Philips MCM8/21 Service Manual page 63

1 2 3
COMBI BOARD
3
SUPPLY, OSCILLATOR & PRE-AMP
A
7311
F228
5303 3304
TL431ACLP
3
+5V6
BEAD 90MHz 1
22R
GND_SHIELD
2
GND_SHIELD GND_SHIELD
B
GND_SHIELD
1 2
C
+12V_M
F226
+12V_A
1 2
7315 100n
LM317P
D
+D F229 2316
GND_SHIELD
1
I O
11.7V
22.9V +D
A
F230
10.4V 10.4V
0V
7317
E
BC847BW
GND_SHIELD
0.7V
7319
BC847BW
F
GND_SHIELD
7321
LM317P
+D2 F221
10.9V 5.6V 5.6V
1
I O +5V6
A
4.35V
G 3343
F231
150R
GND_SHIELD
H
GND_SHIELD
GND_SHIELD
1 2 3
11-7
4 5 6
+5V_AMP
3 4 5
+5V_AMP
4.2V
GND_SHIELD
+OZ
2303
pin14
GND_SHIELD
470p
7312
7312-1
74HCU04D
3312
1 2
1
GND_SHIELD
4,4V 0V
100K
7406
2
2313
OZ_SW
1n0
high level = 425kHz
low level = 500kHz
GND_SHIELD
3 5
PRE-AMPLIFIER
GND_A
6300
BZX384-C3V3
4.7V
3322
3334
LOW_PWR_CTRL
1
10K VOL_LEFT
2.2V
1
1K0
1 2 3
2
1
VOL_RIGHT
9399
GND_M
9398
GND_D
9397
GND_D GND_M
4 5 6
...V DC voltages measured in tuner mode
... / ... V off/on
V
EVM
* ... not defined, floating
7 8 9 10
OSCILLATOR
2334
33p
5300
2300 2301
220p 220p
CSBLA
GND_SHIELD
500K 1,9V
3302
0V
7309
BC847BW
100K
1,9V
3341
7312-3 7312-2 7312-5
74HCU04D 74HCU04D 74HCU04D
6K8
5 6 3 4 11
1 1
1,9V 2V
2V 2,1V 2,1V
3324
1M0
1,9V
7312-6
74HCU04D
7316
3318
2,4V 13
BC857BW
100K
425K
CSBLA
1,9V 2314
GND_SHIELD
220p
5302
GND_SHIELD
3327
3317
2326 33R
33K
100p
2324
3332 3328
3K3 8K2 GND_A
4u7 A
2331
8
5,8V
11,6V
4u7 50V 3340 2330
5 7
6
5,8V
330R
50V 22u
5,8V
7320-2 470R for
4
75 Watt only
NJM4560M
7323
BC817-25W
GND_A
3329
GND_A */0,7V
2327 2K2
100p
3336
A
12K
8
V_MID
5,8V 11,6V
3337
3 1 5,8V
2
2329 330R
3338 3339
5,8V 7320-1
470R for
4 NJM4560M 75 Watt only
1K0 2K2
4u7 50V
BC817-25W
GND_A
3319
*/0,7V
2K2
2
AMP_MUTE
7 8 9 10
for wave forms see chapter 11-2 Service Hints
11-7
11 12
2300 A7
2301 A9
2303 B6
2304 D3
2305 B5
2306 A1
2309 A3
2312 E1
A
2313 C6
2314 D9
2316 D2
2317 E10
2318 E8
2319 A1
2320 H1
2321 G2
2322 G3
B
7312-4
2324 E7
74HCU04D
LOZ
10 9 8 2325 G8
1 1
4
2326 D9
2V 2V 4,2V
2327 F9
0V 2328 G11
2329 G7
2330 E11
2331 E7
+OZ 4,2V C
2332 F7
14
2333 F7
0V
12
1
5
2334 A10
ROZ
2335 F12
7
2336 H12
2337 F1
2339 A4
2340 E11
D
2341 G12
3302 B7
3303 B5
+12V_A
3304 A2
3305 A3
3306 G12
3307 H12
3311 B3
3312 B6
E
3313 D2
3314 E3
LNF 3315 C5
2340
3316 F8
3317 D8
22u 50V F235
4
3318 C7
3319 H10
3320 B10
F
3321 E2
3322 E4
3323 F2
3324 C8
MUTE
3325 F12
GND_A GND_A
3326 G12
adjust to GND_A GND_A
3327 D10
0V ± 1mV DC on speaker terminal
3328 E9
RNF
2328 2341 G
3329 F10
3330 F11
F236
50V 22u 22u 50V
5
3331 H11
3332 E8
7324
3334 E7
3336 G9
3337 G10
3338 G7
3339 G8
H
MUTE
3340 E10
GND_A 3341 B8
GND_A
GND_A GND_A 3342 G2
3343 G1
3344 G1
Combi board P2003 150W class D, 09.04.04 3345 H1
11 12
Attention:
Adjustment to 0V ± 1mV DC has to be done with "cold" set.
After operating a few minutes the value may increase up to 30mV.
3346 E1
3350 F4
4301 A5
5300 A8
5302 D8
5303 A1
6300 E4
7309 B9
7311 B2
7312-1 B6
7312-2 B10
7312-3 B8
7312-4 B12
7312-5 B11
7312-6 C10
7315 D1
7316 C9
7317 E2
7319 E3
7320-1 G9
7320-2 F9
7321 F1
7323 F10
7324 G11
9397 H4
9398 H4
9399 G4
F221 F3
F226 C3
F228 A4
F229 D1
F230 E2
F231 G2
F235 F12
F236 G12