NEC MultiSync 4FGe User manual

MODELS JC-1531 VMA-2(H), (N), (NT), (T)
JC-1531VMB-2 (H), (N), (NT), (T)
JC-1531VMB-2(EE)(H), (EE)(N), (EE)(NT), (EE)(T)
COLOR MONITOR
MultiSync 4FGe
JC-1531 VMR-2(H), (N)
SERVICE MANUAL
PART NO. 599910363
Better Service
Better Reputation
Better Profit
SPECIFICATIONS
- Electrical Description
- Picture Tube
Input
Signal
15” Flat Square CRT, 1200 mm radius
90 degree deflection, 0.28 mm dot pitch
Dot type black matrix, Medium-short persistence
phosphor, Dark bulb, High contrast, Anti-static coating,
lnvar shadow mask.
Video
: Analog 0.7 Vpp 75R Positive
Sync : Separate sync TTL Level
Horizontal sync Positive/Negative
Vertical sync
Positive/Negative
: Composite sync TTL Level
Positive/Negative
: Composite sync on green Video
sync 0.3 Vp-p Negative
(Video 0.7 Vpp Positive)
Display Colors Analog Input : Unlimited colors (Depends on the
graphics Board)
Synchronization Horizontal
: 27 kHz to 62 kHz (Automatically)
Vertical
: 55 Hz to 90 Hz (Automatically)
Resolution Horizontal : 1024 dots
Vertical
: 768 dots (non-interlaced)
Video Band Width 80 MHz
Active Display Area Horizontal : 260 mm Active display area is changed
Vertical : 195 mm by signal timing
Active Display Area Horizontal : 280 mm
(
Fullscan
Vertical : 210mm
Miconvergence Less than 0.5 mm around perimeter less than 0.3
mm at center.
Power Supply JC-1531 VMA-2
AC 120V,60Hz
JC-1531 VMB-2/VMR-2 AC 220 V, 50 Hz
Current Rating
JC-1531VMA-2 1.8 A
JC-1531VMB-2/JC-1531VMB-2(EE)NMR-2 1A
Environmental
Operating Temperature 0°C to +35°C
Considerations
Humidity 30% to 80%
Storage Temperature -20°C to +6O°C
Humidity 10% to 90%
NOTE: The above specifications are subject to change without notice for
further improvement.
NEC Corporation
TOKYO. JAPAN

Introduction to the MultiSync 4FGe color monitor
The MultiSync 4FGe monitor allows you to “plug and play”; the MultiSync technology provides you with automatic
compatibility with multiple operating platforms and a vast array of graphics standards allowing resolution upgrades
without upgrading the monitor.
The larger
15”, high contrast, flatter screen offers improved clarity and enhanced color and image quality.
ColorControl allows you to adjust the colors on your screen to exactly what you want. Thus eliminating
misrepresentations and frustration.
The MultiSync 4FGe monitor strictly follows
ErgoDesign guidelines. ErgoDesign describes a philosophy governing
the design of the MultiSync monitors. The goal of
ErgoDesign is to maximize the comfort and productivity of the end
user.
Feature Highlights
Multiple Frequency Technology
The Multiple Frequency Technology automatically adjust the monitor to the video card’s scanning frequency thus
displaying the resolution you require. The MultiSync 4FGe also supports multiple operating platforms including IBM
compatible and Macintosh family systems.
Increased resolution adds to the image clarity, and the MultiSync 4FGe monitor provides a wider range of higher
resolution to meet your needs for now and in the future.
A wide Range of Graphics Standards is displayable by the MultiSync 4FGe monitor including:
VGA at 640x480 l
60,72 and 75 Hz
Super VGA at
800x600-60 and 72 Hz
MAC II and Quadra at
640x480-67 Hz
MAC II and Quadra at 832x624 l 75Hz
8514/A and XGA at 1024x768 Interlaced
XGA-2 up to 1024 x 768
1024x768 Non-Interlaced 70, 72 and 76 Hz
Screen Technology
A High Contrast Tube with a 0.28 mm dot pitch increases the clarity and displays greater detail. Good clarity allows
your eyes to flow over the screen image and more easily absorb the information.
The Flatter Screen of the MultiSync 4FGe monitor reduces distortion of your image.
Increased Brightness provides higher contrast and more vivid colors.

