Sony KE-42M1 / KE-MV42A1 / KE-MV42M1 / KE-P42M1 Service Manual ▷ View online
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1) Install the X-Main and Y-Main Ass'y boards onto the Chassis Base as shown in the
figure on the previous page, using the following specified screws.
Board
Screw
Number of screws
X-MAIN
M3 x L10
8
Y-MAIN
M3 x L10
7
Y-BUFFER
M3 x L10
10
2) The securing order is as follows: (1) center of each Main Board Ass'y, (2) right and left
of the Main Board Ass'y, and (3) others.
(The order depends on the alignment of the Chassis Base and the Main Board Ass'y.)
2) Tighten securely the screws on each Main Board Ass'y using the electric screwdriver.
5-4-4. Installing the Logic PCB Ass'y board on the Chassis Base
LOGIC MAIN
ASSYBOAR
ASSYBOAR
D
Chassis Base
F Type
Chassis Base
F Type
LOGIC MAIN
ASSY BOARD
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1) Install the Logic Main Board Ass'y onto the Chassis Base as shown in the figure on
the previous page, using the following specified screws.
Board
Screw
Number of screws
LOGIC BOARD
M3 x L10
7
2) The securing order is as follows: (1) center of the Logic Main Board Ass'y, (2) right
and left of the Logic Main Board Ass'y, and (3) others.
(The order depends on the alignment of the Chassis Base and the Logic Main Board
Ass'y.)
3) Tighten securely the screws on the Logic Main Board Ass'y using the electric
screwdriver.
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6. Operation Checks After Repair Service
6-1. Check
Items
xxxxx
Check Item
Specification
Remarks
TCP
Drive board
Y Buffer
Logic and Logic Buffer
Securely connected or tightened
Harness
Securely connected
Module
assemble check
Foreign materials
No foreign materials
6-2. Check
Procedure
1) Check visually the following: (1) the module is correctly assembled, (2) the
connections have no problem, and (3) the grounding and easily short-circuited parts
are not damaged.
2) Check that the dip switch is inside the module.
3) Turn on the power of the PDP module, and check that the LED lights up and the unit
correctly functions.
4) Check the power voltages, and also check the display condition by tapping slightly the
Y-FPC several times.
5) Check that Full White pattern is normal.
6) If the pattern is abnormal, adjust each voltage using the multi-meter and adjustment
tools.
7) Adjust the waveforms using the oscilloscope.
8) Display each pattern image to check the discharge on the screen.
9) Vary video level of input signal and make sure image is displayed correctly without
any problems.
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7. Adjustment Procedure
7-1. Adjustment Spec. and locations
TCP Ramp Curve adjustment (Y-Board)
7-2. Procedure
1) Provide Full White pattern signal.
(Change Dip SW from internal to external, as shown in Appendix 3.)
2) Set positive probe of Multi-meter to “Vsch” and negative probe to the ground. See
appendix 2.
Vary VR5004 and set 40 volts +/- 1.0 volt.
3) Use an Oscilloscope and display a waveform at test point (Out4) on Y-Buffer board.
Control Trigger and hold the waveform.
(Use V_TOGG on Logic board or V-Sync on B-bd as triggering source is one of idea.)
Adjust controls and set “1 TV field” to proper horizontal size on screen.
Adjust horizontal controls and pick up “1
st
Sub-Field”, as shown in appendix 1.
2’nd sub-field
3’rd sub-field
1’st sub-field
Vset Adjustment:
10 uSec +/- 1 uSec by VR5002
30 u Sec +/- 1 u Sec by VR5003
(In 3
rd
Sub field)
30 u Sec +/- 1 u Sec by VR5001
Vsch Adjustment:
40 volts +/- 1 volt by VR5004
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