HP CRT Monitor s7500, MV7500, CV7500, S7500 Service Manual
17-inch Color Monitor
S7500/MV7500/CV7500
Se rvice Manual
Page 27
HP S7500/MV7500/ CV7500
Service Manual Versions and Revision
Copyright
Copyright 2002 Lit eOn Technology Corp.
All Rights Reserved
This manual may not , in whole or in part, be
copi ed, photocopied, reproduced, translated, or
converted to any elect ronic or machine readable
form without pri or written permission of LiteOn
T echnology Corp.
HP S7500/MV7500/CV7500 Service Manual.
Pr inted in Taiwan.
Trademarks
Lit eOn is a registered trademark of LiteOn
T echnology Corp.
All other trademarks are the property of their
respective owners.
No. Version Release Date Revision
1. 1.0 FEB. 27, 2003 Original release
Page 1
HP S7500/MV7500/ CV7500
Table of Contents
1. Precautions.................................................................................................................2
2. Product Specifications ..............................................................................................5
3. Operation Theory .....................................................................................................10
4. Alignments and Adjustments ...................................................................................14
5. T roubleshooting ........................................................................................................18
6. Recommended Spare Parts List ..............................................................................24
7. Block Diagram..........................................................................................................26
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HP S7500/MV7500/ CV7500
1 Precautions
Fol low these safety and servicing precautions to prevent damage and to protect against potential hazards
such as elect rical shock and X-rays.
1-1 Safety Precautions
1-1-1 Warnings
1. For safety purpose, do not attempt to modify
the circuit board, and always disconnect the AC
pow er before performing servicing on the
moni tor.
2. Operat ion of the monitor outside its cabinet or
with the cover removed involves the risk of
shock hazard. Repair work on the monitor
shoul d only be attempted by service personnel
who are t horoughly familiar with all necessary
safet y precautions and procedures for working
on high volt age equipment.
3. D o not lift the CRT by the neck. After
completel y discharging the high voltage anode,
handle t he CRT only when wearing shatterproof
goggles. T ry to keep the CRT away from the
body during handling.
4. Hi gh voltage should always be kept at the rated
value, no higher. Only when high voltage is
excessi ve are X-rays capable of penetrating the
shell of the CRT . Operation at high voltages
may also cause failure of the CRT or high
voltage ci rcuitry.
5. The CRT is especially construct ed to limit Xray emi ssion to 0.5mR/HR at 300 microamperes
anode c urrent. To ensure continued X-ray
protection, repl ace the CRT with only the same
or equivalent type as t he original, and adjust the
anode’s voltage to the designated maximum
rat ing, never to exceed.
1-1-2 Safety Checks
Before returning the monitor to t he user, perform
the following safet y checks:
1. Inspect to make certain that each lead dress is
not pin ched or that hardware is not lodged
between the chassis and other met al parts in
the monitor.
2. In spect all protective devices such as
nonmet allic control knobs, insulating materials,
cabinet backs, adjustment and compartment
covers or shields, isol ation resistor-capacitor
networks, mechanical i nsulators, etc.
3. AC L eakage Current Check
Always perform the AC Leakage Current
Check on the exposed metal parts, incl uding
metal cabinet s, screwheads and control shafts,
as follows:
a) Plug the AC line cord directly i nto a rated
A C outlet. Do not use an isolation
transformer during the check.
b) Use an AC volt meter with at least 5000
ohms per vol t sensitivity as follows:
Con nect a 1500 ohms, 10 watt resistor
parall eled by a 0.15uF AC capacitor in series
wit h all exposed metal cabinet parts and a
known earth ground, such as electrical
conduct or electrical ground connected to
earth ground, as shown in the Fi gure 1-1.
Me asure the AC voltage across the
combinati on of resistor and capacitor.
c) Reverse the AC plug at the AC outlet and
rep eat the steps for AC voltage
measurement s for each exposed metal part.
d) Vol tage reading must not exceed 0.3 volts
RMS , equivalent to 0.2 milliampere AC. Any
value exceeding this limit ill constitute a
p otential shock hazard and must be
corrected i mmediately.
