Nical N23 User manual

Analog CCD Camera N23 -8
[File: TV-CAM-ANA_E00R02.doc]
ANALOG CCD TV CAMERA -8

CCD CAMERA
N23
TV CAMERA FOR USE WITH
X-RAY IMAGE INTENSIFIER
Service Manual
October 2004 Release 1

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 1/20
SUMMARY
1. INTRODUCTION 2
2. SAFETY INSTRUCTIONS 2
2.1. Warnings 2
2.2. Environmental risks and disposal 2
2.3. Symbols 2
3. DESCRIPTION 3
3.1. Identification labels 3
3.2. Description 3
4. TECHNICAL DATA & CERTIFICATIONS 4
5. MAINTENANCE AND CLEANING 5
5.1. Maintenance 5
5.2. Cleaning 5
6. CCD CAMERA N23 DESCRIPTION 5
7. COMPONENT POSITIONS 6
7.1. POSITIONING OF CAMERA HEAD 6
7.2. POSITIONING OF CCU 6
8. STANDARD INSTALLATION 7
8.1. Camera Head (CCD head adjustments) 7
8.2. CCU adjustment 7
8.3. Set up points 8
8.4. Customer Set up 9
8.5. Factory set up only 10
9. CCD CAMERA CONNECTORS 11
9.1. CCD camera head connector 11
9.2. Command 12
9.3. Block diagram CCU rack N23 14
10. FUNCTION AND MEMORY CONTROL 15
10.1. Memory function of CCD camera 15
10.2. Recording to and playback from memory modes. 15
10.3. Direct access memory (ADD5=1) 16
10.4. Manual selection mode (ADD5=0, ADD1=1, ADD0=0) 16
10.5. Multiple cine-loop mode without position reset (ADD5=0, ADD1=0, ADD0=1) 17
10.6. Multiple cine-loop mode with position reset (ADD5=0, ADD1=0, ADD0=0) 18
10.7. Erasing memory mode (ADD5=0, ADD1=1, ADD0=0) 18
11. ELECTRICAL DIAGRAMS 18
11.1. General circuit diagram and block diagram of N23 CCD system. 18

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 2/20
1. INTRODUCTION
The CCD camera N23 system acquires and digitizes radiological images.
This equipment must be used in accordance with the manual and is not intended for any use outside of that herein described.
The N23 is a device component and interfaces to x-ray equipment and as such must be used by qualified personnel only with
knowledge of all x-ray protection.
The user is also responsible for all additional compliance certification and correct function at time of installation.
2. SAFETY INSTRUCTIONS
NICAL S.p.A. accepts no responsibility for any misuse of the CCD camera N23 outside of its original design and description as set
forth in manual.
Furthermore NICAL S.p.A accepts no responsibility for any damages to camera, operator, and patient, due to incorrect installation or
unauthorized modification (mechanical or electrical) and misuse of N23 CCD system.
Only personnel authorized by NICAL S.p.A may service equipment.
Authorized persons may only remove covers when servicing electrical power concerns.
It is mandatory to replace parts with only original NICAL S.p.A. replacement components.
2.1. Warnings
1. Read these instructions carefully. Save these instructions for future reference.
2. Follow all warnings and instructions marked on the product.
3. Slots and openings in the cabinet are provided for ventilation; to ensure reliable operation of the product and to protect it
from overheating, these openings must not be blocked or covered.
4. This product should be operated from the type of power indicated on the marking label. If you are not sure of the type of
power available, consult NICAL Company.
5. When the CCD camera is turned on make a white test in according to verify the quality image.
2.2. Environmental risks and disposal
The CCD CAMERA N23 contains some materials that can be recycled at the end of its life cycle.
In particular the system contains the following materials:
 Iron, copper, lead, aluminium, non-biodegradable plastics, and fiber of glass printed circuit boards.
NICAL S.p.A. does not accept equipment for recycling.
2.3. Symbols
Symbol Description
Attention, consult the documentation
DC Direct current
Compliance to Medical Device directive:93/42
Device with type B parts
Protective earth (ground)

