Philips MC-M250 Service Manual page 26

CIRCUIT DIAGRAM - COMBI BOARD (Part 1)
1550 A1 2501 B11 2510 F10 2518 F12 2526 G15
1551 B1 2502 B11 2511 D11 2519 E13 2527 B15
1552 B2 2503 F15 2512 G11 2520 F13 2528 I15
1553 D2 2505 C9 2513 C12 2521 C14 2529 C16
1554 D2 2506 E9 2514 H12 2522 H14 2530 H16
1555 F2 2507 C10 2515 E12 2523 C14 2531 C15
1556 G2 2508 E10 2516 F12 2524 G14 2532 H15
2500 A9 2509 C10 2517 E12 2525 D15 2533 C16
1 2
COMBI BOARD
Source Selection / Sound Control part
2550
22n
2551
A
1550
4
2n2
T551 3551
2
33K
T552 3552
1
AUX
33K
3 2552
2n2
2553
B
22n
1551
T553
-CMOS
-8V2
7
T556 3556
TAPE_R
6
6K8
9551
+12V
+12V_AF
5
T554 3555
TAPE_L
4 T555
6K8
C GND
3 REC_R
T558
REC_R
from
2
T557
3585, 3586
REC_L
1
REC_L
FE-BT-VK-N
1553
T559
9553
+Motor
+12V
2
GND
D
1
EH-B
1554
T561 3557
1
CD_L
2
GND
T562 3558
3
CD_R
4
E +5V CD_+5
T563
5
GND
6
+SERVO +CD_MTF_MOTOR
T564
FE-BT-VK-N
1555
T565 3561
1
LEFT
10K T567
2
F GND
T566 3562
3
RIGHT
10K
4 T568
VCC
5 T569
TU_EN / MPX
6 T570
TU_DATA
7 T571
TU_CLK
8
T572
G /STEREO
FE-BT-VK-N
1556
T573 +5V6_S
+RDS
16
TU_EN / MPX
15
TU_DATA
14
TU_CLK
H
13
/STEREO
12
0.5V 3.4V
T574 3.4V
BKLT_ON
11
0V 0V
T575
AU_STR
10 0V 0V
T576
AU_DATA
9
0V 0V
T577
AU_CLK
8
3.3V 0V
T578
I MUTE
7
T579
PWM
6
D_GND
5
T580
+5V6 +5V6
4
T581
/PWRDWN
3
T582
/BKLT
2
J +A
+12V
1
T583
FE-BT-VK-N
PWRDWN
from
Supply Part
1 2
11 - 1
2534 H16 2557 H7 2566 D7 3501 B10 3510 F10 3518 F13
2535 B9 2558 J7 2567 B7 3502 B11 3511 D12 3519 E14
2550 A2 2559 J7 2568 D7 3503 B12 3512 G12 3520 F14
2551 A2 2560 J7 2569 B8 3505 D9 3513 E12 3521 E14
2552 B2 2561 G6 2570 D8 3506 F9 3514 F12 3522 F14
2553 B1 2563 B6 2571 G8 3507 C10 3515 E13 3523 D14
2554 H5 2564 D6 2573 A5 3508 E10 3516 F13 3524 G14
2555 I3 2565 B7 3500 A8 3509 D10 3517 E13 3525 B13
3 4 5 6
SOURCE SELECTOR
+VS
from 7552
A1 A0
2573
16 9 10
100n
VDD
MSB LSB
LOGIC
7551
3579
3554 3553
150K
HEF4052BP
8K2 8K2
3577 0.54V
4.35V
TAPE_L 1 LL 470R
2565
TUNER_L 5
LH H 2563
470n
AUX_L HL L
CD_L 4
HH
3575
15K
TAPE_R 12
LL
3576
TUNER_R 14 LH H
15K
AUX_R 15 13
HL L
CD_R 11 HH
2564
470n 3580
VSS VEE
150K 4.2V
8 7 6 3578 0.54V
4.35V
T550 470R
2566
18K
Source Selection
Logic Table
Source A1 A0
18K
3559 3560
TAPE 0 0
2K7 2K7
AUX 1 0
TUNER 0 1
CD 1 1
9554
(forseen only)
