Logitek ULTRA-VU NBC896 Installation and operating instructions

Logitek Software License Agreement
The Ultra-VU unit you have purchased contains embedded software.
The software is owned by Logitek Electronic Systems, lnc. and is pro-
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Logitek grants to you the right to use one copy of the embedded soft-
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software. You may not reverse engineer, decompile, disassemble, or
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ment.
LOGITEK ELECTRONIC SYSTEMS, INC.
5622 EDGEMCOR DRIVE
HOUSTON,TX 77081
All information contained herein is confidential. No portions of this man-
ual may be reproduced by any means without written permission from
Logitek Electronic Systems, lnc.
COPYRIGHT 1996, LOGITEK ELECTRONIC SYSTEMS, INC.
&- itgkErecrronic systems, rnc
a&20-BEfffireFBn+tfE-r HOUSTON, TXJZO5J-USA u 800-231-5870 (OUTSIDE USA & CANADA 7+#2) nFAX+8,.728+647

ULTRA.VU NBC896 & NBC996
OPERATION & SERVICE MANUAL
TABLE OF CONTENTS
SECTION 1- GENERAL INFORMATION
1 1 9.eneral Descriplion
1-2 Electrical Specifications
1-3 Standards
1-4 lnstrument ldentification
J
.)
J
1-5 WheretoFindHelP.. .......3
SECTION 2 _ PREPARATION FOR USE
2-1 lnitial lnspection... .........4
2-2 Claims...... .......4
2-3 RepackingforShipment.... .......4
2-4 lnstallatioi ...'4
2-5 Connecting Mains Power. . . . .4
2-6 Connectin[Audiolnputs .....4
2-7 Alarm Svsiem (UV2-'RD-NBCB96 only). . . . . .4
2-B RearPahel Prcigramming Switches .........4
SECTION 3 _ OPERATING INSTRUCTIONS
3-1 BarqraphDescription ...'....6
3-2 VUDisplay ....6
3-3 PPMDisolav.... ....6
3-4 PeakHolddisplay ....6
3-5 LouD-LoudnessFilter. ....6
3-6 l-S-lmaqe/SumDisplay.... ......6
3-7 FINE-HighResolutibn-Mode ......7
3-8 AuxiliaryDiteDisplay.... ....."..7
3-9 ChangingDisplay'Brightness. .......7
3-10 CllPindicatoiseitpoint '.....7
3-11 BesettingtheProgram .......7
SECTION 4 - MAINTENANCE
4-1 General Information .....'...8
4-2 Fuse.. ..."..8
4-g Handlinqof CMOS lntegratedCircuits. '.... 'B
4-4 AcCessioCircuitCards". ...'.8
4-5 PowerSupolv LG-253. .'....8
4-6 Dual DioithUAlarmCardLG-257a... ......'B
4-7 DisplayassemblyLG-267 .........9
SECTION 5 - REPLACEMENT PARTS LIST
S-t PowerSupplyLG-253. ..'..10
5-2 Dual Digital/Alarm Card LG-257a ' . . 10
5-3 DisplayAssemblyLG-267 ........11
SECTION 6 - MANUFACTURERS LIST
SECTION 7 - DIAGRAMS

