Bang & Olufsen Type 2651 Service Manual page 64

Bang &Olufsen
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REPAIR TIPS, ENGLISH
C A
1 7 i '
Presetting of EEPROM
Continuous operation of tape
recorder
Speaker sound level adjustment
CD test
- Bring the product into TEST MODE.
- Press 07.
Display: 07. Flashes while presetting.
The preset programmes are deleted.
Volume - 30; balance, bass and treble in neutral; loudness on.
Noise reduction on.
Autoreverse on.
Speaker sound level adjustment is not affected.
- Disconnect the mains voltage when the preset procedure has been
completed.
- Bring the product into TEST MODE.
- Press TAPE.
- Press 38.
The tape recorder plays continuously, i.e. 30 secs. on side 2,30 secs. on side
1 etc., until 37 is pressed.
To be performed when replacing PCB 3 Microprocessor, 31C4, PCB 2 Amplifier
or a speaker unit. See section 5 for adjustment procedure.
- B ri n g t h e p ro d uc t i n t o T E S T M O D E .
- Press CD. The following error messages will be displayed in test mode
when playing a CD (disc without errors, part No. 3634031):
D i sp l a y:
2: Focus error.
H a s a C D b e e n l o a d e d ?
Does the laser switch on? LO 81C7800-17.
Does the FE output regulate? FE 81C7800-15.
D o e s t h e fo cu s m o t o r re g u l a t e ? F O C + 8 P 1 8 0 1 - l / F O C - 8 P 1 8 0 1 - 2 .
3 : R a d i a l e rro r.
Does the RAD output regulate? RAD 81C7802-15.
D o e s t h e r a d i a l m o t o r r e g u l a te ? R A D + 8 P 1 8 0 1 - 4 / RA D - 8 P 1 8 0 1 - 3 .
4: Turntable motor error.
Does the PWMA output regulate? PWMA 81C7841-28.
Does the turntable motor receive DC voltage? TTM+ 8P1842-1lTTM-
8P1842-2.
5: TL is low for more than 50 msec.
C h e ck T L 8 1 C 7 8 0 0 -1 1 .
6: Jump/Step error.
Check eyepattern. HF 8C2843, test point 3.
Check data transmission. R/A, DATA and CLK 81C7881-1111019.
7: Subcode error, no subcode within 3 secs.
Check data transmission.
8: TOC error. Outside the "lead in" area while TOC (program content) is
b e i n g re a d .
Check laser arm mechanics.
30: Communication error between PCB 3 Microcomputer and Servo
microprocessor.
Check data transmission. Master/Slave 81C7881-27 128.
Remove the CD if you
Press 40.
Laser switches on, and focus is searched for (focus is searched
for every time 40 is pressed).
Press 42. Turntable motor starts, and the laser switches on and goes into
starting position.
Press 43. Turntable motor stops, and the laser switches off and goes into
Press 44.
Laser arm moves towards extreme outside position.
Press 45. Laser arm moves towards the centre.