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Easily Test And Restore CRTs With The Most Complete
Tests Available For Added Profit And Security.
S
CR7000
CRT Analyzer & Restorer
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The cathode ray tube (CRT) is
still the display of choice.
CRTs are virtually
everywhere – from
home TV, projection TV, studio
monitors, video
walls, computer
monitors, data
terminals, medical displays, video games, security systems, radar, business,
industry, and more. They remain the “king of displays” providing the best overall display performance vs. cost of any display technology.
Refinements to CRTs over the past decade have
improved contrast, resolution, convergence, focus,
and deflection angles. CRTs are now larger and displaying higher resolution than just a decade ago.
CRT displays now commonly offer resolutions of
1280 x 1024 producing over 1.3 million picture elements. Jut a decade ago, VGA monitors were being
introduced with resolutions of only 640 x 350.
But like CRTs of the past, an electron gun consisting of a filament, cathode, control grid, and accelerating grid is at the heart of the CRT’s performance. The electron gun emits the electrons which
are accelerated to the CRT’s phosphor screen. The
electron gun of the CRT is susceptible to aging and
a gradual decrease in performance.
A decade ago, marginal decreases in CRT electron
gun performance had only a slight impact on the
displayed video. But today the same minor decreases in the CRT’s electron gun performance impacts
the displayed video resulting in unacceptable
contrast, brightness, or focusing. Refinements to
the electron gun have left it more vulnerable to
damage with restoration attempts from existing
CRT rejuvenators.
What does all this mean to you as a servicer, maintenance technician, or business manager? It means to
accurately identify CRT electron gun problems
today, a CRT Analyzer & Restorer must provide
more precision tests than a decade ago. It must
more closely duplicate the circuit’s biasing voltages
on the CRT electron gun. It must compare gun
conduction currents to the CRT manufacturer’s
specified performance levels to accurately identify
emission related focus, contrast, or smearing problems. It must more closely compare the levels of
conduction currents from black video (cutoff) to
full emission to detect contrast and color tracking
problems. It must provide more delicate restoration
options. A CRT analyzer today must also perform
these needed tests faster with easier hookup and
test interpretation.
The new Sencore CR7000 “BEAM-RITE”™ CRT
Analyzer & Restorer provides the precision CRT gun
analyzing tests and improved restoration capabilities
demanded by the CRTs of this decade and beyond.
New Demands From Higher Performance CRTs
Require New Analyzing Techniques
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CRT Displays:
CRT Displays:
Slow But Steady Growth
Slow But Steady Growth
Worldwide sales of CRT displays for
desktop computers, workstations and terminals
80
60
40
20
0
1994 1996 1998 2000 2002
(millions of units)
Source: Stanford Resources Inc.
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The cathode ray tube (CRT) is a vacuum tube that
converts electrical impulses into visual images. The
CRT is used to display images on televisions, computer and information terminals, oscilloscopes, RGB
monitors, and radar displays. Let’s take a look at how
the CRT works, and what makes it fail.
How Does The CRT Work?
The major elements of the CRT are the:
• Heater or Filament (H)
• Cathode (K)
• Control Grid (G1)
• Screen Grid (G2)
• Accelerating Grids
• Phosphor Coated Screen
The cathode is coated with a material that releases a
large number of electrons when heated. As the filament heats the cathode, the negatively charged electrons are released as a positive voltage attracts them.
The control grid (G1) controls the amount of electrons that are pulled from the cathode surface to
form the beam that strikes the CRT screen. As the
negative bias applied to the grid changes, G1 opens
and closes (much like the iris of a camera lens), to
change the intensity of the electron beam.
The screen grid (G2), biased with 200 to 600 volts,
attracts the negatively charged electrons through the
tiny hole in the control grid.
The accelerating grids have even higher voltages that
increase the velocity of the electrons through the
neck of the CRT until they strike the phosphorous
coated screen. Internal plates or external coils deflect
the beam vertically and horizontally across the
screen, producing the visual image.
What Fails In The CRT?
When a CRT fails, it produces a noticeably degraded
picture. A defective CRT can produce pictures with
excess or absence of a color, full beam conduction,
no picture, dark picture, silvery look, or even arcing.