SECTION 1- GENERAL INFORMATION
1-1 General Description
The Logitek Ultra-VU is a bargraph type audio me-
ter featuring two tri-color LED bargraphs with clip in-
dicators. Two function buttons and several auxiliary
data indicators are also included on the f ront panel.
1-2 Electrical Specif ications
Bargraphs per meter:
lndicators per bargraph:
Normal Range: -70 dB to 0 dB plus clip - digital
-50 dB to + 20 dB Plus cliP - analog
Fine Range: .2 dB per segment around ref pt.
Reference Point: -10,-12,-14,-16,-18 or -20 dB
Peak Markers:8,9,10,12,14,16,18 dB above ref pt
Ballistics:
VU Mode 300 mS/20d8 attack & release
PPM Mode 0 mS attack,2.8Sl24dB release
Peak Hold 0 mS attack, 2 or 5 Second hold
Max Hold 0 mS attack, pushbutton release
lmage/Phase 4 Sec hold on max image
Clip lndicator: trigger on 1 or 4 consecutive
clipped samples
Frequency Response:
Normal +/-.1 dB 20 Hz - 20 KHz
Loudness Filter 58 dBSPL auditory curve
-40 dB 20 Hz,0 dB 1 250 Hz, -50 dB 20 KHz
Brightness control:
Digital lnput:
Formats
lmpedance
Termination
AC Line lnput Voltage:
50-60 Hz
(switch settable)
Power Requirement:
Dimensions:
8 levels
AES/EBU or S/PDIF
75 Ohm (BNC)
transformer balanced
105-129 VAC or
220-240 V AC
20 Watts
19"Wx7"Dx1314"H
1-3 Standards
The Ultra-VU meters are designed to conform to
the ballistic standards described in IEEE document
G.2.1.2113, IEC document 268 and EBU document
3205-E. This ensures that the bargraph motion will
closely track other standard mechanical and elec-
tronic meters.
Page 3
Manual **
The one exception to these standards is the PPM
attack time. The Ultra-VU uses a true peak measure-
ment scheme that always displays the highest peak
of the input signal. The PPM standard specifies a
short averaging period for peak signals that keeps
sounds with durations too short to be heard well f rom
being displayed, no matter how Ioud they are. The
delay also allows mechanical meters to keep up with
fast changing inputs. Under most circumstances
there is no noticeable difference between true peak
and PPM peak readings. However, if you do need the
Ultra-VU to conform to the PPM peak standard then
please co ntact the Log itek f actory f o r f u rther inf o rma-
tion.
1-4 lnstrument ldenti{ication
The Ultra-VU is identif ied by a model number and
a three or four digit serial number. The model number
and serial number appear on a label on the back of
the unit near the power cord. All correspondence to
your Logitek dealer or to the Logitek factory should
refer to the model number and serial number.
1-5 Where to Find Help
Logitek customer service personnel are available
to help with any questions, comments or problems
you might have with the Ultra-VU meter, both during
and after the warranty period. Our hours of operation
are BAM to 5PM centraltime. We may be contacted in
one of the following ways.
By Phone: [phone] (USA & Canada)
By Fax:
By Email:
"-.ar-Z-tr-3-4.&H592
213-282-V+97
@
By Mail: Logitek Electronic Systems, lnc.
-3320-BetingrDrtve
ttplstoo*e*ffi
Two
63
** Ultra-VU NBCB96 & NBC996 Operation & Service

SECTION 2 - PREPARATION FOR USE
2-1 lnitial lnsoection
Check the shipping carton carefully for external
damage. lf the carton shows evidence of abuse, ask
the carrier's agent to be present when the unit is un-
packed. Caref ully unpack the unit to avoid damaging
the equipment through the use of careless proce-
dures. Inspect all equipment for damages immedi-
ately after unpacking. Bent and broken parts, dents
and scratches should be noted. If damage is found,
ref er to paragraph 2-2tor recommended claim proce-
dures. Keep all packing material for possible future
USE.
2-2 Claims
lf the unit has been damaged, notify the carrier im-
mediately. File a claim with the carrier and advise Lo-
gitek of such action to arrange for repair or
replacement without waiting for a claim to be settled
with the carrier.
2-3 Fepacking for Shipment
lf the unit must be returned to Logitek, attach a let-
ter to it showing the owner's name and address. A de-
scription of necessary service should be included in
the letter. The original shipping carton and packag-
ing materials should be used for reshipment if possi-
ble. Use FRAGILE labels on each surface. Return
the unit f reight prepaid. Be sure to insure the unit for
its full value. The unit will be repaired promptly and
returned f reight prepaid.
2-4 lnstallation
The Ultra-VU rackmount models are designed to
be mounted in a standard 19" equipment rack by us-
ing the four mounting holes in the corners of the f ront
panel. Plastic washers should be used to keep the
mounting screw for marring the front panel finish.
2-5 Connectino Mains Power
Connect the meter to the power mains with the en-
closed power cord. The unit is factory set for 1 1SVAC
operation unless specifically labeled otherwise, but
230VAC operation can be selected via a slide switch
located next to the power transformer inside the unit.
To gain access to the voltage select switch, remove
the enclosure top cover. The switch is located adja-
cent to the large power transformer.
2-6 Connectino Audio lnouts
The Ultra-VU accepts two inputs per meter via75
ohm female BNC connectors on the rear panel. The
input format is AES/EBU or S/PDIF serial data at
sample rates of 30,000 to 50,000 samples per sec-
ond.
** Ultra-VU NBC896 & NBC996 Operation & Service Manual**
Page 4
Normally the A input is displayed on the meter and
checked for errors by the alarm section. To check
and display lhe B input connect the switch 1 terminal
to the switch common terminal on the rear panel ter-
minal block. Note that the switch inputs are surge
protected but not ground isolated and should be kept
within 5 volts of the enclosure.
2-7 Alarm System (UV2-RD-NBC896 only)
Three elements of the active input are constantly
checked for errors. A dry contact relay closure is acti-
vated if an overmodulation, undermodulation or
phase reversal problem is detected. The relay con-
tacts are accessed via a rear panel terminal block.
Also, a front panel indicator will light if any alarm is
active.
Trip points for over and under modulation are pro-
vided as well as variable delay times before an alarm
is activated.
The phase display triggers if the left-to-right phase
relationship is more than2l3 out of phase and is not
adjustable.
Normally an alarm will reset as soon as the error
causing it stops. However, the alarms will latch on
and not reset if jumper P8 is removed. P8 is located
on the control card nerar the center. lt is accessed by
removing the meter top cover. When in latching
mode is active, an alarm will remain active until the
switch 2 input on the rear panel terminal block is con-
nected to the switch common pin.
2-B Rear Panel Programming Switches
A block of eight mode setting switches is located
on the rear panel of the meter to the right of the input
BNC connectors. The switches are numbered 1
through 8 and are set by pushing the white levers up
or down with a small screwdriver or pen point.
The orange bargraph zero re{erence marker and
the reference level of the f ine display is set via switch
B as shown.
Zero Reference Settrng
Sw8 dBs below full scale
Up -18 dB
Dn -20 dB
An alarm will be activated when the average signal
level of either channel exceeds the overmod trip
point at least once every 5 mSec during the entire
alarm delay period. The trip point and delay time is
set via the programming switches and the alarm is
output on relay 1.

