Adjustment Guide - Bang & Olufsen BeoVision Avant 32 DVD MKI Manual De Reparacion Y Servicios

5.4 Adjustments, English

ADJUSTMENT GUIDE

Initial settings in order to adjust BeoVision Avant 32 DVD
Horisontal centre adjustment
G2 (cut off) adjustment
Adjustment with an oscilloscope (recommended)
Adjustment with a multi-meter (Ri > 1 Mohm)
- Remove AV-plug from the AV Scart socket, if any connected.
- Enter SETUP and select CONNECTIONS. Set V.TAPE for V.TAPE. Press GO and then
EXIT to leave the menu.
- Ensure that the TV is in format 3 (16:9), press LIST (until FORMAT) + 3.
- Remember to reconnect when adjustment is fi nished.
A standard colour test pattern must be connected when making the following
adjustments unless otherwise specifi ed.
Horisontal centre switch 5S1 (placed in coordinate 7E) must be adjusted to the
position left, centre or right. See
- Press V.TAPE. The screen should go black. Enter SETUP and select PICTURE. Adjust
BRILLIANCE to maximum value (62). Press EXIT.
- Adjust the switch 5S1 until the best centring is achieved.
Ensure that the switch is in the "click" and not between two positions.
In order to ensure the right G2 voltage for the picture tube, this must be measured
and adjusted if necessary.
Cover the entire display panel with e.g. a soft cloth to prevent sunlight from
adjusting the contrast. Remove this cover when G2-adjustment is done.
- Press V.TAPE. The screen should go black. Enter SETUP and select PICTURE. Adjust
BRILLIANCE to 32 and CONTRAST to 44 which are the nominal values. Press EXIT.
- Connect the ground lead from the oscilloscope to GROUND on PCB3.
Measure with the oscilloscope on the cathode of 3D102. Read out the value of
the pulse. Repeat this on 3D202 and 3D302. See
- Notice which test point has the highest voltage and place the probe on this.
Adjust by means of the G2 (SCREEN) potentiometer until the pulse is 148V ±3V DC
(absolut maximum).
X=2mS DIV Y=50V DIV
- Set the multi-meter in a DC-voltage area of minimum 200 V.
- Place the black lead from the multi-meter on GROUND on PCB3.
Place the red lead from the multi-meter on the cathode of 3D102. Read out the
value on the multi-meter. Repeat this on 3D202 and 3D302.
- Notice which test point has the highest DC-voltage and place the red lead on this.
Adjust the voltage to approx. 167V DC by means of the G2 (SCREEN)
potentiometer.
1.
148V ±3V
0V
2.