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 3/20
50
N
1
50 CCIR 625/50
60
EIA
525/60
N Normal
R
Rotation
A Main analog board only
I Digital + H/V Inversion +
recursive filter
H Digital + H/V Inversion +
DRF(Dynamic recursive filter).
A 0 Frames
1 32 Frames
2256 Frames
4512 Frames
Video 1 Video 2 Video 3 - Video 4
N 525 / 625 --- ---
0 525 / 625 525 / 625 ---
1 525 / 625 525 / 625 525 / 625
2 525 / 625 525 / 625 1049 / 1249
3 625 50Hz
525 60Hz
625 50Hz
525 60Hz
625 100Hz
525 120Hz
Video 1 from main analogic board
Video 2 / 3 / 4: LIH & recursive filter & memory if present
N23 I 0
3. DESCRIPTION
3.1. Identification labels
3.2. Description
CABLE
CAMERA HEAD CABLE
(female DB9)
CABLE
CONTROL + PWR CABLE
(Female DB25)
VIDEO 4 VIDEO 1 VIDEO 2
VIDEO 3
MAIN DIGITAL
BOARD
PROCESSING
BOARD
MEMORY
BOARD
1 2
Made in Italy
Code: N23XXXXXX Type: N23 CCD N23 CCD CAMERA HEAD
Line: 24V DC 20W MANUFACTURER: NICAL SPA
Serial Number: xxxxx Date: 04/03 0123
N
ICAL Spa Via Soffredini, 43 20126 Milano – Italy Serial Number: xxxxx

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 4/20
4. TECHNICAL DATA & CERTIFICATIONS
Available CCD scanning system :
Scanning aspect ratio:
CCIR 625/50 interlaced (752 x 582 pixels)
EIA 525/60 interlaced (768 x 494 pixels)
4:3
CCD Camera Head :
CCD Type:
Integrated optical lens system:
Image intensifier output screen:
Mounting frames:
½” Interline low blooming CCD sensor (470.000 pixels)
High resolution with adjustable focus and diaphragms
From 15 to 40mm diameter.
From 6” inch to 16” inch I.I.
CCD / CCU Characteristics :
Resolution:
Gamma correction:
Video output A/D converter:
Video Bandwidth:
DRF (Dynamic Recursive Filter):
MD (Motion Detection):
Standard Recursive filter:
Memory:
Automatic video level compensation:
Automatic x-ray kV/mA compensation:
Dynamic contrast compensation for better image uniformity:
Very high dynamic video amplifier:
High precision electronic circle:
Video output signal:
20 lines-pairs (on 6” image intensifiers)
0.4 or 1
10 bits
20 MHz ±3dB
Yes (N23H)
Yes (N23)
Factor 2,4,8,16
16 bits
Yes
Yes. Analog and digital (up/down)
Yes (shading)
Yes
Yes
1 Vpp (0.3 Vpp Sync)
Video output standards :
Analog Main board (Video 1):
Digital Main board (Video 2 )
recursive filter and/or DRF & LIH & frame stored:
Digital processing board (Video 3)
(Video 4):
1 BNC 75Ω- ( CCIR 625/50 or EIA 525/60 )
1 BNC 75Ω- ( CCIR 625/50 or EIA 525/60 )
2 BNC 75Ω
CCIR 625/50 interlaced
EIA 525/60 interlaced
CCIR 1249/50 interlaced
EIA 1049/60 interlaced
CCIR 625/100Hz interlaced
EIA 525/120Hz interlaced
Operating conditions :
Working temperature range:
Store temperature range:
Humidity:
-10°C to +45°C
-40°C to +55°C
Operating to 95% relative humidity (non-condensing)
Mechanical specifications :
Control unit: dimension (WxDxH)/ Weight:
Camera head: dimension (φx H)/Weight:
226 x 120 x 46mm 0,550 Kg
(Standard) 85x87mm 0,460 Kg
(with Rotation) 101x87mm 1,1 Kg
Available power supply :
24Vdc ±20%
Approvals :
Safety:
EMC:
Others:
EN 60601-1
EN 60601-1-2
CE-label according 93/42 CEE directive for medical devices.
Options :
360° Continuous rotating camera head (with slip ring)
C-Mount
Zoom lens
Neutral density filter: 25% or 50% light transmission