Figure 1-1. Set Up For AC Leakage Current Check
To known
earth ground
1500 ohm 10 watt
0.15ufd
To exposed metal
cabinet part
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HP S7500/MV7500/ CV7500
1-1-3 Product Safety Notices
Many elect rical and mechanical parts in this chassis have special safety-related characteristics which are
often not evident from visual inspection, the protection afforded by them may not be obtained by replacing
them wit h components rated for higher voltage, wattage, etc. Before replacing any of these components,
consult t he Recommended Spare Parts List given at the end of this manual. Any of the replacements that do
not provide the same safety characteristics may result in shock, fire, X-ray emission or other hazards.
1-2 Servicing Precautions
Warn ing: An el ectrolytic capacitor installed with the wrong polarity might explode.
Caution: Before performing servi cing covered by this service manual, read and follow the Safety Precautions
section of this manual.
Note: If unforeseen conflict between the fo llowing servicing precautions and any of the safety
precautions, always foll ow the safety precautions
1. Follow cl osely the servicing precautions printed on the monitor cabinet and chassis.
2. Al ways unplug the AC power cord from the AC power source before removing or installing any component
or assembly, disconnecti ng PCB plugs or connectors and connecting a test component in parallel with a
capacit or.
3. When repl acing parts or circuit boards, clamp the lead wires around the component before soldering.
4. When replacing a high wattage resistor (>0.5W metal oxide film resistor) in the circuit board, keep the
resistor about 1 cm (1/2 inch) away from the ci rcuit board.
5. Keep wires away from the high vol tage or high temperature components.
6. Keep wires in their ori ginal positions so as to minimize interference.
7. Al ways connect a test instrument’s ground lead to the instrument chassis ground before connecting the
posit ive lead; always remove the instrument’s ground lead last.
After put ting the rear cover back and make sure the monitor is working properly, the Hi-Pot &
Ground Conti nuity tests MUST BE performed before the monitor is returned to user.
1-3 Hi-Pot Test
1. T est Equipment
Puncture t est model PM5530 ADT or KIKUSU TOS-8750 voltage tester or equivalent approved equipment.
Not e : The test equipment must be calibrated in regular period.
2. T est Setup
a) Apply volt age : DC 2100 VDC
b) T est duration : 3 seconds
c) Cut off current should be set to 3 mA
3. T est Procedure
a) Unplug power cord from AC source.
b) Put the power swi tch of the monitor in the “ON” position.
c) Leave signal cable un-connected.
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HP S7500/MV7500/ CV7500
d) Plug monitor power cord to the Hi Pot tester terminals.
e) T urn on tester and watch the indicator or beeper.
f) If the indicator lamp lighten, or beeper beeps, the test fails.
1-4 Ground Continuity Test
1. T est Equipment
AC low ohm t ester TOS-6100 or equivalent approved equipment.
Not e :The test equipment must be calibrated in regular period.
2. T est Setup
a) T est duration : 3 seconds
b) Set current limit at 25 A
c) The grounding resist ance must be less than 0.1 ohm.
3. T est Procedure
a) Plug the monitor power cord to the tester terminals.
b) Make sure all connections are wel l-contacted.
c) T urn on monitor power and tester power.
d) Press “T est” button.
e) If green light shows up, means test OK.
If red l ight shows up, means test fails.
f) If the Tester has a digital display, the resistance value must not exceed 0.1 ohm.
Not e :Be sure not to touch the metal portion of the signal cable head during testing.
Page 5
HP S7500/MV7500/ CV7500
2 Product Specifications
2-1 Specifications
Not e: Above specifi cations are subject to change without prior notice.
