Bang & Olufsen BeoCenter 1, Repair Manual

Page: 412 / 545

Adjustments, English 2.13
#6 Adjustments after replacement of main chassis
Disconnect the ESD mat from the main chassis
- Remove the alligator clip from the aerial input on the main chassis.
Connect the mains voltage
Turn on the TV
- Turn on the TV, with GO . If the screen is black, adjust the 04R485 (SCREEN) to
obtain a picture on the screen. The 04R485 (SCREEN and FOCUS) is located at the
top of PCB4, just to the right of PCB3 seen from behind (see
➢
6).
Set settings for VTR
- A VTR must be used for adjustment to take place.
- If the customer has a video tape recorder (VTR), then this can be used. If not,
another VTR has to be used. If the customer does not have a VTR: Select OPTIONS in
SETUP. Select CONNECTIONS. Set V.TAPE to V.TAPE. Remember to set V.TAPE to
NONE, when adjustment of the TV is fi nished, (not if the customer’s VTR has been
used).
Adjust G2
- Enter SETUP, select SERVICEMODE with STOP , STOP , GO . Push the button
combination within 3 seconds. Select the MONITOR SERVICE MENU then PICTURE
ADJUSTMENTS. Select G2 ADJUSTMENT with GO . Then adjust G2 by means of
04R485 (SCREEN) (see
➢
6). When G2 displays OK, press GO and write down error
messages, if any. Press GO to exit servicemode.
Adjust FOCUS
- Connect the VTR to the TV in the V.TAPE plug using a scart cable. Choose V.TAPE
in display and press GO . Insert the test tape from the back-up suitcase, and press
GO . Now a test picture should be on the screen. If a non B&O or an old B&O VTR is
used, insert the test tape and press play on the VTR or the VTR remote control.
Adjust to optimum focus of the vertical lines as viewed approx. 10 cm/4” from the
edge of the screen, by means of 04R485 (FOCUS) (see
➢
6).
Adjust geometry
- Use the Test-tape as in FOCUS adjustment to check the geometry.
- Remember to check the geometry in format 2 (16:9) as well. Press the DISPLAY
button for approx. 3 seconds. Press
n
untill FORMAT is displayed then press GO .
Press
m
to select FORMAT 2. The geometry of the TV rarely requires adjustment
after replacement of main chassis but if so, the parameters in the following
sections can be adjusted.
These parameters are fi xed and should not be adjusted:
- Vertical S-Correction (V-SC) Must always be set to 20.
- Horizontal sensitivity (EHT) Must always be set to 38.
The adjustments must be done fi rst in format 1 (4:3).