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 5/20
5. MAINTENANCE AND CLEANING
5.1. Maintenance
The system will serve you well if you take care of it.
 Do not spill liquids on the system.
 Do not subject the system to heavy shock and vibration.
 Never place objects on top of the system to avoid damaging it.
 All electrical equipment should be used according to the instruction provided. It is advised to control all connections and the
image quality on a regular basis. It will guarantee an efficient function and long product life.
Maintenance guide
Frequency Description
2 years Cable connection and condition inspection
1 year Image quality check
5.2. Cleaning
When cleaning the system, follow these steps:
 Power off the system.
 Use a soft cloth moistened with water.
 Do not use liquid or solvents.
6. CCD CAMERA N23 DESCRIPTION
The N23 CCD camera, manufactured using printed circuit board with SMD technology, offers better performance than NICAL’ s
well know N20 camera system. It uses the same camera head of CCD camera N20 and the same wiring and controls. All previously
offered configurations are available in the new system along with vertical-horizontal inversion and continuous 360° rotation. Digital
integrated image processing has been changed from 9 to 10 bit output resolution for better performance. This new system allows
obtaining 512 frames memory with icons and numbered frames displayed. These new characteristics put the new N23 CCD at the top
of the standard resolution CCD cameras for x-ray image intensifier and radiological applications.
A very important new feature available on N23H is DRF (Dynamic Recursive
Filter) which allows changing pixel by pixel the recursive filter factor. This type
of filter offers better photonic noise reduction, eliminating also image
persistence during patient moving.

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 6/20
7. COMPONENT POSITIONS
7.1. POSITIONING OF CAMERA HEAD
Place camera head into output phosphor well of image intensifier (see figure below).
Line up holes at 120’ and fasten with screws to intensifier. If necessary it is possible rotate camera head 90° by 90° with screws at
the bottom of the cover head.
NOTE: For best performance it’s better to insulate the camera head from the ground system. For this reason the camera head has
a special superficial treatment to insulate the head when it is fixed with screws to the system. Be sure to use plastic insulation with
screw to fix head at the system.
7.2. POSITIONING OF CCU
Line up holes at the bottom of the cover CCU and fasten with screws to the system.
NICAL COMPANY DOES NOT PROVIDE THE SET SCREWS
METAL BODY
IMAGE
INTENSIFIER
CCD ADAPTER
SET
SCREW
IMAGE
INTENSIFIER
IMAGE
INTENSIFIER
CCD
ADAPTER
ALUMINIUM
COVER
ALLEN SCREW
CCD
ADAPTER
ADJUSTABLE
DISTANCE RING
RACK CCD N23
BOTTOM
VIEW
5 mm
82 mm
18,7
120 mm
18,7
217 mm

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 7/20
8. STANDARD INSTALLATION
All the CCD cameras are calibrated in Nical Company and the customer may regulate the following functions only:
1. DISTANCE (IMAGE DIMENSION)
2. FOCUS OF THE CCD CAMERA HEAD
3. IRIS OF THE CCD CAMERA HEAD
4. SHADING REGULATION
The parts where it is possible to find these regulations are:
1-2-3 CCD CAMERA HEAD
4 N23_ANB1 BOARD
8.1. Camera Head (CCD head adjustments)
DISTANCE (IMAGE DIMENSION) SET TO REQUIRED PICTURE DIMENSION.
UNLOCK THE ALLEN SCREW, ADJUSTABLE DISTANCE RING AND
ROTATE THE INTERNAL CYLINDER UNTIL THE REQUESTED
DISTANCE.
FOCUS SET FOR BEST FOCUS BETWEEN IMAGE INTENSIFIER AND
CAMERA HEAD
DIAPHRAGM WITH STANDARD DOSE REQUESTED, SET SCREW OF IRIS UNTIL
THE 2 LEDS ON N23_ANB1 TURN OFF. (In these conditions the value of
video signal is equal to 1,3V at test point (TP1)
8.2. CCU adjustment
SHADING MOVE JUMPER J4 (SHADING) ON N23_ANB1 BOARD FROM
POSITION 1-2 (OFF) TO POSITION 2-3 (ON), AND ADJUST P7, P8, P9,
P10 FOR BEST IMAGE UNIFORMITY (using flat x-ray image at standard
dose).
IRIS
1
2
3
4
CD2-BOARD
DRV 61-BOARD
XCD01
FOCUS
ADJUSTABLE
DISTANCE
RING
TP1
ALLEN
SCREW