A CRT can fail for several reasons: open filaments,
H-K short, poor cutoff, poor emission, and bad color
tracking to name a few.
Fortunately, a good working CRT has specific operating characteristics for beam current with specific
biasing and G2 voltage. The CRT manufacturers use
items like the “cutoff chart” shown here to specify
the operation of their CRTs. You’ll notice that the
proper beam current is relative to the voltages
applied, and thus requires the CRT tester to adjust
its good and bad measurement points accordingly.
This is called a sliding good/bad scale that changes
with the bias voltages applied to the specific CRT.
CRT manufacturers are also specific that the three
beams in a color CRT must track each other. Small
variances can be compensated by the servicer controls (drive and screen) as long as the beams are
within a specific range. Specification call for the low
level tracking to be within a ratio of 1.25:1 and the
high level tracking of 1.55:1. There’s only one CRT
analyzer that tests CRTs to these ratios.
Only the New and Exclusive CR7000 “BEAM-RITE”
CRT Analyzer & Restorer tests CRTs to manufacturer
specifications. Only the CR7000 provides a complete
set of tests along with the safest restoration levels
(progressive restoration) to ensure that you catch all
defective CRTs and can safely restore most defects.
Knowing How CRTs Work And How They Fail Shows Why You
Need A Complete CRT Analyzer Like The CR7000 “BEAM-RITE”™
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1000
800
600
400
200
0
-200
500 100 150 200
G2 Voltage
G1/Cathode Bias Voltage
Minimumcutoffof any gun
Maximum cutoff of anygun
Focus
Grid (G4)
Accelerator
Grids (G3, G5)
Screen
Grid (G2)
Control
Grid (G1)
Cathode
(K)
Filament
(F1, F2)
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Call 1-800-SENCORE(736-2673)
1. More confidently and quickly determine if
defects are in the CRT gun or TV chassis.
2. Positively determine if the CRT gun is
defective before investing service time and
money that cannot be recovered.
3. Confidently give repair estimates and make
repair feasibility decisions.
4. Increase user or customer repair satisfaction
by confidently restoring CRT performance.
5. Increase the number of successful repairs
and add profit by restoring the CRT vs.
recommending CRT replacement.
6. Save money by restoring the CRT adding
years of useable display life while avoiding
costly CRT replacement.
7. Reduce CRT analyzing time to less than
three minutes to service/refurbish faster.
The CR7000 “BEAM-RITE”CRT Analyzer & Restorer Enables You To:
Easily Test And Restore CRTs With The Most Complete
Tests Available For Added Profit And Security
Test All CRTs, Including: Computer Monitors, Video Displays, Televisions,
Projection TVs, Scopes, & Special Application CRTs – The CR7000 now has full
dynamic range to test older CRTs and the new ones
The Easiest To Use CRT Tester On The Market
• Simply connect one of the supplied adapters to test virtually all new CRTs
without setting and resetting setup switches
• All three guns of color CRTs are tested, and results displayed, simultaneously
• All gun tests are displayed with interpretation-free “Good/Bad” results
The Most Accurate And Thorough Tests Of Any CRT Tester
• Full bias ranges with a sliding “good/bad” scale
• Exclusive “Lo Level” and “High Level” emission tracking
• Detects all gun element shorts or leakage
The Safest And Most Effective Restoration Techniques Available - The multiple
levels of restoration guarantee the safest possible restoration
• Six levels of “Progressive Restoration”
• Self-limiting shorts removal function
• Three times the restoration range of other testers
Newly Designed Sockets Allow Easy Connection To Hard To Reach CRTs – New
socket design allows the user to test projection TVs and computer monitors faster
and easier
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CRT Analyzer & Restorer
CR7000
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Exclusive –
Only From Sencore
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Easily compare the
emission of all three
projection CRTs
simultaneously as the
CR7000 stores the
reading for you
Easy-to-follow
directions walk
you through all
CRT tests
Separate G2 controls
for each gun provide
accurate and dynamic
tracking tests
Interpretation–
free color CRT
gun tracking tests
New restore functions
offer the safest and most
effective restoration of any
tester
• “Ready” LED guides you
through each restoration
• Safely remove G1 shorts
• Rejuvenation feature helps
with stubborn cathodes
• Full control over the
amount of restoration
View all tests of all
three color CRT
guns simultaneously
for faster analyzing
and quick gun
comparisons
Full bias range tests
CRT guns at their
normal operating bias
to closely duplicate
normal operation
Durable, flexible sockets
provide easy connection
to CRTs – especially
projection and
computer monitors
Accurately test
all CRT types
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G1 & H-K Short Tests
When testing a color CRT gun, the G1 Short and
H-K Short tests are performed simultaneously on the
red, green, and blue electron guns. The three-bar
graph display indicates the resistance of the respective guns simultaneously. You know at a glance if
any of the color guns has an inter-element short.
