Coda CP User manual

TECHNOLOGIES INC.
Preamplier CP
OPERATION MANUAL
SAFETY PRECAUTIONS 1
INTRODUCTION 2
INITIAL SETUP 3
LOADING SETUP 5
TECHNICAL DATA 6
CARE & HANDLING 7
WARRANTY & DISCLAIMER 8
WARRANTY REGISTRATION 9
ULTRA CLASS A FET PREAMPLIFIER
BAL PHONO CD VIDEO AUX PROCESSOR MONO
CP
VOLUME
dB
MAIN LEFT RIGHT

!
CAUTION
CAUTION
WARNING
WARNING !
SERVICING TO QUALIFIED SERVICE
CAUTION: TO PREVENT ELECTRIC SHOCK,
DO NOT REMOVE COVER. NO USER
SERVICEABLE PARTS INSIDE, REFER
PERSONNEL.
THIS SYMBOL IS INTENDED TO ALERT
YOU OF THE PRESENCE OF IMPORTANT
OPERATING AND MAINTENANCE
INSTRUCTIONS IN THE LITERATURE
ACCOMPANYING THE UNIT.
THIS SYMBOL IS TO ALERT YOU OF THE
PRESENCE OF UNINSULATED DANGER-
OUS VOLTAGE WITHIN THE UNIT'S
ENCLOSURE THAT MAY BE OF SUFFI-
CIENT MAGNITUDE TO CONSTITUTE A
RISK OF ELECTRIC SHOCK.
1SAFETY PRECAUTIONS
WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT
EXPOSE THIS UNIT TO RAIN OR MOISTURE. TO
AVOID ELECTRICAL SHOCK, DO NOT OPEN THE
UNIT. REFER SERVICING TO QUALIFIED PERSONNEL.
Never install or remove the power cord from the chassis
unless it has been disconnected from the AC power source
rst.
Never pull on the power cord when removing it from an AC
power source. Grasp it by the plug.
Do not leave the power cord connected to an AC power
source unless it is connected to the unit.
It is recommended that during extended periods of nonuse
the unit's power cord be unplugged from its AC power
source.
Route the AC power cord so that it will not be damaged or
walked on.
CAUTION -
-
-
-
-

2INTRODUCTION
Thank you for purchasing the PREAMPLIFIER CP.
This preamplier is a precision device, designed in an eort to
provide the listener with unmatched sound quality through superb
design and construction.
Although its operation is fairly simple, in order to operate your
preamplier properly and to realize all of the capabilites of the CP
we recommend that you read this entire manual carefully.

3
INITIAL SETUP
Note: Many ampliers produce a local magnetic eld that can be picked up by the
sensitive circuitry of a preamplier. Try to provide at least a foot of space between
your amplier and your CP preamp.
The diagram below illustrates the rear connections of the CP.
A B C D
USE ONL Y WITH 25V FUSE
D: Signal input is through two balanced XLR connectors and eight unbalanced RCA
connectors. The XLR receptacle has ground on pin 1, positive on pin 2 and negative
on pin 3.
C: The Processor loop connectors permit the connection of an external audio
device such as a surround sound processor or equalizer. Connect the output jacks to
the input of the processor, and the output of the processor to the processor input
jacks of the preamplier.
B: Signal output is through two balanced XLR connectors and four unbalanced RCA
connectors. The XLR pinout is identical to the input receptacles.
A: The AC receptacle accepts any standard three-prong IEC line cord. Power input
can be adjusted for any country, but is set internally at the factory. Contact Coda or
your local Coda dealer if the voltage must be changed. Fuse specications are
listed below the receptacle, and the fuse can be changed by unplugging the line
cord, pulling out the fuse drawer and clipping in a new fuse.

4
INITIAL SETUP
Note: Many ampliers produce a local magnetic eld that can be picked up by the
sensitive circuitry of a preamplier. Try to provide at least a foot of space between
your amplier and your CP preamp.
The diagram below illustrates the front panel controls of the CP.
E C D B A
VOLUME
MAIN LEFT RIGHT dB ULTRA CLASS A FET PREAMPLIFIER
CP
BAL PHONO CD AUXVIDEO PROCESSOR MONO
A: The rotary controller adjusts the currently selected volume level. Press the knob to
switch between the volume setting for le, right or both channels, indicated by the
lights underneath the digit display.
B: The digit display shows the currently selected volume setting. The lights under-
neath the digit indicate which value is selected. The readout is in dB of attenuation,
therefore a higher number indicates a lower output level. If the output is muted the
display will ash repeatedly.
C: The processor input mode passes the current audio input through an external
processor unit before it is output. See the previous page for instructions on connect-
ing a processor device.
D: The mono input mode combines both input channels into a single monaural
signal and outputs the combined signal on both output channels.
E: The four input selectors choose the current active audio input. Individual gain can
be set for each input. Press and hold the button for the appropriate input. The
display will switch to the gain setting for that input, 00 by default. Rotate the volume
knob to select up to 18 dB of additional gain, then press the input button again to
store the value.