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 8/20
8.3. Set up points
CODE NAME DESCRIPTION
SW2 AUTO BLK It is used to enable the Black Level Auto Control.
(SW2 ON: position 1-2)
R157 BLACK LEVEL
Ad just black level pedestal (BOTTOM BLACK). When Auto BLK off (SW2
OFF: position 2-3) regulate the pedestal to 30mV respect referring level
R156 BLACK LEVEL
AUTO CONTROL
Ad just black level pedestal (BOTTOM BLACK). When Auto BLK on (SW2 ON:
position 1-2) regulate the pedestal to 30 mV respect referring level.
SW3 AUTO WTH It is used to enable the Auto White Level.
(SW3 ON: position 1-2)
R163 AUTO
WHITE LEVEL
Ad just white level (TOP WHITE). Set to 590mV video analog signal respect
referring level. Use jumper SW3=ON (position 1-2) to select or reject this feature.
R94 GAMMA Factory adjusted
SW4
ANALOG VIDEO (2-3)
/SYNC PULSE PER
SCOPIA PULSATA (1-2)
It is used to enable on Video 1 an analogic signal: (position 2-3) or an output at
25Hz/30Hz square wave (position 1-2) used as sync pulse in high contrast
J6 GAMMA
CORRECTION
Jumper J6 position 1-2: gamma value is 0, 4.
Jumper J6 position 2-3: gamma value is 1
J4 SHADING
ENABLE It is used to enable shading regulations
P7-P8-P9-P10 SHADING
(VS-VP-HS-HP)
Set the shading gain to compensate picture not uniformity because of Image
Intensifier. Use jumper J4=ON (position 2-3) to select or reject this feature
J2 VIDEO & AUTO
CIRCLE ENABLE
It is used to enable the video and auto video regulations
J2 position 3-4: VIDEO CIRCLE; J2 position 2-3 AUTO CIRCLE
P6 VIDEO CIRCLE Adjust circle blanking diameter. Use jumper J2=ON (position 3-4) to select or
reject this feature
P5 AUTO CIRCLE
Adjust measurement circle area used by automatic gain and x-ray KV control.
Use jumper J2=ON (position 2-3) to select or reject this feature
P3 CIRCLE SIMMETRY
Adjust the symmetry of video circle. Use jumper J2=ON (position 3-4) to select or
reject this feature
P1 VERT SHIFT
Adjust the vertical centering of video circle. Use jumper J2=ON (position 3-4) to
select or reject this feature
P2 HOR SHIFT Adjust the horizontal centering of video circle. Use jumper J2=ON (position 3-4)
to select or reject this feature
P4 AUTO KV LEVEL Set the value of AUTO KV
P11 AUTO KV WINDOW
Increase or decrease the sensibility of the automatic KV control. This feature is
very useful in according to adapt the CCD camera N23 for any kind of X-ray
generator
J5
ROTATION RESET
(CCD CAMERA WITH
ROTATION ONLY)
Position 2-3: Automatic reset when system turned -on.
Position 1-2: Manual reset. To bring camera head to 0 position ground pins CW
(pin 17) and CCW (pin 4) on interface connector DB25 at the same time.
Location: N23- MB0.
R94
R157
J5
N23_ANB1
P4
P11
P7P10P9P8P6P5
J4
1 2 3
P1 P2 P3
J2
1 2 3 4
SW4
1 2 3
J6
1 2 3
SW2
1
2
3
R156 R163
SW3
1
2
3
1
2
3

