MegaPixel Restore (Work in Progress)

** Warning: CRT's contain lethal voltages. Be aware and cautious. If in doubt don't do it. **

Tools:

Philips screwdriver
nonconductive CRT adjustment tools
Flat screwdriver with grounding clip


Disassembly Steps:
    1) Leave the MegaPixel unpowered and unplugged for 7 days. ( We're being overly cautious here. )

    2) Remove the 4 screws on the back of the MegaPixel. Then pull back on the back plastic cover to remove.
megapixel back

    3) The Adjustment pots should now be visible. The recommended way to adjust the pots is with nonconductive adjustment tools in front of a mirror.
Pot Adjustmentmegapixel_pot_positions

Adjustment
Description
Notes
H.Cent
Sets horizontal display position

H.Hold
Adjusts the horizontal frequency

V.Height
Adjusts vertical size

V.Lin
Adjusts the aspect ratio

Dyn Focus
Adjust the focus on the edges of the screen

V.Cent
Sets vertical display position

Cutoff
Adjusts black level

Focus
Sets primary focus
Square tool ajustment
White Level
Adjusts white level

Width
Adjusts horizontal size



    4) The CRT anode is on the right side. For N4000 monitors there is an access panel on the right side. For N4000A monitors remove the whole top section. 

    5) Clip the grounding clip attached to the flat head screwdriver to the metal frame. Then place the screwdriver under the suction cup of the anode to discharge the CRT. Try to remove the anode gently with the screwdriver.

annode

    6) It is now safe to remove all of the screws around the metal cage. Be careful of the connector attached to the CRT gun. Gently pull back to release. It may take some effort.

    7) The Logic and soundboards are now accessible.

Logic Board


Capacitor List (There can be differences here. I recommend getting extra 22uF 50V caps as these are +/- a few of these depending on the revision):

N4000A Logic Board (Revision: 1-623-855-16 A)
Capacitance Voltage
Tolerance
Temp
Dimensions (mm)
Part #
Quantity
Locations
Notes
1200 uF
35 VDC
20%
105C
12.5 x 31.5 x 5 UPW1V122MHD 1
C33

1 uF
100 VDC
20% 105C 5 x 11 x 2
UVZ2A010MDD1TD
2
C43, C80

1 uF
160 VDC 20% 105C 6.3 x 11 x 2.5
UPW2C010MED
1
C56

100 uF
35 VDC 20% 105C 8 x 11.5 x 3.5
UPW1V101MPD
1
C68

100 uF
100 VDC 20% 105C 10 x 20 x 5
UVZ2A101MPD
1
C5

100 uF
50 VDC 20% 105C 8 x 11.5 x 3.5
UHE1H101MPD
1
C48

1000 uF
35 VDC 20% 105C 12.5 x 25 x 5
UHE1V102MHD
3
C7, C8, C34

330 uF
6.3 VDC 20% 105C 6.3 x 11 x 2.5
UHE0J331MED
1
C24

330 uF
35 VDC 20% 105C 12.5 x 15 x 5
UPM1V331MHD6TO
5
C6, C36, C14, C15, C3

22 uF
100 VDC 20% 105C 6.3 x 11 x 2.5
UVZ2A220MED
5
C2, C62, C37, C11, C17

22 uF
50 VDC 20% 105C 5 x 11 x 2
UPW1H220MDD
6
C202, C44, C35, C1, C70, C31

47 uF 50 VDC 20% 105C 6.3 x 11 x 2.5 UVZ1H470MED
1
C99

22 uF
25 VDC
20%
105C
6.3 x 11 x 2.5
UEP1E220MED
1
C69
Bi-Polar





Total
29



N4000 Logic Board (Revision: 1-623-855-12)
n4000_logicboard
Capacitance Voltage
Tolerance
Temp
Dimensions (mm)
Part #
Quantity
Locations
Notes
1200 uF
35 VDC
20%
105C
12.5 x 31.5 x 5 UPW1V122MHD 1
C33

1 uF
100 VDC
20% 105C 5 x 11 x 2
UVZ2A010MDD1TD
2
C43, C80

1 uF
160 VDC 20% 105C 6.3 x 11 x 2.5
UPW2C010MED
1
C56

100 uF
35 VDC 20% 105C 8 x 11.5 x 3.5
UPW1V101MPD
1
C68

100 uF
100 VDC 20% 105C 10 x 20 x 5
UVZ2A101MPD
1
C5

100 uF
50 VDC 20% 105C 8 x 11.5 x 3.5
UHE1H101MPD
1
C48

1000 uF
35 VDC 20% 105C 12.5 x 25 x 5
UHE1V102MHD
3
C7, C8, C34

330 uF
6.3 VDC 20% 105C 6.3 x 11 x 2.5
UHE0J331MED
1
C24

330 uF
35 VDC 20% 105C 12.5 x 15 x 5
UPM1V331MHD6TO
5
C6, C36, C14, C15, C3

22 uF
100 VDC 20% 105C 6.3 x 11 x 2.5
UVZ2A220MED
5
C2, C62, C37, C11, C17

22 uF
50 VDC 20% 105C 5 x 11 x 2
UPW1H220MDD
6
C202, C44, C35, C1, C70, C31

47 uF 50 VDC 20% 105C 6.3 x 11 x 2.5 UVZ1H470MED
1
C99

22 uF
25 VDC
20%
105C
6.3 x 11 x 2.5
UEP1E220MED
1
C69
Bi-Polar





Total
29





N4000 SoundBoard (Revision: 1-623-854-12)

n4000_soundboard

Capacitance Voltage
Tolerance
Temp
Dimensions (mm)
Part #
Quantity
Locations
Notes
470uF
16 V
20%
105C
11 x 15

2
C140, C141

1000uF
16 V
20%
105C
10 x 20
UPW1C102MPD
2
C145, C144

220uF
25 V
20%
105C
8 x 11.5
UVR1E221MPD
2
C212, C262

22uF
50 V
20%
105C
5 x 11
UPW1H220MDD
2
C220, C270

10uF
50 V
20%
105C
5 x 11
UVZ1H100MDD
8
C143, C256, C203, C269, C221, C271, C219, C146

47uF
16 V
20%
105C
5 x 11
UPW1C470MDD
1
C136

100uF
16 V
20%
105C
7 x 11

1
C135

22uF
16 V
20%
105C
5 x 11
UPW1C220MDD
10
C149, C150. C151. C152, C259, C125, C130, C131, C126, C209






Total
28





N4000A Sound Board (Revision: All)

n400a_soundboard

Capacitance Voltage
Tolerance
Temp
Dimensions (mm)
Part #
Quantity
Locations
Notes
47 uF
16 VDC
20%
85C
1206 - 1.6 x 3.2
C3216X5R1C476M160AB
12
N/A
Ceramic Replacement
1500 uF
16 VDC
20% 105C 10 x 20 x 5
UHV1C152MPD
1
N/A






Total
13