Hitachi VTMX900ECT Wartungshandbuch Seite 96

3-14
Power Supply (PS)
0040 B5 1309 A13 2307 D10 2315 G10 2323 H13 3303 B10 3312 D4 3321 G13
1300 G2 2300 A10 2308 D7 2316 H4 2324 H11 3305 G4 3313 I11 3322 D5
1301 H3 2301 C11 2309 E11 2317 H9 2325 G10 3306 B11 3314 E6 3324 I8
1302 H5 2302 C7 2310 F5 2318 H7 2327 B12 3307 C10 3315 D8 3325 I9
1304 E14 2303 C6 2311 F10 2319 A14 2328 F9 3308 C5 3316 E10 3326 H5
1306 G12 2304 C8 2312 G10 2320 H12 3300 A11 3309 C7 3318 F4 3327 B12
1307 H10 2305 C10 2313 G11 2321 I10 3301 C12 3310 C12 3319 G9 3328 A12
1308 E10 2306 C13 2314 G13 2322 H12 3302 B10 3311 C12 3320 G13 3329 A12
1 2 3
4
7303
A
MC44608
294V
8 1
VI
DEMAG
B
200 µA
200 µA
C
18.2V
2
NC
7
D
2
PLAY 01 PLAY 02
E
0V
A: DC, 2 V/Div, 10us/Div A: DC, 100mV/Div, 10us/Div
T 7302 GATE IC 7303 PIN2
F
F344
F379
G 1300
F348 F349
W2
Mains
H F350 F351
W1
1301
F352
T1,25AL
HOT CIRCUIT , BE CAREFUL AND USE AN
ISOLATION TRANSFORMER WHEN SERVICING
I DO NOT OPERATE WITHOUT CASE
.. OSCILLOGRAMS
CAUTION : LETHAL POTENTIALS AT PRIMARY
..V MEASURED IN PLAYBACK MODE
..V MEASURED IN RECORD MODE
1 2 3
3330 B12 3339 H13 3351 F12 5300 C7 5308 C10 6307 E6 6315 B11 6323 G11
3331 E6 3340 H11 3352 F12 5301 B8 6300 C11 6308 E10 6316 B12 6324 H11
3332 B13 3341 H10 3353 F13 5302 C12 6301 C10 6309 G10 6317 B13 6326 B9
3333 C12 3343 C14 4301 A9 5303 D12 6302 D7 6310 G6 6318 G11 7300 A8
3334 E8 3344 D14 4302 B14 5304 G11 6303 D10 6311 G7 6319 H12 7301 B10
3335 G12 3345 D15 4303 A14 5305 H5 6304 D7 6312 H6 6320 G11 7302 C7
3336 B11 3347 D4 4305 E13 5306 E12 6305 E7 6313 H7 6321 H12 7303 A3
3338 G11 3350 E13 5009 E8 5307 E11 6306 E10 6314 A9 6322 H11 7304 D11
4 5 6
200 µA
VCC
6
t
7302
2SK2750
0.8V
F305
3308
F302
F301 F303 F304
5
100R
GND
4 1
5.1V
CTRL 3
I343 F339
3312 3347
1R 1R
for < 1Watt 3K9 1% and 470R
PLAY 03
0V
0V
F340
6307 F342
A: DC, 10 V/Div, 10us/Div
BAV21
TRAFO5301 PIN5
50V / ZL-Type
3318
F345 F346 F347
1K
F300
3305
220K
F357
F356 6310 6311
1N4006GP 1N4006GP
5305
HF2022R
6312 6313
1N4006GP 1N4006GP
F353 I326 3326 F354 F380
1302
DSP 220R
GND GNDM1 GNDD GNDLED
4 5 6
3-14
7305 D13 7314 H11 9003 H1 C301 I5 F305 C7 F313 C10 F321 C14 F329 E10
7306 G12 7315 D14 9004 H1 C303 I5 F306 C8 F314 C10 F322 D11 F330 E10
7307 G13 7316 C14 9005 I1 C304 I6 F307 C9 F315 C14 F323 D11 F331 E9
7308 A12 7350 E13 9006 I1 F300 G4 F308 C9 F316 C15 F324 E12 F332 E11
7309 B12 7351 F12 9007 I1 F301 C5 F309 D10 F317 C11 F325 E13 F333 F13
7310 D15 9000 H1 9301 G14 F302 C5 F310 A8 F318 C11 F326 E9 F334 I13
7311 H14 9001 H1 9302 H14 F303 C6 F311 A9 F319 C12 F327 E10 F335 H10
7313 H11 9002 H1 C300 G14 F304 C6 F312 A9 F320 C13 F328 E10 F336 H10
7 8 9 10
4301
6314
F311
BAS216
4
1
7300
TCET1101G
3 2
F310 F312 I302 I303 2300
3302 3303
220R 10K
1 100n
5301
3
d3
CT283D3
3 18
2
3307
5300 F306 F307 F313 F314 5308
17
100MHZ
22R
NFR25
6301
F308
16
SBYV27-200
F338 F309 6303
BYT42M
1 15
3316
F326 6306
14
BYD33D
22R
NFR25
3334
120R
1308
5009 F367 F331 6308 -10.7V
5 13
not used 1.25A
BYD33D
PSC
3
12 -14.1V
I313
F363 6309 F366
F381
11
SB360 L
F364 2315 2325
3319
4R7 F365
10n 10n
F362
6 10
F335 F336
F358 2317 F361
2n2
* DISCHARGE POS 2318
7313
BEFORE REPAIRING !