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 9/20
8.4. Customer Set up
SHADING
Using correct dose uniformity, regulate the trimmers P7, P8, P9 e P10 until to obtain on the monitor the maximum uniformity.
The jumper J4 enables or rejects this regulation.
KV AUTO
It is possible to change the answer sensibility of control system dose. In according to change the sensibility, use trimmer P11. The
trimmer P4 changes the action point of the control (video level).
CIRCLE
Using trimmer P6 it is possible to change the diameter of video circle. The trimmer P5 regulates the circle area where it finds the
dose automatic control (ROI). In according to select the video or the auto circle move the jumper J2. The trimmers P1, P2 and P3
regulate the centering and the symmetry.
GAMMA CORRECTION
It is possible change the gamma value. Moving jumper J6 in position 1-2 the gamma level corresponds to 0, 4; while moving jumper
J6 in position 2-3 the gamma level is equal to 1.
VIDEO 1 OUTPUT
On BNC VIDEO 1 are possible changing two signals:
Analogic video 1Vpp 75Ωor a square wave signal 5Vpp at 25Hz/30Hz in according to sync x-ray systems in pulsed fluoroscopy.
To obtain the analogic video move jumper SW4 in position 2-3; while to obtain the square wave signal move jumper SW4 in
position 1-2.
ROTATION
In the systems where the CCD camera head has the rotation:
1. Manual reset. (Factory default). Jumper J5 position 1-2. To bring camera head to 0 position ground pins CW (pin 17) and
CCW (pin 4) on interface connector DB25 at the same time.
2. Automatic reset when system turned on. Jumper J5 position 2-3.
J5
N23_ANB1
P4
P11
P7P10P9P8P6P5
J4
1 2 3
P1 P2 P3
J2
1 2 3 4
SW4
1 2 3
J6
1 2
3
1
2
3

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 10/20
8.5. Factory set up only
VIDEO AUTO LEVEL
The system includes an automatic control of white (WH) and of black (BK).
The trimmer R157 regulates the level of black SET UP when there is not the image. Set up this trimmer in according to obtain a
black-level of 20÷30mV.
The trimmer R156 reduces in automatic way the black-level to compensate the diffusion radiation. Using a phantom which simulates
human body, regulate this trimmer until to obtain a good black-level when it presents diffusion radiation. It is possible reject this
automatic control moving the jumper SW2 (position 1-2: on; position 2-3: OFF).
The trimmer R163 regulates the level of white automatic control (WH). Using a standard phantom and with white automatic control
on regulate this trimmer until to obtain a correct video signal. It is possible reject this control by jumper SW3 (position 2-3) and also
by the command AUTO-OFF (pin 2 25DB connector).
GAMMA
The system is adjustable in according to have a gamma 0, 4. The gamma value can be modified to 1 moving jumper J6. The video
level of gamma correction is adjustable using trimmer R94 and it never must modify other than it necessary to change some
components. In according to make these adjustments apply a video input (CCD camera head) of 3Vpp and regulate this trimmer until
to obtain a value of 0,7Vpp on output VIDEO 1.
R94
R157
N23_ANB1
SW2
1
2
3
R156 R163
SW3
1
2
3

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 11/20
9. CCD CAMERA CONNECTORS
The CCD camera N23 connectors can be divided as follow:
1. CCD CAMERA HEAD CONNECTOR (DB9)
2. COMMANDS INTERFACE CONNECTOR (DB25)
9.1. CCD camera head connector
DESCRIPTION
Command motor 1
Power Supply
Command motor 2
Command rotation
0
Ground video
signal
Video signal
COMMAND
M1
PIN 1
DC
PIN 6
M2
PIN 2
R0
PIN 3
GND
PIN 9
VIDEO
PIN 5
*: ONLY FOR ROTATION
VIDEO
1 2 3 4 5
6
7 8 9
1 2 3 4 5
6
7 8 9
* M1
DC
*M2
*R0
FEMALE
(SOLDERING VIEW)

