Mitsubishi HL7925K Series User manual

).. MITSUBISHI
AUTO-TRACKING WITH Dl.GITAL CONTROL
COLOR DISPLAY MONITOR
~ ~ODEL
I
HL7925K SERIES
For future reference, record the serial
number of your display monitor in the
space below:~---------,
SERIAL No.
'---------~
The serial number is located on the rear
cover
of the set.
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,CAUTION
These products or technologies are subject to
Japanese and/ or COCOM strategic restrictions,
and diversion contrary thereto is prohibited .
USER'S GUIDE

\.
CAUTION
• The line cord and plug designed for safety is provided with this set.
It is to 6e used with a properly grounded power receptacle to avoid possible electrical
shock.
•Do not remove the back cover of the set as this can expose you to very high voltages
and other hazards.

For Model HL7925K and HL7925KW Series:
WARNING
RADIO INTERFERENCE REGULATIONS STATEMENT
FOR U.S.A.
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part
15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated
in a
commercial environment. This equipment generates, uses, and can radiate radio fre-
quency energy and, if not installed and used in accordance with the instruction manual,
may cause harmful interference to radio communications. Operation of this equipment
in
a residential area is likely to cause harmful interference in which case the user will be
required
to correct the interference at his own expense.
THIS PRODUCT HAS BEEN FCC-CERTIFIED WITH A SHIELDED
SIGNAL COAXIAL CABLE.
USE IT TO REDUCE THE POSSIBILITY OF CAUSING INTERFER-
ENCE TO RADIO, TELEVISION, AND OTHER ELECTRONIC
DEVICES.
RADIO INTERFERENCE REGULATIONS STATEMENT
FOR CANADA
This digital apparatus does not exceed the Class A limits for radio noise emissions from
digital apparatus set out in the Radio Interference Regulations
of the Canadian Depart-
ment of Communications.

(CONTENTS ]
1. SPECIFICATION
1.1 Rating and Specification ......•.................... .4
1.2 Input Signals ..................................... 5
1.3 Recommended Timing Chart ......................... 6
2.
INSTALLATION
2.1 General ......................................... 7
2.2 Unpacking
....... - ................................ 7
2.3 Installation
Place .................................. 7
2.4 Caution before Power
ON ........................... 8
2.5
Degaussing ....................................... 9
2.6 Connection
of Signal Cables ......................... 9
3. CONTROLS LOCATION
AND DESCRIPTION
3.1 Under normal operation ........................... 12
3.2 When adjusting the picture dimensions ................ 16
3.3 Explanation on Channel ........................... 19
4. ADJUSTMENT
4.1 Preparation ..................................... 21
4.2 Procedure ...................................... 21
4.3 What picture comes out? .......................... 25
5. QUICK CHECK
5.1 Monitor screen is blank ............................ 27
5.2
Monitor screen Image is too dim or bright .............. 27
5.3
Monitor generates beep sound ....................... 28
5.4 Booming sound just after power
"ON" ................ 28
5.5
Monitor screen is not stable ......................... 28
6. CARE and
MAINTENANCE
6.1 General ........................................ 29
6.2 Operation
...................................... 29
6.3 Cleaning
....................................... 30

( 1. SPECIFICATIONS
1.1 Rating and Specification
1) AC POWER VOLTAGE
2) AC POWER FREQUENCY
3) POWER CONSUMPTION
4) INPUT SIGNAL
VIDEO
SYNC.
5) INTERFACE
a) INPUT CONNECTOR
b) INPUT IMPEDANCE
6) SCANNING FREQUENCY
7) PRE-SET TIMING
8) WARM UP TIME
9) EFECTIVE DISPLAY AREA
1
0) BRIGHTNESS
11) VIDEO AMPLIFIER
12) BLANKING TIME
13) LINEARITY
14) RASTER DISTORTION
15) RASTER SIZE REGULATION
16) MISS CONVERGENCE
17) HIGH VOLTAGE
18) TEMPERATURE
19) OUTLINE SIZE
20) WEIGHT
MODEL
HL7925 *K
HL7925 * KV
HL7925*KW
50/60 Hz
150 w(typ)
Analog R,G,B
RATING
AC100-120V
AC 220 "'240V
AC 100"' 120 V
AC
220,..... 240V
Composite sync. on Green : 0.7 Vp-p (Positive)
0.7 Vp-p (Negative)
Composite ext. sync. 1.5 ,....., 5 Vp-p (Negative)
Separate sync. (HD/VD)
,.....,
5 V _ (Positive ) 1
·5 P P Negative
BNC (Receptacle)
75.0 for video and sync. signal
High impedance can be selected by Impedance
Select
SW.
Loop-through operation is available with T-type
BNC connector.
HORIZONTAL 30 kHz ,....., 78 kHz
VERTICAL 50 Hz ,....., 120 Hz
See the recommended timing chart specification. (page 6)
More than 30 minutes.
360 (W) X 270 (H) mm
100 nit with STD CRT, standard white window
video signal.
50 Hz,....., 120 MHz±3 dB Tr/Tf<6 nsec
Horizontal 55- 78 kHz < 3.2µsec
40-55 kHz < 5.0µsec
30-40 kHz < 6.0µsec
Vertical < 600µsec
Better than 7%
Note; H-LIN will be specified for
FH =30-37 /47-52/60-64 kHz/75 ,....., 78
Less than 2.0%
Less than 0.5%
Center (Within 270 mm diameter circle) -0.35 mm (Typ)
Other area -0.5 mm (Typ)
27 kV (STD)
O ,....., 40°C (with standard cabinet)
498 (W) x 449 (H) X 534 (D) (with standard cabinet)
Approx. 33 kg
4
]