5
LOADING SETUP
Caution: The CP contains dangerous high voltages during operation, and except for
the loading settings has no user servicable parts inside. Except when adjusting the
loading you should never open the preamplier. Before opening the CP ensure that
the AC line cord is completely disconnected.
The CPs phono input stage has adjustable loading parameters. The loading switches
are a red DIP switch block located on the printed circuit board inside the preamplier
near the balanced input jacks.
To open the CP, use a hex wrench to remove the bolts retaining the top cover. Check
the size of your wrench before beginning. An undersized wrench will strip the heads of
the fasteners. Be sure to set the cover top-side up when removed to avoid scratching
the nish.
The DIP block adjusts both loading capacitance and resistance. The switches are set in
stereo pairs, e.g. 1 & 8 to add 1000 PF to both channels, 2 & 7 to add 200 PF, etc.
The components are switched in parallel with the built-in values of 47k Ohms and 50pF.
The nal capacitance is the sum of 20pF and the two capacitor settings. The nal resis-
tance is as follows:
1/Rtotal = (1/47000)+(1/R1)+(1/R2)
The two slide switches to either side of the DIP block add 20 dB of gain to each chan-
nel. By default they are disabled.
If you have any questions about adjusting the CP you should contact Coda Technolo-
gies at the address and phone number on the rear of this manual.
100 Ohms
20 dB 20 dB
1000 Ohms
200 PF
1000 PF
100 Ohms
1000 Ohms
200 PF
1000 PF

6
TECHNICAL DATA
Frequency Response: 5Hz to -3dB at 200kHz
2.5” Faceplate, 3.0” Overall
17.0” Faceplate, 17.0” Chassis
12.0” Overall
15 lbs.
20 Watts
<.02 from 10Hz to 40kHz, 6V peak into 600 Ohms or higher,
shunted by 1000pF or less
12dB, variable to 30dB
10V peak
Less than 100dBA referenced to 1V
20k Ohms unbalanced
20k Ohms balanced
50 Ohms nonreactive unbalanced
100 Ohms nonreactive balanced
90dB at 20kHz
Distortion:
Gain:
40dB at 1kHz, 60dB with extra gain switchGain:
Maximum Output:
Noise:
input Impedance:
Output Impedance:
Crosstalk:
DIMENSIONS
PREAMPLIFIER
PHONO STAGE
Height:
Width:
Depth:
Weight:
Power requirement:

7
CARE AND HANDLING
The interior of the amplier requires no special care. If exterior cleaning beyond simple
dusting is required, any dilute ammonia-based product is recommended. Do not use
any abrasive rags, cleaners or chemical solvents on the amplier.
When handling the amplier, take care not to mar the faceplate. Aluminum is a
medium hardness metal and can be scratched by harder tool steels, and the grained
surface can be easily marred if the amplier is set face-down on a hard surface. Do
not rest the amplier on it’s faceplate.
The amplier should not be lein direct sunlight or exposed to intense heat to avoid
damage to internal components or nish.
It is recommended that you do not throw away any shipping material. The box and
packing materials are ideal for moving, and if any service is required they will be
necessary for safe shipment.

8
WARRANTY & DISCLAIMER
i. Warranty - Any failure of the Coda product, herea er known as the product or
original product, to operate or to meet speci cations, applicable at time of manu-
facture, due to a manufacturing defect or component failure, will be corrected by
Coda Technologies without charge for parts or labor, for a period of ten years from
date of original purchase. Coda Technologies will provide for surface transportation
to and from the factory for a period of one year from date of original purchase.
ii. Procedure - If the product should require service under warranty contact Coda
Technologies at the location on the back cover of this manual for shipping instruc-
tions. Products purchased outside of the United States will be covered by the
warranty conditions extended by the importing distributor which may di er from
those given above.
vi. Unnecessary Service - In all conditions, if the product is submitted for service and
found to be operated without fault and within speci cations, shipping charges will be
billed to the customer.
v. Subjective Di erences - No guarantee is made that the product will perform to any
speci cations that cannot be measured and con med with precision audio analysis
equipment. Coda Technologies is only obligated to make repairs which will bring the
product into compliance with the speci cations stated in this manual.
This warranty gives you speci c legal rights. You may have other rights which vary
from state to state.
iv. Total Loss and Replacement - If the product is submitted for service due to a
severe malfunction which has caused damage su cient enough to make a repair
attempt infeasible, the product will be replaced with another unit of equal or superior
speci cations. Coda Technologies product line is frequently updated and changed,
and the speci c model and version of the original product may be discontinued at
any time without notice. In this case no guarantees are made that the replacement
unit will be visually similar to the original product.
iii. Exclusion of Coverage - Coda Technologies is not obligated to service the product
in certain conditions, as according to the following subsections.
In these conditions any service will be made at Coda Technologies sole option.
b. The product has been transferred to a third party. This warranty is valid only for
the original purchaser of the product.
c. The product has been transported outside of the United States of America.
i. operation not in accordance with the instructions in this manual
a. The product has been damaged through:
ii. abuse, tampering, modi cation or accident
iii. serial number defacement
Disclaimer - Coda Technologies cannot be held responsible for any damage caused
by their products, including but not limited to:
a. Damage to speakers caused by failure of a Coda Technologies product to
mute or disable itself as expected or described in its manual.
b. Damage caused by connecting a load to a Coda Technologies product
having an improper impedance as described in the products manual.
d. Damage caused by defects in design, construction or component quality.
Outside of the U.S., warranty is determined by local laws and regulations.
Please contact your distributor for details in your area.

MODEL DESIGNATION:
__________________________________
SERIAL NUMBER:
______________________________________
DATE OF PURCHASE:
PLACE OF PURCHASE
Dealer:
Address:
City: State: Zip:
Phone:
PURCHASER
9WARRANTY REGISTRATION
NOTES:
Name:
Address:
City: State: Zip:
Phone:
Fill in this registration sheet and fax or mail it to Coda Technologies to ensure
you are in our warranty system. This will facilitate warranty service should it
become necessary.
It is recommended that you retain a copy of this form for your own records.
Coda Technologies’ address and fax number are located on the back of
this manual.

SACRAMENTO, CA 95826 USA
TECHNOLOGIES INC.
7850 CUCAMONGA AVENUE #34
phone [phone]fax [phone]
on the web at CODA.CC
email us at [e-mail]