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 12/20
9.2. Command
ROT-ORA
CW
+24V
AUTO-OFF
-KV
ROT-ANT
CCW
LIH
X0 FILTER
X8 FILTER
INVH
HORIZONTAL INV.
FREEZE-A
MWR
ADD1
ADD3
GND
ADD5
+KV
CCD N23H: DRF
CCD N23: MD
X16 FILTER
INVV
VERTICAL INV
ADD2
1
2
3
4
5
6
7
8
10
11
9
12
13
14
15
16
17
18
19
20
21
23
24
22
25
CONTROL
X4 FILTER
FREEZE-B
ADD0
ADD4

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 13/20
NAME SIGNAL PIN DESCRIPTION
+24V IN 1
POWER SUPPLY: 20÷30 V
GND IN 14
GROUND REF.
AUTO-OFF IN 2
AUTOMATIC WHITE LEVEL.
OPEN: ON
GND: OFF
-KV OUT 3
OUT= +18V IF DOSE IS TOO LOW.
OUT= 0V IF DOSE IS CORRECT OR TOO HIGH.
+KV OUT 15
OUT= +18V IF DOSE IS TOO HIGH.
OUT= 0V IF DOSE IS CORRECT OR TOO LOW.
CONTROL OUT 16
ANALOG KV CONTROLL. OUT= 0÷12 V.
OUT = 0V IF DOSE IS TOO LOW.
OUT = 12V IF DOSE IS TOO HIGH.
OUT = 6V IF DOSE IS BALANCED.
ROT-ORA
CW IN 17
GND: CLOCK WISE ROTATION. IF GND AT THE SAME
TIME WITH PIN 4 (ROT-ANT) RESET TO 0° ANGLE.
ROT-ANT
CCW IN 4
GND: ANTI CLOCK WISE ROTATION. IF GND AT THE
SAME TIME WITH PIN 11 (ROT-ORA) RESET TO 0°
ANGLE
LIH IN 5
OPEN: LIVE IMAGE
GND: LAST IMAGE OLD
DRF
CCD N23H IN 18
OPEN: DYNAMIC RECURSIVE FILTER
GND: STANDARD RECURSIVE FILTER
MD
CCD N23 IN 18
OPEN: MOTION DETECTION
GND: STANDARD RECURSIVE FILTER
X0, X4, X8, X16 ALL HIGH
LEVEL NOISE FILTER = 2
X0 IN 6
GND: NOISE FILTER = 0
X4 IN 19
GND: NOISE FILTER = 4
X8 IN 7
GND: NOISE FILTER = 8
X16 IN 20
GND: NOISE FILTER = 16
INVH
HOR. INV. IN 8
OPEN: REAL IMAGE
GND: HORIZONTAL IMAGE INVERSION
INVV
VERT. INV. IN 21
OPEN: REAL IMAGE
GND: VERTICAL IMAGE INVERSION
FREEZE-A IN 9
OPEN: LIVE IMAGE
GND: FREEZE THE IMAGE IN VIDEO 3
FREEZE-B IN 22
OPEN: LIVE IMAGE
GND: FREEZE THE IMAGE IN VIDEO 3
MWR IN 10
SEE MEMORY OPERATION
ADD0 IN 23
SEE MEMORY OPERATION
ADD1 IN 11
SEE MEMORY OPERATION
ADD2 IN 24
SEE MEMORY OPERATION
ADD3 IN 12
SEE MEMORY OPERATION
ADD4 IN 25
SEE MEMORY OPERATION
ADD5 IN 13
SEE MEMORY OPERATION