[~s_P_E_C_IF_IC_A_Tl_O_N ____________________ ]
1.2 Input Signals
SYNC. SIGNAL INPUT SIGNALS POLARITY
RED
0.7 Vp-p TYP
POSITIVE
A COMPOSITE SYNC. BLUE
(0.35,....., 1.4 Vp-p AVAi LAB LE)
SIGNAL ON GREEN
VIDEO SIGNAL GREEN
1.0 Vp-p TYP
(0:7 Vp-p VIDEO)
VIDEO: POSITIVE
(0:3 Vp-p SYNC.)
SYNC. : NEGATIVE
RED
BLUE
0.7 Vp-p TYP
POSITIVE
(0.35,....., 1.4 Vp-p AVAILABLE)
COMPOSITE EXT GREEN
SYNC. SIGNAL COMPOSITE
4.0 Vp-p TYP
NEGATIVE
SYNC.
(1.5 ,.....,5.0 Vp-p AVAILABLE)
RED
BLUE
0.7 Vp-p TYP
POSITIVE
SEPARATE
(0.35,....., 1.4 Vp-p AVAi LAB LE)
HORIZONTAL & GREEN
VERTICAL
SYNC. SIGNAL HORIZONTAL
4.0 Vp-p TYP
NEGAT%
VERTICAL
(1.5,....., 5.0 Vp -pAVAi LAB LE)
POSITIVE
SYNC.
5

(
1 .3 Recommended Timing Chart
TIMING-1 (Pre-set in CH. 0)
Th 13.158 µsec (76 kHz)
Ths
1.1
µsec
Thfp 0.158 µsec
Thbk 3.058 µsec
Tv 14.29 msec
(1024H)
Tvs 39.0
µsec
Tvfp 39.0
µsec
Tvbk
815.0 µsec
TIMING-2 (Pre-set in CH. 0)
Th
Ths
Thfp
Thbk
Tv
TVs
Tvfp
Tvbk
15.788 µsec (63.3 kHz)
1.701 µsec
0.407 µsec
3.957 µsec
16.672 msec (1056H)
47.0 µsec (3H)
47.0 µsec (3H)
504.0 µsec (32H)
TIMING-3 (Pre-set in CH. 0)
Th 20.960 µsec (47.7kHz)
Ths 2.000
µsec
Thfp 1.000 µsec
Thbk 5.000 µsec
Tv 16.667 msec (795H)
TVs 84.0
µsec (4H)
Tvfp 63.0 µsec (3H)
Tvbk 566.0 µsec (27H)
T
6
SPECIFICATION ]
LJ
TIMING-4 (Pre-set in CH. 0)
Th 26.4
µsec (37.9kHz)
Ths 3.2
µsec
Thfp
1.0 µsec
Thbk 6.4 µsec
Tv
16.58 msec (600H)
TVs 106.0
µsec
Tvfp 26.0
µsec
Tvbk 739.0
µsec
TIMING-5 (Pre-set in CH. 8)
Compatible Timing for VGA 3 modes
Th
31. 778 µsec (31.5kHz)
Ths 3.813
µsec
Thfp 0.636
µsec
Thbk 6.356 µsec
480 LINE (60 Hz)
Tv
16.683 msec
TVs 64.0
µsec
Tvfp 318.0
µsec
Tvbk 1430.0
µsec
400 LINE (70 Hz)
Tv 14.268 msec
TVs 64.0
µsec
Tvfp 381.0
µsec
Tvbk
1557.0 µsec
350 LINE (70 Hz)
Tv 14.268 msec
TVs 64.0
µsec
Tvfp
1176.0 µsec
Tvbk 3146.0
µsec