Cutoff Test
The CR7000 is the only CRT analyzer that accurately simulates cutoff bias conditions relating to the
manufacturer’s specified range and circuit bias conditions. Other CRT testers offer only a few bias voltages to -100 volts and do not properly duplicate true
cutoff voltage conditions or measure true beam current to the G2 grid. As a result, these testers may
produce setup or cutoff current that shows the gun
is OK, when it really isn’t.
Lo Tracking Test
The Lo Tracking test compares the level of G2 voltage needed by each gun to produce cutoff current.
It is automatically performed while testing cutoff of
all three guns of a color CRT. The “Good” GUN
TRACKING LED lights when all three guns are
conducting within the “Cutoff” area of the display,
and the G2 voltages are within a ratio of 1.25:1.
Emission Test
First, the CR7000 measures “true beam” current or
the current passing from the cathode, through the
opening in G1, and on to G2. This provides the best
representation of the actual CRT beam current that
strikes the phosphor screen. A second and exclusive
feature of the CR7000 is a “sliding” Good/Bad scale
for testing emission to manufacturer specifications.
Hi Tracking Test
The CR7000’s Hi Tracking test compares the peak
emission levels of each gun of the color CRT. The
Hi Tracking test automatically calculates the tracking ratio as it simultaneously displays the emission
readings for all three guns. The “Good” GUN
TRACKING LED lights when all three guns have
emission currents resulting in a ratio within 1.55:1.
Emission Life Test
The CR7000’s Emission Life Test cools the cathodes
slightly by decreasing the filament voltage by 25%. A
cooled cathode produces less emission, but most
good cathodes are capable of producing more current than is needed for full beam current (white
picture level).
Seven Analyzing Tests Accurately Pinpoint
CRT Gun Problems Other Testers Miss
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These common shorts are automatically tested with the CR7000
and the display shows which elements have the short.
Measure the emission “true beam” current with a sliding Good/Bad
scale while testing the gun tracking ratio to manufacturer standards of 1.55:1.
Automatically tests the cutoff of all 3 guns and compares the
ratio of the test results to manufacturer standards of 1.25:1.
G1 Shorts Test
Emission & Hi Tracking
HK Shorts Test
Cutoff & Lo Tracking
NEW
NEW
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The six levels of the CR7000’s progressive restoration helps
prevent CRT over-restoring and minimal potential damage.
Re-activate
The CR7000 “Re-activate” function safely activates
the existing cathode emitting material with little or
no threat to the CRT gun. Re-activation also works
well on some CRT guns that have aged causing
minor cathode contamination or poisoning. You can
use the Re-activate function repeatedly with little
threat of damaging the CRT cathode.
Restore
The CR7000 “BEAM-RITE” offers four automatic
CRT “Restore” functions to return near normal performance to the CRT cathode. The four functions
are progressive levels of current and current durations including Low, Normal, High, and Extended.
The Low Restore function uses a brief two second
current, limited to 40 mA, to heal the contaminated
cathode surface. The Low Restore function uses a
much lower current and shorter current duration
than offered by any other CRT tester. On many weak
cathodes, this is enough to be effective while eliminating the cathode damage that would result from
other testers and higher levels of restore currents.
The Normal Restore function offers additional
restore current, limited to 80 mA, and two automatic
cycles lasting three seconds each. The higher current and duration removes the contamination more
aggressively from the cathode while permitting a
three second pause between current cycles.
The High Restore functions boost the filament voltage to superheat the cathode while increasing the
maximum current to 100 mA. The High Restore
function is effective in removing thicker cathode
contamination. For tougher cathode contamination,
the Extended Function draws continuous restore
current up to 15 seconds.