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 14/20
9.3. Block diagram CCU rack N23
RECURSIVE FILTER
INVERSION H/V
LIH
ANALOG OUTPUT
VIDEO 1
STANDARD
CONVERSION
FREEZE A/B
MEMORY
STORE
DIGITAL BOARD N23_DIB1
CONVERSION BOARD N23_CON0 MEMORY BOARD N23_MEM1
ADD0 (Pin 23)
ADD1 (Pin 11)
ADD2 (Pin 24)
ADD3 (Pin 12)
ADD4 (Pin 25)
ADD5 (Pin 13)
MWR (Pin 10)
FREEZE A (Pin 9)
FREEZE B (Pin 22)
D/A 10 BITS
VIDEO 3 (A) VIDEO 4 (B)
VIDEO 2
+24V (Pin 1)
GND (Pin 14)
AUTO-OFF (Pin 2)
CW (Pin 17)
POWER SUPPLY
VIDEO PROCESS
CIRCLE GENERATION
AUTO LEVEL BW/WH
AUTO KV
SHADING
ROTATION DRIVE
VIDEO SIGNAL
FROM CCD HEAD
ANALOG BOARD N23_ANB1
-KV (Pin 3)
+KV (Pin 15)
CONTROL (Pin 16)
CCW (Pin 4)
A/D 10 BITS
D/A 10 BITS
X0 (Pin 6)
X4 (Pin 19)
X8 (Pin 7)
X16 (Pin 20)
CCD N23H: DRF (Pin 18)
LIH (Pin 5)
HOR. INV. (Pin 8)
VERT. INV (Pin 21)
CCD N23: MD (Pin 18)

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 15/20
10. FUNCTION AND MEMORY CONTROL
10.1. Memory function of CCD camera
The pins used for memory function are the following 10;
LIH, FREEZE_A, FREEZE_B, MWR, ADD0, ADD1, ADD2, ADD3, ADD4, ADD5.
There are 5 memory modes listed below.
• Direct access mode. Allows the recording or display of the first 32 positions of memory.
• Manual selection mode. Allows the user to move indicator to desired position to guarantee recording/playback at a specific
position.
• Multiple Cine-Loop mode without reset. Allows the recording/ playback of images in sequential order at a selected speed
starting from actual indicator position.
• Single Cine-Loop Mode with reset. Allows the recording/playback of images in sequential order at a selected speed starting
from initial (first) indicator position.
• Erasing Memory. Allows the erasing of the full memory.
10.2. Recording to and playback from memory modes.
The MWR write/read command signal manages the memory storage operations described as follow:
ATTENTION: 0 = GROUND 1 = OPEN
MWR DESCRIPTION
0
Memory Write. If MWR= GND user can record an image to the memory. The video input (Live or LIH)
present on BUS is transferred to the memory at the position where indicator is found and with selected mode.
(See list of modes.)
1
Memory Read. If MWR= OPEN (1) user can playback an image from the memory. The frame displayed will
correspond to indicator position at this time. The frame will be transferred to BUS with selected mode. (See
list of modes.)
Monitor visualization (APPLICATIONS):
MWR FREEZE A FREEZE B LIH DESCRIPTION
0 X X 1
Write memory with the image present on BUS (LIVE), for all the setting-value
of the other 3 commands.
1 X X 1 LIVE (images from camera head)
Memory stand-by.
1 1 X 0 Read memory frames and images are transferred on monitor A
1 X 1 0 Read memory frames and images are transferred on monitor B
1 1 1 0 Read memory frames and images are transferred on both monitor A and B
X 0 X X FREEZE A. Image on monitor A frozen.
X X 0 X FREEZE B. Image on monitor B frozen.

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 16/20
10.3. Direct access memory (ADD5=1)
ADD5 ADD4 ADD3 ADD2 ADD1 ADD0 DESCRIPTION
1
1 1 1 1 1
If MWR=0 the image on the BUS (Live or LIH) is recorded
at the first position.
If MWR =1 the recorded image is read at position 1 and
transferred to BUS for display
1
1 1 1 1 0
Same as above record/read memory at position 2
1
1 1 1 0 1
Same as above record/read memory at position 3
1
1 1 1 0 0
Same as above record/read memory at position 4
1
1 1 0 1 1
Same as above record/read memory at position 5
1
1 1 0 1 0
Same as above record/read memory at position 6
1
- - - - -
Same as above record/read memory for the others position
1
0 0 0 0 0
Same as above record/read memory at position 32
10.4. Manual selection mode (ADD5=0, ADD1=1, ADD0=0)
ADD5 ADD4 ADD3 ADD2 ADD1 ADD0 DESCRIPTION
0
RESET 0=DWN
1=UP
CLK
1 0
MANUAL UP OR DOWN MODE
0
1 1
CLK
10
(UP) The indicator of frame memory position is moved to
the next successive position. (position ⇐position+1)
0
1 0
CLK 10
(DOWN) The indicator of frame memory position is
moved to preceding frame in memory. ( position ⇐
position-1)
0
CLK
X X
10
(RESET) The indicator of frame memory position is
moved to initial frame of stored image sequence.
(position = 1)

