Philips MC-20 Service Manual page 18

COMBI BOARD (Part 1) - CIRCUIT DIAGARM
1550 A1 2501 B10 2510 E9 2518 E11 2526 F13 2534 G14
1551 B1 2502 B10 2511 D10 2519 E12 2527 B13 2535 B8
1552 B2 2503 F14 2512 F10 2520 E12 2528 H13 2550 A2
1553 C2 2505 B8 2513 C10 2521 C12 2529 C14 2551 A2
1554 D2 2506 D8 2514 G10 2522 G12 2530 G14 2552 B2
1555 E2 2507 B9 2515 D11 2523 C12 2531 C13 2553 B1
1556 G2 2508 D9 2516 F11 2524 G12 2532 G13 2554 G4
2500 A8 2509 C9 2517 D11 2525 C13 2533 C14 2555 H3
1 2 3
COMBI BOARD
Source Selection / Sound Control part
2550
A
22n
2551
1550
4
2n2
T551 * 3551
2
39K
*
T552 3552
1
AUX
39K
* *
3 2552 3554 3553
6K8 6K8
2n2
2553
B
22n
1551
(MC148)
T553
-CMOS
1552 -8V2
7
T556 3556 22K
*
TAPE_R
6
6 *
5552 2u2
+5V6_S
+12A +5V6
* 9551
5 5 +12V_AF
T554
TAPE_L
T555
4 4 * 3555 22K
GND
REC_R
3 3
T558
C REC_R
from
2
2
T557
3585, 3586
REC_L
1
1
REC_L
FE-BT-VK-N FE-BT-VK-N
*
+CD_MTF_MOTOR
1553
9552
T559
*
+Motor
9553
2
+12V
GND
1
EH-B
D
1554
T561 *
3557
1
CD_L
33K
2
GND
*
3558
T562
3
CD_R
33K
4 *
+5V CD_+5
3559
T563
5
3K3
GND
6 +CD_MTF_MOTOR
+SERVO
T564
E
FE-BT-VK-N
1555 9554 (forseen only)
*
T565 3561
1
LEFT
5550
15K T567
2
GND
* 470n
T566 3562
3
RIGHT
5551
15K T568
4
VCC
470n
5 T569
TU_EN / MPX
6
T570
F 9555
TU_DATA (forseen only)
7
T571
TU_CLK
8
T572
/STEREO
FE-BT-VK-N
1556
+5V6_S
T573 +5V6_S
+RDS
16
TU_EN / MPX
15
G
TU_DATA
14
TU_CLK
13
/STEREO
12
T574 0V 4.2V 4V
BKLT_ON
STANDBY
11 0V 0V
T575 0V
AU_STR
10 0V 0V
T576 0V
AU_DATA
9 0V 0V
T577 0V
AU_CLK
8
3.3V 0V MUTE
T578 0V
H
MUTE
7
T579 3.84V 3.73V
3.14V
PWM
PWM
6 2555
to 6500
2u2
D_GND
5
T580
+5V6 +5V6
4
T581
/PWRDWN
3
T582
/BKLT
2
+A
+12V
1 T583
I
FE-BT-VK-N
PWRDWN
from
Supply Part
1 2 3
PCS 104 566
7-1
2557 G6 2566 D6 3501 B9 3510 E9 3518 E12 3526 H12
2558 I6 2567 B7 3502 B10 3511 C10 3519 E12 3527 B12
2559 I6 2568 D7 3503 B10 3512 G10 3520 E12 3528 H12
2560 I7 2569 B7 3505 C8 3513 D11 3521 E13 3529 C12
2561 F6 2570 D7 3506 E8 3514 F11 3522 E12 3530 G12
2563 B5 2571 G7 3507 C9 3515 D11 3523 D12 3531 C12
2564 C6 2573 A4 3508 E9 3516 E11 3524 F12 3532 G12
2565 B6 3500 A7 3509 C9 3517 D12 3525 B12 3533 C13
4 5 6
SOURCE SELECTOR
+VS
from 7552
A1 A0 +VS
2573
100n 16 9 10
VDD
MSB LSB
LOGIC
7551
3579
150K 4.2V
HEF4052BP
3577 7555
0.54V
BC847B