Remove G1 Short
In the “Remove G1 Short” function, the cathode (K)
and G2 grids are connected together. The filament
voltage is removed to cool the cathode and prevent
filament or cathode damage. After a delay, pressing
the “Press To Restore” button discharges a 450 volt
capacitor through the short path between the G1
and the K/G2 connection.
Rejuvenation
Rejuv applies the normal filament voltage and a high
positive voltage potential of a charged capacitor to
the G1 grid. This produces momentary high forward
or positive bias on the CRT cathode. Rejuv often
successfully breaks open the contamination layer on
severely contaminated cathodes producing a high,
fast discharge current between the cathode and G1.
Six Levels Of Progressive Restoration –
Safely Restore More CRTs
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Four exclusive levels of progressive restoration allow you to use
only what the gun needs to restore its operation.
The CR7000 connects the cathode to G2 and applies a 450 volt
charge to the G1 to remove any shorts.
Used on CRTs with severe cathode contamination, this function will
break through the contamination.
Restoration
Rejuvenation
Remove G1 Shorts
Re-activate 30 sec. (1 mA)
Low – 2 sec. (40 mA)
Normal – 2 cycles (80 mA)
High – 3 cycles (100 mA)
Extended – 15 sec. (100 mA)
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G2 Voltage
Range: 10-400 VDC Video 1, Proj, and Scope; 15-600 VDC Video 2
Range: Video & Projection - 20, 36, 52, 68, 84, 100, 116, 132, 148,
164, 184 VDC Scope - all bias voltages divided by 10
Shorts Tests
Tests inter-element resistance and displays result on bar graph.
Filament Voltage
Range: 0 - 4; 4 - 8; 8 - 16 VDC. Continuously variable within
selected range.
Cutoff & Lo Tracking Test:
Tests ratio of G2 voltages needed to produce cutoff current in
all 3 guns of a color CRT or projection system.
Emission Test
Measures true beam current reaching G2. Without momentary
0 bias.
Life Test
Provides indication of cathode reserve current by lowering
filament voltage 25%.
Hi Tracking Test
Automatically compares emission currents between highest and
lowest guns in “Simultaneous” gun test and indicates Good/Bad
result with LED.
Restore Functions
Progressive restore functions apply positive biases and increased
filament voltages for cathode super-heating.
Reactivate Restore
Filament voltage: 50% boost, ± 5%
Current limit: 1 mA max. all CRT types at
117 VAC (or 220 VAC) line voltage
Time: user controlled button, automatic timeout after 30 seconds
Low Restore
Filament voltage: normal, (no boost)
Current limit: 40 mA max. all CRT types at 117 VAC (or 220
VAC) line voltage
Time: user controlled; automatic time-out after 2 seconds
Normal Restore
Filament voltage: normal, (no boost)
Current limit: 80 mA max. all CRT types at 117 VAC (or 220
VAC) line voltage
Time: 2 automatic cycles of 3 seconds ON and 3 seconds OFF.
High Restore
Filament voltage: 50% boost ± 5%
Current limit: 100 mA max. Video & Projection, 80 mA scope
type at 117 VAC (or 220 VAC) line voltage
Time: 3 automatic cycles of 4 seconds ON and 2 seconds OFF.
Extended Restore
Filament voltage: 50% boost, ± 5%
Current limit: 100 mA max. Video & Proj, 80 mA Scope at 117
VAC (or 220 VAC) line voltage
Time: user controlled; automatic time-out after 15 seconds
Remove G1 Short
Method: Capacitive discharge between G1 & K/G2 occurs after
20 second delay for filaments to cool.
Rejuv
Method: Capacitive discharge between G1 & K (positive bias)
with normal filament voltage.
General
Display: Three, 40 segment LED bar graphs
(20 green and 20 red segments) with
Filament Voltage scale and Cutoff set box.
Size: 7” x 12” x 8” HWD
Weight: 13 lbs.
Power: 105-125 VAC 50/60 Hz, 90 watts max.
210-230 VAC operation is available.
#6567
S
3200 Sencore Drive, Sioux Falls, SD 57107
Direct:(605)339-0100 Fax:(605)339-0317
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CR7000 “BEAM-RITE”™ Condensed Specifications
Call 1-800-SENCORE(736-2673)
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