Sw1 Sw2
UP .UP
Up tDn
Dn Up
Dn Dn
Overmod Alarm Trip Point
dBs below full scale
-1 7 dB (+3 dB above -20 dBFS)
,-14 dB (+6 dB above -20 dBFS)
r-11 dB (+9 QB above -20 dBFS)
-g Og (+12 dB above -20 dBFS)
l
Sw3
Up
Up
Dn
Dn
Overmod Alarm Delay
Sw4 delay before alarm activatgs
Up 30 seconds
,Dn :60 seconds
Up .120 99qo1ds
,Djr:J 80 secq4$
An alarm will be activated when the average signal
level of either channel remains under the undermod
setpoint for the entire alarm delay period.The trip
point and delay time is set via the programming
switches and the alarm is output on relay 2.
Undermod Alarm Trip Point
Sw6 dBs below fu!! scale
Up ,-35 dB (- !!belorat2O qqFS)
Dn ]-+o og (-20 below -20 dBFS) I
lUp -50 dB (-.3Q beloUfr2O dEFS)
Dn -60 dB (-40 belory -20 9IBFS)--- :!l
Undermod & Phase Alarm Delay
Sw7 delay before alarm activates
Up 120 Seconds
Dn ,240 Seconds
. The programming switches are only checked oc-
casionally, so it may take up to two seconds for
switch changes to be reflected in the meter's opera-
tion.
Page 5
ManLtal **
Sw5
Up
Up
Dn
Dn
** lJltra-VU NBCB96 & NBC996 Operation & Seruice