Mechanical Description
1. Cabinet Molded plastic cabinet with tilt swivel base.
2. Dimensions
^
372 (W) X 396 (H) X 414 (D) mm
372mm
*
3. Tilt Swivel Range
4. Weight
17.8 kg
5. Controls Power Switch
Brightness Control
Contrast Control
Color Switch
Sync Switch
H Size Increase, H Size Decrease
H Position Left, H Position right
V Size Increase, V Size Decrease
V Position Up, V Position Down
Memory Recall Button
Mode Status LED
Degauss Switch
6. Input Signal Terminal Mini D-SUB 15P Connector (MALE)
D-SUB
15P Connector (MALE)
(See page 3 for Pin Assignments Table)
2

Pin Assignment Table
D-SUB INPUT
VGA, 8514/A & XGA Macintosh with Adapter
Pin No.
Mini D-Sub 15P
D-SUB 15P
1
RED
GROUND
2 GREEN
RED
3
BLUE H/V COMP SYNC
4
GROUND GROUND
5 SELF TEST
GREEN.
6 GROUND GROUND
_
7
GROUND
NC
8 GROUND
NC
9
NC BLUE
10
GROUND NC
11
GROUND
GROUND
.-
12 RESERVED NC
__~..~
13 H SYNC GROUND
--
14
V SYNC GROUND
--__
15
NC NC
MINI D-SUB
15P
D-SUB 15P
3

Timing Charts
Separate Sync
Vertical
I
H
.t J
Composite Sync
Horizontal
F
A
1
Vertical
uulr
_________
G
w
4

THE METHOD FOR REMOVING THE TILT SWIVEL BASE
Spindle Revolving
Screw “a”
with Washer
1.
2.
l
FRONT
Turn the monitor CRT face down as
shown. (Top VIEW)
Remove the screw “a” with washer,
then remove the revolving stand from
the display.
Move the revolving stand so that the
“FRONT’ mark is aligned with the
cabinet side.
The removable parts consist of a dis-
play, revolving stand, spindle revolv-
ing, and screw “a” with washer as
shown.
I
Revolving stand

DISASSEMBLY
Cabinet Back
Turn the monitor CRT face down as
shown. (Top VIEW)
Cabinet Bottom
Signal Cable
Cabinet Front
Screw “d”
Remove the three screws “b”.
Remove the CABINET BACK.
3. Place the monitor on its base as
shown.
Remove the four screws
“c” from the
case, shielding (CRT), and remove
the case, shielding (CRT).
4.
ew “c”
Remove the four screws “c” and re-
move the four screws
“d” from the
case, shielding (BACK).
Remove the case, shielding (BACK)
and case, shielding (TOP).

5. Disconnect the connectors “CN-J”,
“CN-L”, “CN-C”, “CN-IN” and “CN-A”.
(from VIDEO PWB ASSY)
Disconnect the connectors “CN-B”,
“CN-HC”, “CN-R”, “CN-G” and
“CN-
M”.(from
CRT PWB ASSY)
Remove the three screws
“c”.
Remove the screw “e”.
Remove the VIDEO PWB ASSY. (with
VIDEO BRACKET)
Screw “c” Screw “e”
-
6. Remove the four screws “c”.
Remove the two screws
“f”.
Remove the screw “k”.
Remove the BRACKET (L).
Screw “f”
Screw
“e
BRACKET
(L)
Screw “k”
Screw “c”
>
Sc
rew “f”
7. Disconnect the connectors “CN-SW”,
“CN-Z”, “CN-D/C” and “CN-K”. (from
the SW REG UNIT)
Remove the screw
“f”.
Remove the screw “k”.
Remove the two screws “d”.
Remove the SW REG BRACKET (R)
ASSY. (with SW REG UNIT)
Screw “k”
8

I
i
;i
.
8. Turn the monitor CRT face down as
shown.
Remove the two screws “d”.
Remove the Anode cap from CRT.
Disconnect the CRT PWB ASSY.
Disconnect the connectors “CN-E”,
“CN-F”, “CN-VDY”, “CN-HDY” and
“CN-K”.
NOTE:
Carefully discharge the CRT anode
cap by shorting it to ground before
removing the anode cap.
9. Remove the three screws “g”.
Remove the MAIN PWB ASSY.
Screw
" "
e,
Screw “g”
BRACKET (BOTTOM)
10.
Screw
“k”
Screw
“i”
Remove the three screws “k”.
Remove the screw “e”.
Remove the screw
"i".
Remove the BRACKET (BOTTOM).