4.35V
470R
TAPE_L 1 LL
2567
2565
TUNER_L 5
2563
LH H
100p 2u2
470n
0V 3.6V
HL L
AUX_L 2 3
3.75V
CD_L 4
HH 3581
2K7
3575
15K
TAPE_R 12
LL
3576
TUNER_R 14 LH H
15K
AUX_R 15 13 +VS
HL L
CD_R 11 HH
2564
470n 3580
VSS VEE
150K 4.2V
8 7 6 7556
3578 0.54V
BC847B
4.35V
T550 470R
2568
2566
100p
2u2
3.6V
Source Selection 0V
Logic Table 3.75V
3582
Source A1 A0
*
2K7
3 560
TAPE 0 0
3K3
AUX 1 0
TUNER 0 1
CD 1 1
REC_R
to 1551 or 1552
REC_L
7553
+12V_AF 5.27V
BC327-40
0V 0V
CD_+5 +5V6
3574
47K
4.65V
5.5V
CD on = Low
4.9V
5.7V
5V
2561
3563 0.55V T585
+VS 22u
3589
100R +5V6
220R
2554
5.5V
220u
5.35V 5.7V
3572
10K
2557
470n
15
1
3
2
0V 3.9V
3.9V
3.5V
0V 3.5V
3568
7550
+12V
BC817-25
1K
2.85V
T584
0V
BACKLIGHT
2.85V
3565
22R
6550
BZX79-C3V3
2560
2558 2559
3566
220p 220p 220p
22R
4 5 6
*
Model
MC10
MC20
3534 G13 3542 I14 3552 A3 3560 E4 3573 H8 3581 B7 3589 G7
3535 C13 3543 B14 3553 B3 3561 E2 3574 F6 3582 D6 5550 E3
3536 G13 3544 H14 3554 B3 3562 F2 3575 C5 3583 B7 5551 F3
3537 A14 3545 C14 3555 C2 3563 G4 3576 C5 3584 D7 5552 C2
3538 I14 3546 G14 3556 B2 3565 I4 3577 B6 3585 C7 6500 B10
3539 B14 3547 B15 3557 D3 3566 I4 3578 D6 3586 E7 6550 I5
3540 H14 3548 H15 3558 D3 3568 H5 3579 B6 3587 B7 7500-A F10
3541 A14 3551 A3 3559 E3 3572 G7 3580 D6 3588 D7 7500-B F11
7 8 9 10
ELECTRONIC VOLUME CONTROL
4.2V
T500
3500 0.57V
4.1V
Vc to 7500 pin 14
820R
+VS
2500
100u
3501 2501
470R
220u
2569
3587 4.05V
4.1V 3502
T595 3K9 T501
1u
0.57V
2K2
3583
2502
4K7
10u
2505 2507
3.55V
100p 0V 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
0.2V
22p
3505 3509
33K 33K
2511
220n
2570
3588
7500-F
HEF4069UBP
1u T596 3K9
3584
4K7
2506 2508
3.55V
100p 100p
0V
0V
3586
3.6V
2K2
3508
7502 7504
ON4986 ON4986
15R
3.55V
0V 3.55V 0.2V
3.6V
3.6V 2510 0V T504
0.2V
22p
3506 3510
33K
33K
7500-A
HEF4069UBP
2512
220n
5.35V
5.5V
5.7V 2571
470n
T586
7552
16
HEF4094BP
SRG8
EN1
uP Port Extension
STB
LOGIC TABLE
0/5.5V T587
4
Sound features Control lines
D 1 JAZZ
0/5.5V T588
5
DSC DBB DBB POP BASS
POP
0/5.5V T589
6
INCR off off 0 0
0/5.5V T590
7
(flat)
1 0
BASS on
5.7V 5.5V T591 3573
14 0.67V CD
1 0
off
Rock
1K
0/5.5V T592
13
DBB on 1 0
5.35V
12 0V T593 5.5V
A0 off 0 0
to Source Sel. Jazz
0V 0V 5.35V
11 T594
7554
on 1 0
A1
9
off 1 1
Pop
10
on 1 1
8