Picture Tube
17-inch (16-inch Visual image area), sloted mask, 90 degrees
deflection, dot type black matrix, medium short persistence
phosphor, dark tint, non-glare/ anti-static screen,
0.27 mm dot pitch for E1770NSL/T and 0.25mm dot pitch for HP
S7500/MV7500/CV7500
Scanning Frequency
VGA, Super VGA, 1024x768@60/70/75/85 Hz
1280x1024@60Hz
Maximum Resolution 1280 dots (H) x 1024 lines (V) @60Hz refresh rate
Display Area 306 mm (H) x 230 mm (V) typical
Display Characters 80 char. x 60 rows on a 10 x 10 matrix
Display Colors Analog
Input
Unlimited Colors
Synchronizatin Signals Separate Sync: horizontal/vertical, TTL, positive or negative
Synchronization
Frequencies
Horizontal : 30 to 70 kHz
Vertical : 50 to 140 Hz
Signal Connectors 15-pin, D-shell connector
Video Signals Analog : 0.7 Vp-p, RGB positive
Power Input 75 Watts (maximum) AC rated voltage, 100VAC to 240VAC
Misconvergence Center Area : < 0.3 mm; Corner Area : < 0.4mm
User Controls Power On/Off, Contrast, Brightness, Horizontal Size, Horizontal
Position, Vertical Size, Vertical Position, Pincushion, Trapezoid,
Rotation, Color temperature, Language, Display Frequency,
Degauss, Recall, H. Moire,
V. Moire
Service Controls PWB-1709
PWB-1707 : power voltage adjust (VR801)
Preset Modes 8 (see Table 2-2. Timing Chart)
Environmental
Considerations
Operation temperature : 10oC to 40oC ambient
Operation Humidity : 20% to 80% ambient
Storage temperature : -40oC to 65oC ambient
Storage Humidity : 10% to 90% (non-condensing)
Altitude : Non operating 40,000 feet sea level
operating 10,000 feet sea level
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HP S7500/MV7500/ CV7500
2-2 Signal Cable Pin Connections
Table 2-1. Signal Cable Pin Assignment
Note * This pin i s used for selftest detection. Connect this pin to ground at the PC end.
** For PC 99: This pin will provide +5V from PC side.
Pin Signal Pin Signal
1 Red video 9** +5V
2 Green video 10 Digital Ground
3 Blue video 11 Ground
4 Ground 12 SDA
5* NC 13 H-Sync
6 Red ground 14 V-Sync/VCL
7 Green ground 15 SCL
8 Blue ground
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HP S7500/MV7500/ CV7500
2-3 Timing Chart
This section describes the ti mings that the computer industry recognizes as standard for computer-generated
vi deo signals.
Table 2-2. Timing Chart
H.Parameters:
A: Peri od B: Blanking T ime
C: Sync W idth D: Back Porch
E : Active Time F : Front Porch
V.Parameters:
G: Peri od H:Blanking T ime
I: Sync W idth J: Back Porch
K: Act ive Time L : Front Porch
Seperate Sync
Horizontal
Video
C
D
E
Sync
A
B
F
Vertical
Video
I
J
Sync
G
H
L
K
Mode 1 2 3 4 5 6 7 8 9
H. Dots 640 720 640 640 800 800 1024 1024 1280
V. Dots 480 400 480 480 600 600 768 768 1024
H-freq (kHz) 31.47 31.47 37.5 43.27 46.8 53.67 60.02 68.68 63.98
Sync Polarity - - - - + + + + +
A period us 31.78 31.78 26.666 23.11 21.333 18.63 16.66 14.56 15.63
B Blanking us 6.356 6.356 6.349 5.33 5.172 4.409 3.657 3.725 3.778
C Sync us 3.81 3.81 2.032 1.556 1.616 1.138 1.219 1.016 1.037
D B.P. us 1.907 1.907 3.81 2.22 3.232 2.702 2.235 2.201 2.296
E Active us 25.42 25.42 20.37 17.78 16.162 14.22 13 10.836 11.852
F F.P. us 0.636 0.636 0.51 1.556 0.323 0.569 0.203 0.508 0.444
V-freq (Hz) 59.95 70.08 75 85 75 85 75.03 85 60.02
Sync Polarity - + - - + + + + +
O Period ms 16.68 14.27 13.3 11.76 13.333 11.76 13.33 11.77 16.661
P Blanking ms 1.43 1.557 0.533 0.67 0.533 0.578 0.533 0.582 0.656
Q Sync ms 0.064 0.064 0.08 0.069 0.064 0.056 0.05 0.044 0.047
R B.P. us 1.02 1.08 0.427 0.578 0.448 0.503 0.466 0.524 0.594
S Active us 15.25 12.71 12.8 11.09 12.8 11.18 12.8 11.18 16.005
T F.P. us 0.35 0.413 0.027 0.023 0.021 0.019 0.017 0.015 0.016
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