SECTION 3 - OPERATING INSTRUCTIONS
3-1 BargraphDescription
The Ultra-VU display contains two multi-LED bar-
graph displays mounted one above the other. The
top bar shows either left channel (L) or im -
age/phase($) information. The bottom bar shows ei-
ther right channel (R) or mono sum (S) information.
The bars are marked at the left end to indicate their
function. The tri-color LEDs can be green, red or or-
ange depending on their function and cover the
range f rom -70 dBFS to 0 dBFS.
The top LED of each bar is larger and red only. It is
used as a clipping indicator and can be set to illumi-
nate on any clipped signal or only after four consecu-
tive clipped samples.
The zero reference point of the meter is indicated
by a dim orange marker in the bargraph. The refer-
ence mark can be varied between -18 and -20 dBFS
via a switch on the back panel.
The meter has two stereo inputs. Normally the A
input is displayed. lf the B input is being displayed a
light next to the 'B lN" legend will light. The meters
may also have error detection software installed. lf a
problem is detected a light next to the "ALARM" Ieg-
end will light.
3-2 VU Display
VU is indicated by a solid green bar below 0 VU
and a solid red bar above 0 VU. VU represents the
perceived loudness of the input signal. The motion of
the bars conforms to the industry standard 300 mSec
per 20 dB rise and fall times. Note that the speed of
the bar will appear faster near the top of the meter
display because each segment there represents
fewer dBs than at the bottom of the meter. The VU
display can be turned off by pressing the MODE but-
ton at the bottom left corner of the f ront panel repeat-
edly until the VU bars disappear.
3-3 PPM Display
Peak program meter (PPM) information is shown
by a single red segment. PPM represents the highest
point of the input signal. The display has a zero rise
time and an industry standard 2.8 Sec per 24 dB fall
time. The dot will appear to fall faster near the top of
the meter range because each segment there repre-
sents fewer dBs than at the bottom of the meter. The
PPM display is always active unless it is turned off by
the programming switches on the back panel.
The VU and PPM displays are calibrated so that
they will read the same when connected to sine wave
signals. The red PPM dot will be on top of the highest
green segment of the VU bar resulting in a bright or-
ange dot. For dynamic signals the difference be-
tween the top of the VU bar the the PPM dot is
approximately the crest factor.
** Ultra-VIJ NBC896 & NBC996 Operation & Seruice Manual**
Page 6
3-4 Peak Hold Disolav
The peak hold display is a single red segment that
maintains the highest PPM reading for a user se-
lectable amount of time. lf the holding period expires
before the PPM dot equals or exceeds the peak hold
dot, then the peak hold dot will turn off . lt will turn on
again when the PPM dot reaches a peak and starts
falling again.
Two holding modes are available. Release (Rel)
mode holds the peak reading for 2 seconds. Maxi-
mum (Max) mode holds the highest peak reading un-
til it is manually reset by turning the peak hold off and
then on again.
Peak hold can be cycled through Off , Rel and Max
modes by repeatedly pressing the HOLD button at
the lower right corner of the meter f ront panel.
3-5 LOUD - Loudness Filter
The VU display can be compensated to match the
f requency response of the human ear by enabling the
loudness filter. This will cause the VU bars to more
closely represent the actual loudness perceived by
the listener and allow better level matching between
different kinds of program material.
The loudness f ilter is calibrated for a listening level
of 58 dB SPL. The f ilter will be less accurate for listen-
ing levels above and below this point.
To activatethe f ilter, press the MODE button in the
lower left corner of the meter front panel until the
"Loud" indicator is lit.
Users of the digital input meters should note that
filtering is a f unction of sample rate. The meler has a
separate filter for each of the five sample rates listed
on the front panel. lf a non listed sample rate is used
the loudness filter will be deactivated.
3-6 l-S - lmage/Sum Disptay
The image and sum displays are activated by
pressing the MODE button in the lower left corner of
the meter front panel until the "$" indicator if lit.
ln this mode, the lower bargraph displays the
mono sum of the left and right input channels. The
display operates identically to the left and right bar-
graphs except that the loudness f ilter is not available.
The upper bargraph shows the stereo image and
relative phase information. Three orange markers
are located at 90 degrees left, 0 degrees cenler and
90 degrees right. The scale covers 180 degrees
which is the largest relative phase difference two sig-
nal can have.
The red dot indicates the current location of the left
channel in the stereo sound f ield and the green dot in-
dicates the current location of the right channel in the

stereo sound field. The overall width and location of
the stereo image is shown by a second pair of red and
green segments that hold the furthest left and right
readings for about four seconds.
lf a mono signal is being displayed, then the red
and green segments will be at the same location re-
sulting in a dot that looks orange. lf the mono signal
is ofi center (such as left channel only), the resulting
orange dot will be off to one side of the display.
3-7 FINE - High Resolution Mode
Fine is a high resolution mode that expands the
meter scale to .2 dB per segment around the 0 VU
point. This mode is useful when doing precise align-
ments using steady state signals. Fine is activated by
pressing the MODE button at the bottom left of the
meter f ront panel until the FINE indicator lights..
3-B Auxiliary Date Display
Ultra-VU models with serial digital inputs provide
information about the input data format via indicator
lights along the bottom of the meter f ront panel. This
information is for the active channel only.
EMPH Indicates pre-emphasis has been applied
to the audio and is recovered from the embedded
channel status data. The circle is lit only when em-
phasis is detected. The indicator is accurate with
both AES/EBU and S/PDIF input formats.
PRO indicates whether the data stream is in the
professional or consumer format and is recovered
irom the embedded channel status data. The circle is
lit only when the AES/EBU professionalformat is de-
tected.
3-9 Changing Display Brightness
The overall illumination level of the meter can be
set to one of eight levels. To change the brightness
level, press the MODE button untilthe BRT indicator
lights. Then press the HOLD button until the desired
illumination level is achieved.
3-10 CLIP indicator set point
The large red clip segment at the top of each bar-
graph can be set to light on the reception of either one
or four clipped samples in a row. To change the set-
ting press the MODE button until the CLIP indicator
alohg the bottom of the meter lights. A segment in the
lower bargraph will start to blink alternately red and
green to indicate the current setting. Press the HOLD
button until the desired setting is shown on the bar-
graph.
3-11 Resetting the Program
The Ultra-VU contains software that executes on a
programmable DSP chip. lf the processor memory
Page 7
Manual *"
becomes corrupted, the meter will probably fail to
operate. ln most cases, an independent watchdog
circuit will notice that the meter is working incorrectly
and restart the system.
The processor can be reset manually by turning
the power off and then back on again.
.* Ultra-VtJ NBC896 & NBC996 Operation & Service

