Adjustments, English; Geometry Adjustments - Bang & Olufsen 8660 Centro De Servicio Guía De Reparación

9.17

Adjustments, English

ADJUSTMENTS

Geometry adjustments

Only items that are not described chapter 5 and 8 are described in this chapter.
Please refer to page 9.16 for an overview of the Service Mode menus.
For operation in Service Mode see page 5-2.
Important!
When replacing the electrical chassis including PCB1 AV signal processing, PCB3
Video output, PCB4 Power supply & defl ection and PCB6 Main microcomputer, to
avoid loss of data the old EEPROM 6IC6 must be moved to the new PCB6.
At the bottom left-hand corner of PCB1, AV signal processing, there is a small
label where the adjustment values for TUNER TAKEOVER, IF ADJUST and FM
SOUND ADJUST are written. These values must be written into the old EEPROM.
When replacing PCB6 the old EEPROM 6IC6 also must be moved to the new
PCB6.
For geometry adjustments a standard 4:3 test pattern (e.g. Philips) should be used.
Geometry adjustments have to be done in format 1 (4:3) and format 2 (16:9).
Operation
- Select a SETUP menu.
- Press STOP STOP GO within 3 seconds on Beo1 to get access to SERVICE MENU.
- Select MONITOR and select GEOMETRY ADJUSTMENTS.
- Select the parameter to change and press GO. Change the parameter setting with
l n. Press
and GO when the parameter setting is ok.
Some of the adjustments are fi xed and should not be adjusted:
Vertical S-Correction (V-SC)
Horizontal sensitivity (EHT)
The adjustments must be done fi rst in format 1 (4:3).
- Enter Service Mode and select the MONITOR line.
- Select the PICTURE ADJUSTMENTS line.
- Select the BRILLIANCE line and set the brilliance to max. (62).
Then press GO.
- Select the GEOMETRY ADJUSTMENTS line.
- Select the BOW (Horizontal BOW) line and set it to 8.
- Select the H-AM (Horizontal AMplitude) line and adjust until the phosphor edge is
visible at both sides of the picture. Select the H-CT (Horizontal CenTering) line and
adjust to one of the three positions that gives the best centering of the picture.
Select the H-AM line and adjust to correct picture width. Then press GO and
select the PICTURE ADJUSTMENTS line.
Select the BRILLIANCE line and set the value to the same as before the adjustment.
Then press GO.
- Select the GEOMETRY ADJUSTMENTS line.
Must always be set to 20
Must always be set to 38
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