Synthesizers and Samplers
CAT
Legendary Duophonic Analog Synthesizer
with Dual VCOs, 4 Mixable Waveforms,
External Signal Processor, 16-Voice Poly Chain,
and Eurorack Format
User Support Bulletin
Introduction
The unit is carefully calibrated at the factory. The performance may change over time or due to environmental changes,
and the following recalibration procedures can be used to bring it back to its factory settings. If you do not feel comfortable
doing these calibrations, then we recommend they are done by an experienced audio service technician. This is especially true
for those units that need to be opened to gain access to voltage test points and calibration potentiometers.
CAUTION: Incorrect calibration or damage to the delicate adjustment potentiometers may lead to the unit
becoming inoperable.
Note: Although re-calibration will not invalidate the warranty, any damage caused during re-calibration may invalidate
the warranty.
Equipment required
1. Small insulated trimmer screwdriver.
2. Small Phillips screwdriver.
3. A at sheet of cardboard or another insulator as wide as the unit. (This will help prevent damage to the top panel when it is
inverted and resting on the bottom chassis).
4. Digital DC Voltmeter with a scale that can display accurately to 0.001 V.
5. Guitar tuner
6. An external MIDI keyboard of at least 6 octaves including A1 and A7.
7. MIDI cable.
8. Pair of headphones or a sound system to monitor the main output.
Important Note:
Leave the unit turned on for approximately 30 minutes. This will allow the circuits time to warm up and the components and
performance to stabilize with temperature. Without this warm-up time, the calibrations will be inaccurate.
985-40000-01170 Rev.A
2021-02-02
Condential, for internal use only. Not to be reproduced.
page 1 of 6
Synthesizers and Samplers
CAT
Preparation
Follow all steps in the order in which they are presented.
Remove all cables and connections to the unit.
Remove the 8 screws holding the top panel to the chassis.
Turn over the top panel to gain access to the bottom surface of the printed circuit board (pcb). Be careful not to strain
the ribbon cables. Use the cardboard to protect the top panel.
Caution:
Make sure that the circuit board is not touching any bare metal that may cause a short circuit and damage the unit.
Do not touch the circuit board while the unit is powered up.
Carefully connect the power and turn on the synthsizer.
Leave the unit turned on for approximately 30 minutes.
985-40000-01170 Rev.A
2021-02-02
Condential, for internal use only. Not to be reproduced.
page 2 of 6
page 2 of 6
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