CONTROL PWB ASSY
Spindle Revolving
Cabinet Bottom
Power Line Filter
Signal Cable
SW REG UNIT DISASSEMBLY
CN-K
Cf’fD/C CN-Z
CN-S
1.
2.
Disconnect the connectors TN-K”,
“CN-Z”, "CN-D/C"" and "CN-SW”
Remove the two screws “e” and lift up
the SW REG UNIT.
Screw “e”
10

BOARD LAYOUT
PARTS LOCATION- BOARD LAYOUT
UNIT PWB ASSY
UNIT PWB ASSY
(DISTORTION UNIT) (H OSC UNIT)
MAIN PWB ASSY VIDEO PWB ASSY
CONTROLL
PWB ASSY
BOARDS
MAIN PWB ASSY
PWE-365
VIDEO PWB ASSY
PWE-315A
CRT PWB ASSY PWE-3158
CONTROL PWB ASSY
PWE-318
SW REG UNIT (VMA) SMP-120BB
SW REG UNIT (VMB/R/B (EE)) SMP-12088-l
UNIT PWB ASSY (H OSC UNIT)
PWE-366A
UNIT PWB ASSY (DISTORTION UNIT)
PWE-366B
UNIT 2 (HV PROTECTOR)
-CRT PWB ASSY
SW REG UNIT
UNIT2
(HV PROTECTOR)
(On the MAIN
PWB ASSY)
11

CONNECTORS
CN-D
CN-V DY
CN-K
MAIN PWB ASSY (PWE-365)
CN-F CN-E
CONTROL PWB ASSY (PWE-318)
12
-CN-E
-CN-H
DY
-FBT

CN-A
CN-C
CN-J
CN-L
CN-I
VIDEO PWB ASSY (PWE-315A)
CN-R CN-G
I
CN-B
CN-HC
CN-CE
CN-M
CRT PWB ASSY (PWE3158)
13

SW REG PWB ASSY (VMA)
CN-SW CN-Z
CN-D/C CN-K
SW REG PWB ASSY (VMB/R/B(EE))
14

ADJUSTMENT CONTROLS LAYOUT
’ 0
UR854 (2.85V ADJ)
c
cl
VR851 (0.96V ADJ)
cl
-
cl
VR852 (OV ADJ)
II II
UR403 (SIDEPIN)
\
\
VR401 (V SuB HEIGHT)
VR503 (H SIZE)
0 -
cl
VR402(V LINER)
o-
, VR431 (PARALLELO ADJ)
n,
\ VR404 (TRAP ADJ)
1
\
\
I
UNIT PWB ASSY(PWB-366B)
/",-
UNIT PWB ASSY(PWB-366A)
(DISTORTION UNIT)
(H OSC UNIT)
/
/
VR551 (6V ADJ)
VR505
(HV ADJ)
UNIT 2 (HV PRORECTOR)
I
MAIN PWB ASSY(PWE-365)
TP-AUTO TEST PIN ASSIGNMENT
0103050709 0 000 17
020406080100 000 18
PIN NO
1 MEMORY RECALL 10 NC
2 AUTO ADJUSTMENT PULSE OUT 11 CONTROL DOWN
:
CONTROL SELECT O(H S)
12 USER LEVEL ID
TEST POINT TP-3
13 CONTROL UP
5
CONTROL SELECT l(H P)
14 COLOR N
;
TEST POINT TP-2
15 +5v
CONTROL SELECT 2(VV S) 16 COLOR 1
8 TEST POINT TP-1 17 GND
9 CONTROL SELECT 3(V P) 18 COLOR 2
Ill09 8 7 6 5 4 3 2 1
TP-A
00000000000
PIN NOTEST POINT TP-1
: TEST POINT TP-2
7 H V PROTECTOR (10)
8 H V PROTECTOR (8)
3
+ 5v
9 H SYNC OFF
4
TEST POINT TP-3
10 Ov ADJ
H V PROTECTOR (9)
; H V PROTECTOR (7)
11 GND
6 5 4 3 2 1
TP-B
000000
PIN NO
: GND
2.85v ADJ
3 5.14v ADJ
: &%F~D:NO VERTICAL HEIGHT)
6 CUT OFF (FAINT ADJUST)
15
TP AUTO
-TP-A
-_
VR502(H HOLD 2)
VR501(H HOLD 1)
_--FOCUS,
-SCREEN