5550 to 1551 or 1552
470n
5551
7553
+12V_AF 5.27V
470n
0V 0V BC327-40
CD_+5
9555 (forseen only)
3574
47K
4.65V
5.5V
CD on = Low
4.9V
5.7V
5V
2561
0.55V T585
3563
+5V6_S +VS 22u
100R
2554
220u
STANDBY
0V
0V
0V
MUTE
0V
0V 4.9V
4.9V
2.8V
PWM
2555
to 6500 0V 2.8V 3568
7550
2u2
+12V
BC817-25
1K5
2.2V
T584
0V
BACKLIGHT
2.2V
3565
15R 6550
BZX79-C2V7
3566
15R
3 4 5 6
(230V MAINS SUPPLY ) DC VOLTAGES MEASURED IN :
CD Mode 1KHz , 0dB track, DSC "OPTIMAL", DBB "OFF", INCR "OFF", VOLUME "20"
V
V
Tuner Mode 1KHz , df "22.5kHz", DSC "OPTIMAL", DBB "OFF", INCR "OFF", VOLUME "20"
V
Standby Mode
V DSC OFF/ON at CD Mode 1KHz , 0dB track, VOLUME"20"
3526 I13 3534 G15 3542 J16 3552 A3 3560 E4 3573 I9
3527 B14 3535 C15 3543 B16 3553 B3 3561 F2 3574 G7
3528 I14 3536 G15 3544 I16 3554 B3 3562 F2 3575 C6
3529 C14 3537 A15 3545 C16 3555 C3 3563 G4 3576 C6
3530 H14 3538 J16 3546 H15 3556 B3 3565 J4 3577 B6
3531 C14 3539 B16 3547 B17 3557 D3 3566 J4 3578 D6
3532 G14 3540 I16 3548 I17 3558 E3 3568 I5 3579 B7
3533 C15 3541 A16 3551 A3 3559 E4 3572 H8 3580 D7
7 8 9 10
ELECTRONIC VOLUME CONTRO L
+VS
4.2V
3500 T500 0.57V
4.1V
Vc to 7500 pin 14
820R
+VS
2500
100u
3501
4.2V
470R
7555
BC847B
2569
2567 3587
4.05V
4.1V
3K9
100p 2u2 1u T595 T501
0.57V
0V 3.6V 3583
3.75V 4K7
2505 2507
3581
3.55V
2K7 0V
100p 100p
0V
3.6V
3585
2K2
7501 3507 7503
ON4986 ON4986
15R
3.55V
0V 3.55V
0.2V
3.6V
3.6V
2509 0V T503
+VS
0.2V
22p
3505 3509
33K 33K
7556
BC847B
2570
2568
3588
3K9
100p 1u T596
2u2
0V 3.6V 3584
3.75V 4K7
2506 2508
3582
3.55V
2K7
100p 100p
0V
3586 0V
3.6V
2K2
3508 7504
7502
ON4986 ON4986
15R
3.55V
0V
3.55V 0.2V
3.6V
3.6V 2510 0V T504
0.2V
REC_R
22p
3506 3510
REC_L
33K
33K
+5V6
5.35V
5.5V
3589 5.7V 2571
+5V6
220R
470n
5.5V
T586
5.7V
5.35V 3572
7552
10K
16
2557 HEF4094BP
470n SRG8
15
EN1
uP Port Extension
1
STB
3
LOGIC TABLE
0/5.5V T587
2 4
Sound features
D 1 JAZZ
0/5.5V T588
5
DSC DBB
POP
6 0/5.5V T589
INCR off
off
T590
7 0/5.5V
(flat)
BASS on
5.7V 5.5V T591 3573
14 0.67V CD
off
Rock
0/5.5V T592 1K
13
DBB on
0V 5.5V 5.35V
12 T593
A0 off
to Source Sel. Jazz
0V T594 0V 5.35V
11
7554
A1 on
2559 2560 9
2558
off
220p 220p Pop
220p
10
on
8
7 8 9 10
11 - 1
3581 C7 3589 G8 7500-D D15 7506 F14 7514 I15 9553 D2 T551 A2
3582 E7 5550 F3 7500-E D13 7507 B13 7550 I4 9554 F3 T552 A2