(_2_.l_NS_Ti_A_LL_A_~l_O_N __________ )
2.1 General
This section explains how to install the monitor and how to verify its basic
operation. The monitor is throughly adjusted and checked out at the factory,
but it may require certain minor adjustments to adapt it to a particular display
generator or other controller and to compensate for minor adjustment disturb-
ances caused during transportation. Complete adjustment procedures and
other basic checks are described in section 4, and section 5, but only selected
simple procedures should be necessary for initial installation.
2.2 Unpacking
The monitor is normally packaged in a separated shipping container by
MITSUBISHI ELECTRIC CORPORATION.
Open the top of container, then remove the inside packing materials and lift
out the monitor car~fu Ily.
Accessories are placed at the bottom of container, and/or the top of packing
materials.
2.3 Installation Place
· The monitor should be placed away from the device which generates the
magnetic fields, eg. transformer and motor, because the magnetic fields
cause the miss-convergence.
• The sufficient ventilation is necessary for long time stable operation. So,
do not block the vents of cabinet.
· In order to get the excellent display image and prevent eye fatigue, it is
recommended to avoid the direct light shining to the screen of monitor.
7

[ INSTALLATION ]
2.4 Caution before Power ON
Please make sure that wires, components and structures are in perfect mechan-
ical order and not damaged during transportation.
Before turning on the power. switch, check the AC power line voltage and
frequency and make sure that the power line voltage selector inside the cover
in the rear panel is set to the proper position as follows, and the rating of
fuse is identical with the fuse rating label on the rear panel.
Except the Model No. H L7925* KW is setted in the factory before shipment.
Please don't touch the Voltage Selector and Fuse, if you use except
HL7925*KW.
POWER LINE VOLTAGE AC 100"' 120 V AC 220"' 240 V
VOLTAGE SELECTOR Set to 100"' 120V position Set to 220"' 240 V position
MODEL
HL7925*K
FUSE UL/CSA Type
RATING
250V, 3.5A
TYPE Time Delay
How to access the VOLTAGE SELECTOR
COMP
HD · VD
0:~:~
J
/c
~__,_/ -
VOLTAGE SELECTOR inside this cover
8
HL7925*KV HL7925*KW
IEC Type UL/CSA/I
EC Type
250 V, 3.15 A
250V,4A
Time Lag
Time Lag
COMP
HD VD
0:~:0
0
1oov[[J200v
l a l
120 v ill] 240 v
0
Inside View

[ INSTALLATION
2.5 Degaussing
( Degaussing
is required whenever the monitor is installed or moved )
to other place. Degaussing procedure is explained in 3.1 (J).
When it is necessary to degauss the monitor absolutely, it is advised to use a
degaussor.
The procedure of degaussing used by a degaussor is as follows.
( 1) The degaussor should be turned on more than six feet away from the
monitor.
(2) Approach it to the monitor with moving in acircular motion, then move it
around slowly along the screen, top and sides of the monitor a few times.
(3) Take back the degaussor from the monitor gradually with moving in a
circular motion, then turn it off more than six feet away from the monitor.
2.6 Connection of Signal Cables
The signal cable should be made with 75 ohm coaxial cable.
(Type RG59/U or equivalent)
(1) IN CASE OF A COMPOSITE SYNC. SIGNAL
ON GREEN VIDEO SIGNAL
Connect R,G,B video signals to BNC receptacles on rear panel respectively.
Set 2 Kn/HIGH select SW to "2 Kn" position.
15Q R 75Q B 75Q . G
~~
HIGH
~~
HIGH
~~
HIGH
9
COMP
HD
~
2Kn VD
~~
HIGH
HOST COMPUTER
CONTROLLER
PERSONAL COMPUTER
]