CN-TP
VR710 (SUB BIAS)
0
VR707 (R SUB BRIGHT)
0
VR705 (G BIAS)//
VR706
(B BIAS)
VR701 (R GAIN)
0
n
VR702 (G GAIN) ---"--
:
VR703 (B GAIN)/
VIDEO PWB ASSY(PWE-315A)
TP903 (B)
TP901 (R)
TP905 (GND)
\
\
‘a
\
0 0
TP902 (G)
l <
-,TP904 (SCREEN)
CRT PWB ASSY(PWE-315B)
16

ADJUSTSMENT PROCEDURE
,
See page 26 for j i g
Standard Adjustment Conditions
1) Power source voltage:JC-1531VMA-2 AC120V6OHz/JC-1531VMB-2,R-~,
B-2(EE)
AC220V50
1.
1)
2)
3)
4)
5)
2) Aging :Ad_iust after leaving
3) Signal:
Video
Synchronizing
:
Deflection frequency :
Analog 0.7Vp-p 75Q terminal positive polarity
Analog sync on green
Video
: 0.7Vp-p
Synchronizing : 0. 3Vp-p
TTL level Negative/positive polarity
Separate/composite
H 27kHz~62kHz
V 55Hz~90Hz
Pre-Adjustment of MAIN PWB
power on for a minimum twenty minutes.
NOTE: The following 5 steps are to be performed only when the MAIN PWB is
replaced.
VR Settings
VR501 H HOLD 1 :
Fully clockwise
VR502 H HOLD 2 :
Fully clockwise
VR503 H SIZE :
Fully counterclockwise
VR431 PARALLEL0 ADJ: Mechanical center
Heater Voltage Adjustment
a) Receive character "H".
Signal 9 (1024X768(70))
b) Supply 24V to the MAIN PWB.
c) Adjust VR551 so that the voltage across HC @ and @ is 6.1V ±O.O5V.
H V Adjustment
Signal 11 (42.5kHz)
a)
b)
c)
d)
e)
f)
g)
h)
Connect CNP-HV
Turn
VR505(H V ADJ VR) fully counterclockwise.
Receive crosshatched pattern and adjust VR501(H HOLD 1) and VR502
(H HOLD 2) to sychronize the screen.
Brightness control: Fully counterclockwise
Contrast control
:
Fully counterclockwise
Receive an all-black signal.
Confirm that the CRT is at cut-off.
Adjust VR505 so that high voltage is 24kV ±O.lkV.
Seal VR505 by using a cap(74102801) and silicon glue.
Reference Voltage Adjustmant
a) Supply 24V to the MAIN PWB.
b) Adjust VR851(0.96V ADJ) so that the voltage across TP42 and GND on
Adjustment-PWB (TP-B
@ and @I> 0.96V ±O.OlV.
OV Adjust Signal 10
a) Receive signal lO(all "H").
b) Adjust VR852(5.14 ADJ)
so that the voltage across TP-A @I and @ is OV
±0.05V.
17