SECTION 4 - MAINTENANCE
4-1 General lnformation
The UItra-VU is designed to need a minimum of
maintenance for long trouble-free operation. Should
repair be necessary, the technician should first read
the information in the manualconcerning the circuits
in question and should follow proper procedures for
testing and replacing semiconductors. Logitek engi-
neers are readily available at the factory to provide
technical assistance both during and after the war-
ranty period.
* * * * * * * * * * WARNING * * * * * * * * * * *
The inside of the Ultra-VU contains no controls or
user serviceable parts. The cover should only be re-
moved by competent technical personnel capable of
servicing this type of equipment. Hazardous voltages
: :'i : i t: : i1t :': : ",- ".t ." ".i"."1':'jt." 1':'. . . .
4-2 Fuse
The primary winding of the power transformer is
f used with a 112 amp slow-blow 20mm f use housed in
a fuse holder in a slide-out drawer under the power
cord on the rear panel of the unit. lt should only be re-
placed with f uses of the same type and current rating.
The power cord must be unplugged from the rear
panel to gain access to the fuse holder.
* * * * * * * * * * WARNING * * * * * * * * * * *
Do NOf replace the fuse without f irst disconnect-
ing the meter's power cord from the wall socket, as
dangerous voltages are present which may cause
electrical shock. Always use f uses of the same value
and type as specified in this manual. Do NOf use
f uses of a higher value than those specrf ied, as shock
:1':':::i'l:if i': I:'.;":'l'. * * * * * * * *
A blown fuse is most often, although not always, a
symptom of another failure. Related circuitry should
always be carefully examined after any fuse failure,
especially if a replacement fuse also blows.
4-3 Handling of CMOS lntegrated Circuits
All logic components in the Ultra-VU meter are
CMOS type integrated circuits. Even though all cir-
cuits have built in static discharge protection, special
care must be taken in the handling of these devices,
particularly in dry environments.
* * * * * * * * - IMPORTANT* * * * * * * * * *
Do NOf remove or handle CMOS integrated cir-
cuits except in a grounded environment which is f ree
of the risk of static electricity. Store such circuits on
conductive foam or in anti-static controllers. Do NOf
store on styrofoam or other plastic sheets. lmproper
handling may damage these devices.
** Ultra-VU NBC896 & NBC996 Operation & Seruice Manual *r
Page B
;;.;;"..;-,..;,;.* * * * ,, * * * * * * *
Access to the circuitry of the rackmount meters is
accomplished by removing the eight screws that at-
tach the top cover.
4-5 Power Supply LG-253
Each Ultra-VU contains a ground isolated and fil-
tered step-down power supply to create the neces-
sary operating voltages. This supply is located on a
PCB on the right side of the meter enclosure.
Mains AC from the power entry module J2 is fed
through f use F1 , located in a drawer under the power
cord in J2, to J1 on supply card LG-253. J1 feeds volt-
age selection switch S1 which connects the dual pri-
maries of transformer T1 in series for 230VAC
operation or parallel for 1 15VAC operation. The dual
secondaries of T1 are wired in parallel and loaded
with a full-wave bridge rectifier RT1. The DC output
of RT1 is filtered by capacitors C1 and C2 and fed to
the red and green output pads. The voltage should be
between 8 to '10 VDC with less than .5 volt of ripple.
Analog input models will also have a charge pump
conslsting of lC1 and C3 that feeds filter C4 and the
black output pads. The voltage should be -B to -10
VDC with less than .1 volt of ripple.
Jumpers soldered to the output pads feed power
to one or two meter control cards.
* * * * * * * * * * WARNING * * * * * * * * * * *
Dangerous voltages are present on the bottom of
the power supply card. Always disconnect the AC
: 11" :'."1'* i i" : : "J "j "l T i 1''. "j': 1' : : i' I * * *
4-6 Dual Digital/Alarm Card LG-257a
Power from input connector P5 is connected to
voltage regulators lC3 and lC4 as well as display
board connectors P6 and P7. lC3 is a +SVDC regula-
tor that f eeds power to the analog f ront end of data re-
ceivers lC1 and lC2. The voltage is f iltered by C5- C9
and clamped against over voltage and voltage rever-
sal by D2. lC4 is a +SVDC regulator that feeds the
digital portion of lC1 and lC2 and all other circuits on
the control board. The output voltage !s filtered by
C10 and clamped by D3. Distributed powerf iltering is
supplied by C1 1-14^
On power up, the DSP is kept in reset by lC6 until
the power has stabilized, ensuring a good power on
reset. lC6 also contains a watchdog timer that will re-
set the DSP if its ST pin in not taken low at least once
every 150 mSec. This pin is normally pulsed low
every 5 mSec by the left bargraph load signal.
The DSP (lCB) is clocked by a12.2BB MHz crystal
oscillator consisting of Y1,C'15,C16 and an internal

