Philips CDR796 Service Manual page 35

7-5
0060 A1 1452 A3 3550 A2 3553 A3 3556 C4 6450 B2
1450 A3 1453 A4
3551 A2 3554 A4 3557 C2 6451 B4
1451 A2 1454 A4 3552 A3 3555 C2 3558 C3 7450 C3
1 2
KEY BOARD
0060
F475
6
D
A
5
+5V
5 –0,25V
F474 3550 3551
KEY_0 5 –0,25V
4
F473
820R 1K2
3
F472
LED_SPEED
4,7V/0V
2
F471
LED_ON/OFF
1
F470
4,9V/0V
FE-ST-VK-N
KEY
B
+5V
red
C
0,7V/0V on=0,1V
3557
10K
. . . V DC VOLTAGES MEASURED IN
STOP MODE
V EVM
UNLESS STATED OTHERWISE
... /...V on/off
1 2
0060 A1 1452 A3 3550 A2 3553 A3
1450 B1 1453 A3 3551 B2 3554 A3
1451 A1 1454 A4 3552 B2 3555 A2
KEY Board / copperside view
7451 C4 F472 A1 F475 A1
F470 B1 F473 A1
F471 B1 F474 A1
3 4
A
3552 3553 3554
1K8 3K9 10K
B
+5V
blue
SPEED
STANDBY
(key lighting)
C
0,7V/0V on=0,1V
3558
7451
7450
BC847B
BC847B
10K
D D
Key Board CDR79x, 260302
3 4
3556 B3 6450 B2 7451 A3
3557 A1 6451 B3 9451 A2
3558 B2 7450 A2 9452 B3
Key Board stage .2 CDR79x, 030402
1460 C2 3571 C5 3573 B3
3570 C5 3572 C6 3574 B3
1 2
LIGHTGUIDE BOARD
(Rec. Indicator)
A
B
1460
5 –0,25V
F480
4
+5V
C
3
on=1,6V
F481
2
LED_red
F482
1
LED_blue
D
FMN
1 2
. . . V DC VOLTAGES MEASURED IN
STOP MODE
V EVM
UNLESS STATED OTHERWISE
1460 A1 3571 D1 3573 E1 3575 D1
3570 D1 3572 E1 3574 C1 3576 E1
Lightguide Board/ copperside view
1460
LED blue
4461
LED red
4463
GND
+5V
7-5
3575 B4 6462 B3 6464 B3 6466 B4 6469 B4 F481 C2
3576 B4 6463 C5 6465 C5 6468 C6 F480 C2 F482 D2
3 4 5 6
+5V
A
4x LST770-KL
red
+5V
3x LBT776-K1L1
blue B
C
on=0,4V
D
Lightguide Board CDR79x, 270302
3 4 5 6
4461 A1 6462 E1 6464 C1 6466 D1 6469 E1
4463 A1 6463 D1 6465 D1 6468 E1
Red Blue Red Blue Red Blue Red
3571 3575 3570 3573 3572 3576
Lightguide Board stage .2 CDR79x, 270302