3583 B8 5551 F3 7500-F D11 7508 I13 7551 B5 9555 G3 T553 B2
3584 E8 6500 B12 7501 C9 7509 D13 7552 H8 T500 A9 T554 C2
3585 C8 6550 J5 7502 E9 7510 H13 7553 F6 T501 B10 T555 C2
3586 E8 7500-A G11 7503 C10 7511 A15 7555 B7 T503 C11 T556 B2
3587 B8 7500-B G13 7504 E10 7512 I15 7556 D7 T504 F11 T557 C2
3588 D8 7500-C G15 7505 D14 7513 B15 9551 C2 T550 D5 T558 C2
11 12 13 14
D IGITAL SOUND CONTROL (DSC )
POP JAZZ
2501
220u
PWM
3502 3503 6500
3525 3527
2K2 470R from 1556
1N4148
220K 220K
2502
7507
10u 0/2.65V
BC847B
2521 3529
0/2.1V 27K
1n5
0/2.65V
2513
0/2.1V
2523 3531 3533
47p
7509
3511 680p 27K 33K
BC847B
100K
2.05V
Vc
1V
14
12
2511 2.05V 3523
13 Vc 2.05V
220n 7500-E 33K
7
0V
BC847B
HEF4069UBP
7500-F HEF4069UBP
2.05V
14 7505
HEF4069UBP 2515 3513 2.08/2.1V
2.05V 11 10
0V
15K
10n
2.05V 7
2517
3515 3517
0/2.64V
33K 100K
1n5
3519 3521
2519
220K 33K
220p
INCR
2520
3520
3522
220K
220p
33K
2518
3516 3518
0/2.64V
33K
1n5 Vc 100K
2.05V
Vc 14
2516 3514 0V
3 4
2.05V
7506
2.08/2.1V
10n 15K 2.05V
7500-A 7500-B
7 BC847B
0V
HEF4069UBP
HEF4069UBP
14 2.05V
2512 3524
2 2.05V
1
1V 33K
220n
7
2.05V
3512
0/2.1V 2524 3532 3534
100K
27K 33K
680p
2514
BC847B
47p 0/2.65V
7510
2522 3530
0/2.1V
27K
1n5
BC847B
0/2.65V
7508
3526 3528
Control lines 220K 220K
DBB POP BASS JAZZ
0 0 1 0
1 0 1 0
POP JAZZ
0 0 0 0
1 0 0 0
0 0 1 1
1 0 1 1
0 1 0 1
1 1 0 1
11 12 13 14
T559 D2 T568 F3 T576 I2 T584 J4 T592 J9
T561 D2 T569 F2 T577 I2 T585 G5 T593 J9
T562 E2 T570 G2 T578 I2 T586 H8 T594 J9
T563 E2 T571 G2 T579 I2 T587 I9 T595 B8
T564 E2 T572 G2 T580 I2 T588 I9 T596 E8
T565 F2 T573 G2 T581 J2 T589 I9
T566 F2 T574 H2 T582 J2 T590 I9
T567 F3 T575 H2 T583 J2 T591 I9
15 16 17
BASS DBB
A
3537
220K
BC847B 0/2.9V 3541
7511 150K
2/2.36V
2527 3539
10n 22K
B
BASS_ALC
7513 -0.3/0.56V 3547
BC847B
150K
from
3543
Amplifier Part
82K
2529
100n
3545
8K2 C
2531 2533
100n 47n
3535
100K
2525
Vc
47p
2.13V
D
14
1.1V L
9 8 2.1V
to
7500-D
7
Amplifier Part
E
F
Vc
2503
7500-C 22n
HEF4069UBP
14
R
6 2.1V
5
to
1.1V
7 G
Amplifier Part
2.13V
2526
47p
3536
100K
2532 2534
100n 47n
H
3546
8K2
2530
100n
3544
82K
BASS_ALC
3548
7514
-0.3/0.56V 150K
from I
BC847B
Amplifier Part
BC847B
2528 7512 3540
10n 22K
2/2.36V
3542
0/2.9V
150K
J
3538
220K
BASS DBB
15 16 17