driver. lC8, pin 43 is a buffered output of the oscilla-
tor.
The first thing the DSP (lCB) does after reset is
copy its program from EPROM lC7 to internal RAM
memory. That program executes continuously. Note
that the 8 bit data bus is connected to the middle byte
of the DSP's 24 bit data port.
The rear panel DIP switch S1-8 and the f ront panel
rocker switches S11 and S12 are connected to the
DSP data port via pull-up resistors R1, R2 and isola-
tion resistors R10, R11.
Serial data is sent synchronously (data, clock,
load) to the display driver chips via the left/right dis-
play conneclor P7 and image/sum display connector
P6 in 16 bit strings. Data is placed on the top bit of the
DSP data port and clocked into the display drivers via
a write to address decoder lC9. Other writes to lC9
will load the 16 bit data string into one of the display
drivers on the display board. A write to the left bar-
graph will also be decoded by lC9 and used to reset
the watchdog timer.
Two channel audio data is fed synchronously
(data, clock, frame sync) from data receiver lC1 to
DSP (lCB) serial port 1.
Encoded audio data enters the meter via BNC
conneclorJ'1, passes through ferrite beads FR1,FR2
and connects to pulse transformer T1 via DC block-
ing capacitorCl. The output of T'l is loaded by R5,R3
and connected to data receiver lC1. C3 and R7 form
a loop filter used by lC1 to recover the embedded
clock from the coded input signal. lCl separates the
audio data, channel data and clock from the input
data. The audio is sent to the DSP in 64 bit strings via
a serial port. Channel subcode data and the PLL lock
flag are connected to the DSP data bus via isolation
resistors R1'1.
The second input is handled in an identicalfashion
by lC2 and is connected to serial port 0 of the DSP.
Four bits of the data bus are stored in quad f lip-f lop
lC5 by a write to address decoder lC9. The outputs of
lC5 drive up to three SPST relays. The relay switch
contacts are sent to the rear panel alarm connector
via P3.
4-7 Display Assembly LG-267
Filtered power is connected to the driver card via
P1 . +5VDC regulator ICG is bolted to the meter enclo-
sure to increase heat dissipation and connects to the
driver card via P2. C4 provides bulk power storage
while C1 , C2, C3 and C5 through C8 stabilize the 5
volt supply.
Each display driver lC controls 64 LEDs by scan-
ning them in an eight by eight matrix. Segment lines
are current controlled and connect to the LED an-
odes. Digit lines connect to the LED cathodes. Scan-
ning is accomplished by taking each digit line low one
at a time and sourcing current f rom the segment lines
for whichever of the 8 LEDs in a digit group need to be
Page I
Manual **
Iit. The driver chips can also selectively decode BCD
data into 7-segment numeric display signals. Maxi-
mum LED brightness is set by the external resistors.
The drivers further control brightness by pulse-width
modulating the LED on times with a value supplied by
the DSP.
The display drivers accept synchronous serial
data (clock, data, load) in 16 bit strings composed of
an address byte and a data byte. The driver lCs are
arranged in two chip groups. The data out of one chip
is hooked to the data in of the second chip such that 4
bytes can be loaded, two to each chip, with one load
pulse.
lC1 and lC2 drive the upper bargraph (left chan-
nel). lC3 and IC4 drive the lower bargraph (right
channel). lC5 drives the scale indicator LEDs along
the bottom edge of the display.
Avoid removing allthree LED alignment plates if at
all possible. There is very little space around the indi-
cator LEDs and, if any get bent, it can take some time
to reassemble the alignment plate. lf a LED needs re-
placing, pry it out of its socket with a screwdriver and
remove it. Remember to consult the component dia-
gram for the correct orientation before installing a
new LED. Also note that the tri-color LEDs are
graded according to color and brightness. A sticker
on the back of the PCB denotes the correct lot
number needed for reordering.
** Ultra-VU NBCB96 & NBC996 Operation & Service