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 17/20
10.5. Multiple cine-loop mode without position reset (ADD5=0, ADD1=0, ADD0=1)
ADD5 ADD4 ADD3 ADD2 ADD1 ADD0 DESCRIPTION
0
X X X 0 1
MULTIPLE CINE-LOOP MODE WITHOUT
RESET
In this mode the record/playback starts from the actual
position found. (MWR) increasing frame by frame
automatically at the selected speed rate. In this mode it is
possible to acquire a series of different segmented images
at various times. During a successive playback of all the
images in the memory it is possible to read the different
phases of an exam recorded at different times.
0
1 1 1 01
Speed 25 (30) Frames per second
When MWR=0 images are acquired into the memory at
25 (30) fps. Starts at actual position of indicator.
When MWR=1 images are read (playback) from memory
at 25 (30) fps. Starts at actual position of indicator.
0 1 1 0 01Speed12 (15)fps
0 1 0 1 01Speed 6 fps
0 1 0 0 01Speed 3 fps
0 0 1 1 01Speed 1 fps
0 0 1 0 01Speed 0.5 fps
0 0 0 1 01Speed 0.25 fps
0
0 0 0 01
Single Shot
When MWR=0 the user acquires ONE image into
memory at the actual position of indicator.
When MWR=1 the user can read ONE image from the
memory at the actual position of indicator.
In both cases the frame number is automatically increased
to the next position after the recording or the playback of
an image

NICAL Spa CCD CAMERA N23 Service Manual Release 1 Page 18/20
10.6. Multiple cine-loop mode with position reset (ADD5=0, ADD1=0, ADD0=0)
ADD5 ADD4 ADD3 ADD2 ADD1 ADD0 DESCRIPTION
0
X X X
0 0
MULTIPLE CINE-LOOP MODE WITH
RESET
During this mode the recording or playback always starts
at the first position (position = 1) regardless of the
position of the frame number indicator at MWR. The
frame memory number position increases automatically at
the selected frame rate speed.
0
1 1 1
00
Speed 25 (30) Frames per second
When MWR=0 images are acquired into the memory at
25 (30) fps starting at position =1.
When MWR=1 images are read at 25 (30) fps starting at
position=1.
0 1 1 0
00Speed12 (15)fps
0 1 0 1
00Speed 6 fps
0 1 0 0
00Speed 3 fps
0 0 1 1
00Speed 1 fps
0 0 1 0
00Speed 0.5 fps
0 0 0 1
00Speed 0.25 fps
0
0 0 0
00
Single Shot
When MWR=0 The memory acquires ONE image only
starting at position = 1
When MWR=1 only ONE image is read from the
memory at position=1.
In both cases the memory increases automatically frame
by frame during recording or playback.
10.7. Erasing memory mode (ADD5=0, ADD1=1, ADD0=0)
ADD5 ADD4 ADD3 ADD2 ADD1 ADD0 DESCRIPTION
0 X X X 1 1ERASING MEMORY
0
0 0 0
11
Full erasing memory if signals contemporary GND more
than 1,5 sec.
11. ELECTRICAL DIAGRAMS
11.1. General circuit diagram and block diagram of N23 CCD system.
Boards Description
N23_MB0 Mother board N23
N23_ANB1 Video board diagram, Auto KV, electronic circle generator and camera head rotation
N23_DIB1 Digital board diagram, A/D converter, LIH, sweep reversal, recursive filter and DRF.
N23_CON0 Conversion board diagram, standard video and inversion
N23_MEM1 Memory frames diagram
NCD_XCD01 CCD sensor block
NCD_XCD02 Power supply board CCD head