and both cards are disabled -
means that the synthesizer works with the remaining 6 cards and
therefore the poliphony is reduced to 6 or 12 voices (depending on
the used mode). The right hand picture shows the position of the
particular voice board.
Sometimes all 16 voices are tuned properly but anyway there is
something fishy going on: One oscillator sync does not work, a
particular filter mode does not sound correctly or a voice suffers
from a mellow and "indirect" sound.
With special commands you are able to find the defective card by
yourself. Simply play the keyboard (one note at once) as soon as you
hear the suspect voice. Hold the key and press <SET SLPIT> + <7> at
once. This command disables the currently played note and the
display shows the message "ERR 4" - if it is the card no.4.
There are several helpful commands:
<SET SPLIT> + <6>:
battery test, shows the battery voltage which should be more then
<SET SPLIT> + <7>:
disables the currently played voice; confirms with e.g. "ERR 6" for
voice board #6
<SET SPLIT> + <8>:
shows all disabled boards, e.g. "0123" for the first four disabled
<SET SPLIT> + <26>:
disables all A-oscillators
<SET SPLIT> + <27>:
disables all B-oscillators
<SET SPLIT> + <28>:
enables all previously disabled oscillators
<SET SPLIT> + <31>:
special reset, tuning does not disable suspect voices
If you suspect a
bad voice and do not want to find out the bad card then it will be
easier for you to send us all 8 voice cards. We will check them in
our testing system and write a comprehensive service- and
status-report. Having all cards here we will service the card (e.g.
chaning the old capacitors of the audio path; "recapping") which is
a good idea anyway. after 30 years of operation. :-)
Removing the defective board
Power down the synthesizer
and disconnect the power cable.
remove the four screws on the upper side and the 9 screws on the
backside. Please see the green arrows.
CAUTION: The grounding cable is connected to the chassis with
a bolt and a nut; red arrow. Do NOT
loose this screw since this cable is essential for your personal safety.
Open the top chassis and place it beside the Chroma so that the
grounding cable is not disconnected or broken. Now you have unlimited
access to the voice cards.
card, wrap it into antistatic foil first. If you need technical assistance or
support, please contact us. The Rhodes Chroma is a very complex and sensitive
device and should be treated with respect.
If you want us to repair your Rhodes Chroma
synthesizer, please get in contact with us before
sending any equipment. After clarifying all details please fax us the completed
order form for synthesizer service , or put it into the card´s
Other problems with your Rhodes Chroma?
Of course we can repair
other defects fast and effectively, too. If you have any problem with your
synthesizer, please contact us. We are happy to help you!
(C) Virtual Music´s
Synthesizer Repair Service
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