[ INSTALLATION]
(2) IN CASE OF COMPOSITE EXT. SYNC. SIGNAL
Connect R,G,B video signals and Composite sync. signal to BNC receptacles
on rear panel respectively.
Set 2
Kn/HIGH select SW to "2 Kn" position.
75!2 R 75!2 B 75!2 G
COMP
HD
2Kn VD
~<i>
HIGH
~<i>
HIGH ·
~<i>
HIGH
<i>
~<i>
HIGH
===I
HOST COMPUTER
CONTROLLER
PERSONAL COMPUTER
(3) IN CASE OF SEPARATE HORIZONTAL AND VERTICAL SYNC.
SIGNALS
Connect R,G,B video signals and horizontal, vertical sync. signals to BNC
receptacles on rear panel respectively.
Set 2
Kn/HIGH select SW to "2 Kn" position.
75!2 R 75!2 B 75!2 G
~~ ~~ ~<i>
HIGH HIGH HIGH ·
TI
COMP
HD
<i>
2Kn VD
~~
HIGH
D
.--~---.I IHOST COMPUTER
-· CONTROLLER
........... =============== PERSONAL COMPUTER
Io I .
10

[INSTALLATION ]
-' -------
(4) IN CASE OF OPERATING MONITORS IN A LOOP THROUGH
STRINGS.
Set the all
of "75n/HIGH" or "2 Kn/HIGH" switches of all monitors,
except the last unit,
with loop through strings to "HIGH" and terminate
the last
monitor to 75n, or 2 Kn.
eoeoeo O!!IO liilOliilOliilO
ogo
~® rn
liilOliilOliilO ogo
~
LJt_j
!-----~~ 's'I
MONITOR CONTROLLER
75Q rml
HIGHIQj
75Q rEil
HIGH~
11
75Q fDl
HIGH~

(3. CONTROLS LOCATION AND DESCRIPTION )
3.1 Under normal operation
FRONT CONTROLS
CD CD POWER ON/OFF SWITCH
-
CZ) POWER ON GREEN INDICATOR
--
@ -0- BRIGHTNESS CONTROL
-@
() CONTRAST CONTROL
l O ID n
...,
10:::-
'-'
I
,~
(]) CD DAGAUSS SWITCH
SIDE
LID CONTROLS
.------- @MODE SWITCH
(OPERATION/ADJUSTMENT)
REAR PANEL CONTROLS
.------- @CHANNEL SWITCH
.-----+- - --t--- --,
@* PICTURE CONTROL
....--------+--~ * ENTRY INDICATOR
'------l--+- - @ * ADJUSTMENT BUTTON
(INCREASE)
'------+---+--@* ADJUSTMENT BUTTON
(DECREASE)
@ * ENTRY SWITCH
((NOTE)) CONTROLS WITH"* "ARE USED
WHEN ADJUSTING THE PICTURE DIMENSIONS .
.-------------- @R INPUT
~ -- ------- @B INPUT
.---------- @G INPUT
.---- +---+---+-- - ;=-::::::-:::-..::-..::-_- ..::: -- @ HD/COMP INPUT
~--+- -- @VD INPUT
o---- +--- ®2 Kn/HIGH SWITCH
,___ ___ __,_ __ ®--+--+-- - @ 75.n/H IGH SWITCH
rarr:
l.!fL~
~~--+--+- - -@vo LT AGE SELECTOR
'-- -t- - ---t===============::::'.'....-- @FUSE
'-------------- @AC INLET
12

[ CONTROLS LOCATION AND DESCRIPTION ]
CD POWER ON/OFF SWITCH
Push the button then the green indicator ® will illuminate and the power
on.
Push the button again then the power off and the green indicator ®
will go off.
@GREEN INDICATOR
The green LED is provided for indicating that the main power supply is
working.
@BRIGHTNESS CONTROL
Turn BRIGHTNESS CONTROL@ clockwise for greater brightness.
@CONTRAST CONTROL
Turn CONTRAST CONTROL @ clockwise for deeper contrast.
<J) DEGAUSS SWITCH
Push the button for a short time to work the degauss circuit. Also this
monitor has an automatic degauss circuit working at every power switched
on.
@ MODE SWITCH
Set OPERATION MODE in normal operation.
SPARE
OFF OPERATION MODE
ON ADJUSTMENT MODE
13

( CONTROLS LOCATION AND DESCRIPTION]
@CHANNEL SWITCH
Select the CHANNEL needed. (See section 2.3)
CHANNEL
CHO
Pre-settable by . user
AUTO
(11 timings)
CHANNEL
CH 1
Pre-settable by user
to
(1 timing for each CH)
CH 7
ENHANCED
CHANNEL
CH 8
VGA 3 modes
CH 9
@ R INPUT
Connect red video signal.
@ B INPUT
Connect blue video signal.
@ G INPUT
Connect green video signal with composite sync. or without composite
sync. signal.
@ HD/COMP INPUT
Connect horizontal sync. signal when using separate external, or composite
sync. signal when using composite external.
(!]) VD INPUT
Connect vertical sync. signal when using separate ext. sync. signal.
14