See page 26 for jig
2.Main Adjustment
Service adjustment
* Set the user switch positions as follows unless otherwise instructed.
CONTRAST VR : Fully clockwise
BRIGHTNESS VR: Adjust to the point where the back raster just disappears
COLOR SW
: Far on your left (position “N”)
SYNC SW
: Left side (off)
(LED)
SW105
SW1 07
D118
SW102
“&R q
SW1 08
q ; :,::” 1 %,, q
SW111 SW112
SWllO
F A 0: OON
LEVEL MEMORY SW106 SW108
MANUAL COLOR
SYNC
ID RECALL
SIZE POSITION
DEGAUSS
Switch inside the front door
* The user level 1 LED indicators the level as follows
LEVEL 1
: Turn off
LEVEL 2
: Turn on
LEVEL 3
: Turn on and off
Unless otherwise
instructed, set the user level to level 1.
* Changing the user level
To LEVEL 1 : Simultaneously press
DEGALlSS(SW110) and V POS UP(SW107)
To LEVEL 2 : Simultaneously press DEGAUSS(SW110) and H POS RIGHT(SW103)
To LEVEL 3 : Simultaneously press DEGAUSS(SW110) and V POS DOWN(SW108)
* User switch functions
a) LEVEL 1
(POSITION,SIZE)
V SIZE UP v
POSI UP
I
H POSI
LEFT 0 H ‘~SLHT
I 0 I I
I 0
MEMORY H SIZE
RECALL
DOWN
1 H SIZE
UP
0
MANUAL
DEGAUSS
V SIZE DOWN
V POS DOWN
b) LEVEL 2 (INTENSITY, SIDE PIN)
G INT DOWN
0
G INT UP
R INT
UP
0
B INT
UP
MEMORY
R INT
RECALL
DOWN n ’ %N
0
MANUAL
DEGAUSS
SIDE PlN(PIN)
SIDE PIN(BARREL)
c) LEVEL 3 (SUB-BRIGHT)
G SBBRT DOWN
G SBBRT UP
I
R SBBRT
Up 0 B sBB;;
0 I
0 0
I 0
MEMORY R SBBRT
RECALL DOWN n B ;;:zT
0
MANUAL
DEGAUSS
NON NON
d) VR503: H SIZE Fully clockwise
* Adjustment jig
Set
all switches at “Open” position.
Connect TP-A and TP-B to Adjustment jig.
18

(2-l) MAIN PWB ADJUSTMENT
(1)
(2)
(3)
(4)
(5)
Signal 1 (VGA350)
Horizontal Hold
Signal 10 (1024X768(76))
Receive signal lO(all "H").
(a)
(b)
(c)
(d)
[F-i
(g)
Adjust VR852(5.14V ADJ) so that the voltage across TP43 and
GND on Adjustment jig (TP-A
@I and 0) is OV ±O.O5V.
Short SW46 on Adjusting jig (TP-A @ and @> and adjust VR501
(H HOLD 1) so that there is one screen.
Open SW46 on Adjusting jig (TP-A @ and 0) and check for
synchronization.
Receive signal lO(all "H").
Short SW46 on Adjustment jig (TP-A @I and 0) and adjust VR502
(H HOLD 2) so that there one screen.
Open SW46 on Adjustment jig (TP-A
@I and 0) and check for
synchronization.
Horizontal Raster Centering
Signal 12 (1024X768(76))
(a) Receive an all-black signal.
(b) If necessary, adjust the brightness control so that the raster is
faintly illuminated.
(c) If necessary, press the user control switch(SW101) and compress
the amplitude until both edges of the horizontal raster can be
seen. (Adjust the HORIZONTAL RASTEP size about 27Omm)
(d) Adjust VR552 so that the raster is within the following limits
space between bezel and raster right and left space difference
±2mm.
Vertical Linearity Signal 6 (800x600(56))
Perform this procedure only necessary.If needed:
(a) Receive a crosshatch pattern.
(b) Adjust VR401(V SUB HEIGHT) so that the vertical screen size is
approximately
195mm.
(c) Adjust VR402(V LIN) to obtain the best vertical linearity.
Vertical Sub Height
Signal 1 (VGA350)
(a) Receive a crosshatch pattern.
(b) Adjust the user control V POS switches(SW107/108) to center the
vertical screen position.
(c) Use the V SIZE switches(SW105/106) to increase the vertical
screen size to the maximum size.
(d) Adjust VR401(V SUB HEIGHT) so that the top and bottom horizontal
lines of the crosshatch pattern just meet the front bezel.
Side Pin
Signal 6 (800x600(56))
(a) Turn the VR431 mechanical center.
(b) Receive a crosshatch pattern (with outside border).
(c) Adjust th e user control switches (SW101,102,105,and 106) to obtain
the following picture size.
Vertical: approx. 195mm
Horizontal: approx. 260mm
(d) Short SW43
on Adjustment j ig.(TP-A @ and @>
(e) Push MEMORY RECALL SWITCH(SW109) for at least 2 seconds.
(f) Release the short.
(g) Adjust VR403 so that the vertical lines at left and right edges
of the screen are straight.
19