7 8 9 10
3541 3551 3553 3555 3557 3559 3561
Item
5552 9551 9552 9553
3542 3552 3554 3556 3558 3560 3562
220K 39K 6K8 22K 33K 3K3 15K 2.2uH
150K 33K 8K2 6K8 18K 2K7 10K
7-1
7500-C F13 7505 D12 7513 B13 9551 C2 T504 E9 T557 C2
7500-D D13 7506 F12 7514 H13 9552 C2 T550 D5 T558 C2
7500-E D11 7507 B12 7550 H4 9553 D2 T551 A2 T559 D2
7500-F D10 7508 H12 7551 B4 9554 E3 T552 A2 T561 D2
7501 C8 7509 C12 7552 G7 9555 F3 T553 B2 T562 D2
7502 E8 7510 G12 7553 F5 T500 A8 T554 C2 T563 E2
7503 C9 7511 B13 7555 B6 T501 B9 T555 C2 T564 E2
7504 E9 7512 H13 7556 D6 T503 C9 T556 B2 T565 E2
11 12 13
DIGITAL SOUND CONTROL (DSC)
BASS
BC847B
7511
POP JAZZ
2527
10n
6500 PWM
3503
BC847B
3525 3527
470R from 1556
1N4148
220K 220K
7507
0/2.65V
BC847B
2521
3529
0/2.1V 1n5 27K
2531
0/2.65V
2513
100n
0/2.1V
2523 3531 3533
47p
7509
3511 27K 33K
680p
BC847B
2525
100K
47p
Vc 2.05V
1V
14
12
2.05V 3523
9
13 Vc 2.05V
7500-E 33K
7500-D
7 0V
HEF4069UBP BC847B
HEF4069UBP
2.05V
14
7505
2515 2.08/2.1V
3513 2.05V 10
11
0V
10n 15K
2.05V 7
2517 3517
3515
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
1n5 33K 100K
Vc
2.05V
Vc
14
2516 0V
3514 4
3
2.05V
7506
15K 2.08/2.1V
10n 2.05V 7500-C
7500-B
7
BC847B
0V HEF4069UBP
HEF4069UBP
14 2.05V
2.05V 3524
1 2 5
1V 33K
7
2.05V
2526
3512
47p
2524
0/2.1V 3532 3534
100K
680p 27K 33K
2514
2532
BC847B
47p 0/2.65V
7510
100n
2522 3530
0/2.1V
27K
1n5
BC847B
0/2.65V
7508
3526 3528
220K 220K
JAZZ
1 0
1 0
2528
POP JAZZ
1 0
10n
0 0
1 1
1 1
1 1
0 1
11 12 13
(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"
T566 F2 T574 G2 T582 I2 T590 H8
T567 E3 T575 H2 T583 I2 T591 H8
T568 F3 T576 H2 T584 I4 T592 I8
T569 F2 T577 H2 T585 G4 T593 I8
T570 F2 T578 H2 T586 G7 T594 I8
T571 F2 T579 H2 T587 H8 T595 B7
T572 F2 T580 H2 T588 H8 T596 D7
T573 G2 T581 I2 T589 H8
14 15
A
DBB
3537
220K
*
3541
0/2.9V
220K
2/2.36V
3539
22K
B
BASS_ALC
7513 -0.3/0.56V 3547
150K
from
3543
Amplifier Part
82K
2529
100n
3545
8K2
2533
C
47n
3535
100K
Vc
2.13V
14
8 2.1V 1.1V L
to
D
7
Amplifier Part
E
Vc
2503
22n
F
14
R
6 2.1V
to
1.1V
7
Amplifier Part
2.13V
3536
100K
2534
G
47n
3546
8K2
2530
100n
3544
82K
BASS_ALC
3548
7514
-0.3/0.56V 150K
H
from
BC847B
Amplifier Part
BC847B
7512 3540
22K
*
2/2.36V
3542
0/2.9V
220K
3538
I
220K
BASS DBB
14 15