c1
c2
c3,4
tc1
1 pc.
1 003
RT1
F1
SECTION 5 - REPLACEMENT PARTS LIST
All replacement parls are stocked in depth at the Logitek {actory. Most are also available through local electronic
parts distributors. For your convenience in purchasing replacement parts locally, we include the following parts list.
All Logitek part numbers consist of a two-letter manufacturer code followed by that manufacturer's standard part
number for the item. A list of manufacturers, arranged alphabetically by manufacturer code, follows this parts list in
Section 7.
All resistors are 114 watt, +/- 57o tolerance unless otherwise noted.
BEh/MBOL DESCRIPTION LOGITEK PART NUM-
5-1 Power Supply LG-253 Capacitors
6800 uf/25V electrolytic
.'1 uf/50V ceramic disc
1 00uf/25V electrolytic
lntegrated Circuits
Charge pump
8-pin dip socket
Rectif iers
64 pc mount/240V
Fuses
112 amp slow blow 20mm
Connectors
3-pin large header - locking
3-pin large socket
Power entry module/fuse holder SR-6200.41 15
Switches
S|ide DPDT
Transf ormers
8V, 3A international rating
Super-VU Supply circuit card
Power card (North America)
Capacitors
.1uf/50V ceramic
.047ut|1000V ceramic
.1uf/50V ceramic
'l0uf/25V tantalum
.1uf/50V ceramic
25pf11000V ceramic
15pf/1000V ceramic
Diodes
small signal
5.4Y zener
lntegrated Circuits
** L)ltra-VtJ NBCB96 & NBC996 Operation & Seruice Manttal **
Page 10
IL-68BLBAO25M2CD
NC-.1OOMFsOME2
NI-UFS1 E1O1 MPJ
TI-LT1O54CN
EM-100-083-10-
GI-GBPC-602
LF-218.500
PN.MLSS156-34
PN-CE156F2O-3A
cK-L202-
st-tF-24-16
LG-253C
BE-17251
cE-uK50-104
cE-cw-20c473K
cE-uK50-104
AV-
cE-uK50-104
CE-DD-250
CE-DD-150
Gl-1N4148
S1
121MSO2QE
5-2 Dual Digital/Alarm Card LG-257a
c1,2
c3,4
c5-8
c9-11
TAPl 06KO25HSB
c12-14
c15
c16
D'1-3
D4,5
Gt-1N4734A
P'l
J1
J2
T1
1 pc.
1 pc.

SYMBOL DESCRIPTION LOGITEK PART NUMBER
|c1,2
tc3
tc4
tc5
tc6
lc7
ICB
21 1 sKP55
tc9
'l pc.
1 0031 pc.
1 pc.
J1,2
P3
P4
P5
P6,7
PB
1 pc.
1 pc.
2 pcs.
1 pc.
Y1
FR1-4
RLY1 -3
R1,2
R3,4
R7,8
R9,10
R1 1 ,12
R13-17
s(1-B)
r1,2
1 pc.
ControliAlarm)
5-3 Display Assembly LG-267
C1
TAPl O6KO25HSB
c2,3
NMCl 2O6Z5U1O4M5OT
C4
TAPl OTKO2OCCS
C5
TAPl 06KO25HSB
Page 11
Manual **
AES/EBU receiver
+SVDC regulator/100 mA
+SVDC regulator/1.5A
Quad D flip-flop
Watchdog timer/uP reset
EPROM '16KxB 120ns
DSP 16 bit 1 K/2 ser ports
3 to 8 decoder
8-pin dip socket
32-pin PLCC socket
68-pin PLCC socket
Connectors
BNC PC mount
1O-pin dual row socket
3-pin header
3-pin large header
1O-pin dual row socket
3-pin header
3-pin large socket
3-pin socket
1O-pin dual row socket
2-circuit jumper
Crystal
12,288,000 Hz crystal
Ferrites
bead 600 Ohm @ 100 MHz
Relays
Dry reed SPST 5 volt
Resistors
100K2% 5 position bussed
1 00K
75
1 000
20K B-pos isolated
10K
Switches
Dip switch block
Transf ormers
AES/EBU
circuit card
Capacitors
10uf/25V tantalum
.1 uf/50V Z5U SMT(1206)
100uf/20V tantalum
10ull25Y tantalum
CS-CS8412-CS
MO.MC78LO5ACP
MO-MC78O5CT
MO-MM74HC173D
MM-MAX1232CPA
MC-27C128-121L
AD-ADSP-
MO-MM74HCT138D
EM-100-083-10-
EM-1 50-032 -11-O2
EM-1 50-068 -11-02
AP-31 -71 043-1 0'1 0
PN-050-010-455
PN-MFSSl OO-3A
PN-MFSS156-3A
PN-050-010-455
PN-MFSSl OO-3A
PN-CE156F2O-3A
PN-CE1OOF28-3A
PN-050-010-455
EM-282-11-20
CT-MP122
MU-BLM314601SPT
CP-DS541AO5
cT-770-61-R104
DL-SOMC16O32O3G
CT-194-8MST
ss-67129600
LG-257a (Digital
AV-
NC-
AV-
AV-
** Ultra-VU NBC896 & NBC996 Operation & Service

