Procedure; Adjustment Procedure; Adjustment Spec. And Locations - Sony KE-42M1 Service Manual

7. Adjustment Procedure

7-1. Adjustment Spec. and locations

TCP Ramp Curve adjustment (Y-Board)
Vset Adjustment:
10 uSec +/- 1 uSec by VR5002
30 u Sec +/- 1 u Sec by VR5003

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
1'st sub-field
- 39 -
2'nd sub-field
Vsch Adjustment:
40 volts +/- 1 volt by VR5004
(In 3
30 u Sec +/- 1 u Sec by VR5001
st
Sub-Field", as shown in appendix 1.
3'rd sub-field
rd
Sub field)