(_c_o_N_T_R_O_LS_LO_C_A_T_IO_N_A_ND_D_ES_C_R_IP_T_IO_N __ ]
®® 75n/HIGH SWITCH I 2 Kn/HIGH SWITCH
For "Single-Unit" operation, set to "75n" or "2 Kn" pos1t1on. For
"Loop-thru-Strings" operation, set to "HIGH" position for all units except
the last one, and the last one be set at "75n" or "2 Kn" position.
Switch Position
Operation
75n/2KO
HIGH
Single-Unit
YES
NO
YES
Loop-thru-Strings
Last unit
YES
only
NOTE: "T-coupler" must be used for
"Loop-thru-Strings".
@ VOLTAGE SELECTOR (under the cover)
@ FUSE
@ AC INPUT
Connect AC power cord.
15

[ CONTROLS LOCATION AND DESCRIPTION]
3.2 When adjusting the picture dimensions
SIDE LID CONTROLS
.----------@MODE SWITCH
(OPERATION/ADJUSTMENT)
...---r-@ PICTURE CONTROL
r---+---+---+--@ ENTRY INDICATOR
----+-----+--@ADJUSTMENT BUTTON
(INCREASE)
....__----+--+--@ADJUSTMENT BUTTON
(DECREASE)
-----@ ENTRY SWITCH
~---------~~
@ MODE SWITCH
Set
ADJUSTMENT MODE on when you start adjusting the picture dimen-
sions.
1 2
SPARE
OFF OPERATION MODE
ON ADJUSTMENT MODE
16

[CONTROLS LOCATION AND DESCRIPTION
® CHANNEL SWITCH
Select the CHANNEL needed. (See section 2.3.)
CHANNEL
CH 0
Pre-settable by user
AUTO
(11 timings)
CHANNEL .
CH 1
Pre - settable by user
to
CH 7
(1 timing for each CH)
ENHANCED
CHANNEL
CH 8
VGA 3 modes
CH 9
@ PICTURE CONTROL
Select necessary number as you adjust the picture dimensions.
Numbers present following adjustment items.
0
SPARE
1
H-PHASE
2
H-SIZE
3
H-POSITION
Re - adjust these items
according to the
4 V-
POSITION
input signal timing.
5
V-SIZE
6
V-SIZE - FINE
7-9
SPARE
A
PCC-AMP
Re-adjust these items
B
PCC-PHASE
if necessary.
C-F SPARE
17
]

( CONTROLS LOCATION AND DESCRIPTION]
(jJ) ADJUSTMENT BUTTON (INCREASE)
@ ADJUSTMENT BUTTON (DECREASE)
When ADJUSTMENT BUTTON (jJ) or © is pushed, motions of adjust-
ment items
are as follows.
BUTTON@ BUTTON@
WIDEN NARROW
SHIFT TO RIGHT
SHIFT TO LEFT
UP
DOWN
@ ENTRY SWITCH
Push when you make entry of new timing into the internal memory.
(j]) ENTRY INDICATOR
At the entry, if the picture data is memorized, ENTRY INDICATOR ®
is lit for about 0.5 second.
If not, it blinks.
18

[ CONTROLS LOCATION AND DESCRIPTION )
3.3 EXPLANATION ON CHANNEL
CHANNEL must be selected properly when the monitor is normally used, or when
you want to adjust the picture dimensions.
This monitor has 10 CHANNELS and they are classified into two types of
CHANNEL.
CHANNEL
TYPE OF CHANNEL
CH 0
AUTO CHANNEL
CH 1 to CH 9 ENHANCED CHANNEL
Structure of CHANNEL is as follows.
[CHANNEL SWITCH ]
FREQUENCY HORIZONTAL
BAND FREQUENCY
30kHz
1
Pre - settable by user
AUTO
CHO
(11 timings)
CHANNEL
2
CH 1 3
CH 2 4
CH3
Pre-settable by user
5
CH4
[ 1 timing for each J 6
CHANNEL
ENHANCED
CH 5
CHANNEL
7
CH 6 8
CH 7 9
CH 8
VGA Timing
10
CH9
11
I
78kHz
The characteristic for each CHANNEL is shown in the following table.
19