SYMBOL DESCRIPTION LOGITEK PART NUMBER
c6-8
NMCl 20625U104M507
D1-62
D63
D64-125
D126
D127 -141
.1 ufl5OV Z5U SMT(1206)
Diodes
Tricolor LED bar 2mm x Smm
(order by brightness number on display
Red LED bar 3mm x 6mm
Tricolor LED bar 2mm x 5mm
(order by brightness number on display
Red LED bar 3mm x 6mm
Yellow LED bar 3mm x 6mm
NC-
SY-VBRG5641X
card)
QT-MV571244
SY-VBRG5641X
card)
QT-MV571244
QT-MV53124A
tcl -5
tc6
P1
P2,3
J1
J2,3
R1-5
s1,2
6 pcs.
770 1 pc.
3 pcs
lntegrated Circuits
64 LED driver
+SVDC regulator 1.5A
Connectors
1O-pin dual row header
3-pin header
1O-pin dual row socket
3-pin socket
Resistors
51 00
Switches
pushbutton
64-pin SIP press-in socket
Display circuit card
LED locator plates
MM-MAX7219CWG
MO-MC7BO5CT
PN-051-010-153
PN-MFSSl OO-3A
PN-050-010-455
PN-CE100F28-3A
NK-AB11AP-FA
PR-304-1 3-164-41-
LG-267
LG-268
** lJltra-VU NBC896 & NBC996 Operation & Seruice Manual
Page 12

SECTION 6 _ MANUFACTURERS t'ST
CODE MANUFACTURER LOCATION
AD
AP
AV
BE
CE
CP
CK
CS
CT
DL
EM
GI
IL
LF
LG
MC
MM
MO
MP
MR
MU
NC
NI
NT
PR
PN
SI
SR
SS
SY
Page 13
Manual **
Analog Devices
Amphenol RF/Microwave
AVVStantel Corp.
Belden
Centralab Electronics Div.
CP Clare Corp
C&K Components
Crystal Semiconductor
CTS
Dale Electronics lnc.
Ecam Technology
General lnstruments/Quality Technologies
lllinois Capacitor
Littlefuse
Logitek (Circuit Cards)
Microchip Technology lnc.
Maxim
Motorola Semiconductor Products
Mepcopal
MORS Components lnc.
Murata Electronics NA, Inc.
NIC Components Corp.
Nichicon
Neutrik
Mill-Max Mfg. (Preci-dip)
Panduit Corp.
Signal Transformer
Schurter lnc.
Schott Corp.
Stanley
Norwood, MA
Danbury, CT
Myrtle Beach, SC
Richmond, lN
Milwaukee, Wl
Chicage, lL
Newton, MA
Austin, TX
Elkhart, lN
El Paso, TX
Scottsdale, AZ
Sunnyvale, CA
Lincolnwood, lL
Des Plaines, lL
Houston, TX
Chandler, AZ
Sunnyvale, CA
Phoenix, AZ
San Diego, CA
Wakefield, MA
Smyma, GA
North Amityville, NY
Schaumburg, lL
Lakewood, NJ
Oyster Bay, NY
Tinsley Park, lL
Inwood, NY
Petaluma, CA
Minneapolis, MN
Battle Creek, Ml
** Ultra-VU NBCB96 & NBC996 Operation & Service

SECTION 7 - DIAGRAMS
.. lJltra-VtJ NBCB96 & NBC996 Operation & Service Manual**
Page 14

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