BC847BW
3324 F359 F360 3325 F337
3M3 3M3
7 8 9 10
Interconnections:
AF page 3-27 AL page 3-24
FV page 3-21 FOME page 3-34 I/O page 3-33
F337 I10 F345 F4 F353 H4 F361 H9 F369 G11 F377 A12 F387 A13 I304 A11
F338 D8 F346 F4 F354 H5 F362 G9 F370 G13 F378 B15 F388 A13 I305 G12
F339 D6 F347 F5 F355 H6 F363 G9 F371 G13 F379 G3 F389 A12 I306 H11
F340 E5 F348 G2 F356 G6 F364 G10 F372 G14 F380 H6 F390 E15 I307 C11
F341 A15 F349 G3 F357 G5 F365 G10 F373 H14 F381 G9 F391 E14 I308 C12
F342 E6 F350 H2 F358 H8 F366 G10 F374 F13 F382 E11 I301 C7 I309 E7
F343 A15 F351 H3 F359 I8 F367 E8 F375 F13 F385 E10 I302 A10 I310 G13
F344 F3 F352 H3 F360 I9 F368 G11 F376 E14 F386 E10 I303 A10 I311 H12
11 12 13
7308
F377 BC327-25 F387 1309 F388
3328
33R
13V F389 T100mA
9.4V
19372
3329
I314
47K
12.3V
I315 6316
9V 7309
BC847BW
I316
BZX79-B3V9
8.5V
I317
3332
470R
3301
6300 150K not used
BYD33J
F317 F318 5302 F319 F320
10u
14.8V
3333 3311 I308 2306 I319
I307 220R 220R 220n
BD438
7304
7305
BC847BW
5303
F322 F323
330n BC847BW
5306 F324
F325
330n
I329
5307
4305 -10.8V
-10.6V
5V_STBY 5V_STBY
7350
F332 F382 BC337-25
7351
-9.9V
BC857BW
5.2V
I318
3352 I327
10K 4.6V I328 3353
5.2V
4K7
F333
F374 F375
F371 F370
5304 F368 F369 1306
10u
1.6A
PSC
I310
3320
13.6V 330K
PDTC124EU
7307
6320
0V
BAT254
7314
BC557C
7311
I306 6321 I311 2323 I312
BC847BW
BAS216 100n
2322 3339
I324 2n2 1K
F334
( prepared for < 1W )
not used
11 12 13
AIO1 page 3-17 AIO2 page 3-15 DE page 3-19 FM ST page 3-22 FM NIC-page 3-23
PS page 3-14 VPO page 3-32 VS page 3-31
I312 H13 I320 D14 I328 F13
I313 F10 I321 D15 I329 E14
I314 A12 I322 G12 I343 D6
I315 B11 I323 G11 I344 I5
I316 B12 I324 H11 I345 I11
I317 B13 I325 H10 I346 H14
I318 F12 I326 H5
I319 C14 I327 F13
14 15
F341 A
9VA
F343
4303
9VASW
B
F378
4302
14AL
F315 F316
33V
14VM1
C
14.7V
7316
BC857BW
14.1V
F321
CSW
0.2V
D
7315 0.7V
0.7V
0V 7310
PDTC124EU
9_14VM2
1304 F376 F390
18VNEG E
125mA
MP
HEHI
F
HELO
5V_STBY
5VD
C300
5VA
G
5V_1WSTBY
F372
STBY
H
F373
I
14 15
VS_S page 3-28