Vitek VT-3629 SERVICE MANUAL

SERVICE MANUAL

MODEL: AX6392N(OIR T)

MENU

CHAPTER TITLE PAGE NO.

1. MEASURMENT GUIDELINE AND DATA

1.1 MEASURMENT CONDITION 3

1.2 MEASURMENT DATA

1.2.1 FM SECTION 4

1.2.2 FM(OIRT BAND) SECTION 5

1.2.3 AM SECTION 6

1.2.4 CD SECTION 7

2 SCHEMATIC DIAGRAM

2. 1 MB SECTION 8

2. 2 DECODE SECTION 9

2. 3 KEY BOARD SECTION 10

2. 4 CD SECTION 11

3 PCB DIAGRAM

3. 1 MAIN BOARD

3.1.1 TOP SILKSCREEN 12

3.1.2 BOTTOM SILKSCERRN LAYER 13

3.1.3 TOP SOLDER MASK LAYEY 14

3.1.4 BOTTOM SOLDER MASK LAYER 15

3.1.5 TOP ROUTING LAYER 16

3.1.6 BOTTOM ROUTING LAYER 17

3. 2 KEY BOARD SECTION

3.2.1 TOP SILKSCREEN LAYER 18

3.2.2 BOTTOM SILKSCERRN LAYER 19

3.2.3 TOP SOLDER MASK LAYER 20

3.2.4 BOTTOM SOLDER MASK LAYER 21

3.2.5 TOP ROUTING LAYER 22

3.2.6 BOTTOM ROUTING LAYER 23

3. 3 CD SECTION

3.3.1 TOP SILKSCREEN LAYER 24

3.3.2 BOTTOM SILKSCREEN LAYER 25

3.3.3 BOTTOM PAD LAYER 26

3.3.4 BOTTOM ROUTE LAYE 27

4 STRUCTURE DIAGRAM

4 .1 MAIN UNIT 28

1 MEASURMENT GUIDELINE AND DATA

1.1 MEASURMENT CONDITION

DESCRIPTION: FM/AM CD/MP3 Player Standard USB Connector with built-in host controller and

SD/MMC card slot USB MP3/enconding RCA Output Power: 4X40W

MEASUREMENT CONDITION:

1. SUPPLY 14.4 V

2. LOADING 4

3. S.T.O. 1

4. dBu =EMF dBu

Ω
W

REVISION

NO.

REVISION DETAILS DATE

1.2 MEASURMENT DATA

1.2.1 FM SECTION
(FM STEREO 1KHz 75KHz DEV. L+R=90% PILOT=10%)

ITEM UNIT NOMAL LIMIT
1 SEPERATION @1mV INPUT R/L dB 30 25

2 STEREO INDICATOR ON SENSITIVITY 98.1MHz dBuV 10 <15
3 AUTO SEEK SENS.(STEREO 75KHz DEV) 98.1MHz dBuV 23 18-28

4 S/N RATIO @1mV INPUT (W/FILTER) 98.1MHz dB 55 50
5 SNC SEPERATION (AT 20dB) 98.1MHz dBuV 48 45-52
6 SNC SEPERATION (AT 3dB) 98.1MHz dB uV 20 35
7 10% T.H.D OUTPUT POWER 98.1MHz W 23 20

8 MAX. OUTPUT POWER SNC 98.1MHz W 40 >35

(FM MON. 1KHz 22.5KHz DEV.)

ITEM UNIT NOMAL LIMIT
1 FREQUENCY RANGE LOW MHz

HIGH MHz

2 INTERMEDIATE FREQUENCY MHz 10.7 ±30KHz
3 USABLE SENSITIVITY (S/N:30dB) 90.1MHz uV

98.1MHz uV

106.1MHz uV

4 I.H.F. SENSITIVITY (75KHz DVE 3% T.H.D.) 90.1MHz uV

98.1MHz uV

106.1MHz uV
5 -3 dB LIMITING SENSITIVITY 98.1MHz uV 5 <10
6 S/N RATIO (@1mV INPUT) 98.1MHz dB 55 50
7 I. F. REJECTION 90.1MHz dB 60 50
8 IMAGE REJECTION RATIO 106.1MHz dB 50 40
9 AM SUPPRESSION 90.1MHz dB 45 35
10 SELECTIVITY+/-200KHz (@1mV INPUT) 98.1MHz dB 30 20

98.1MHz

(PRE-EMPHASIS ON 50U SEC.)

12 T.H.D. @REFERENCE OUTPUT (@1mV INPUT) 98.1MHz % 0.5 1.5
13 OVERLOAD DISTORTION (75KHz 1mV INPUT) 98.1MHz % 1 2
14 10% T.H.D. OUTPUT POWER (75KHz) 98.1MHz W 23 20
15 MAX. OUTPUT POWER (75KHz) 98.1MHz W 40 35

dB

LOW 30 <80 11 FIDELITY-6dB (@1mV INPUT)
HIGH 13K >10

87.5

108(ERU)

107.9(USA)

4
4
4
4
4
4

8
8
8
8
8
8

16 AUTO SEEK SENS.(MONO 22.5KHz DVE) 98.1MHz dBuV 22 18-28

20 ±5 17 LO/DX EFFECT 98.1MHz dB

18 CLOCK TOLERANCE PER DAY(25℃±3℃) SEC ±1 ±3

FM(OIRT BAND) SECTION

1.2.2
(FM STEREO 1KHz 75KHz DEV. L+R=90% PILOT=10%)

ITEM UNIT NOMAL LIMIT
1 SEPERATION @1mV INPUT R/L dB 30 25

2 STEREO INDICATOR ON SENSITIVITY 70.4MHz dBuV 10 <15
3 AUTO SEEK SENS.(STEREO 75KHz DEV) 70.4MHz dBuV 23 18-28

4 S/N RATIO @1mV INPUT (W/FILTER) 70.4MHz dB 55 50
5 SNC SEPERATION (AT 20dB) 70.4MHz dBuV 48 45-52
6 SNC SEPERATION (AT 3dB) 70.4MHz dB uV 20 35
7 10% T.H.D OUTPUT POWER 70.4MHz W 23 20

8 MAX. OUTPUT POWER SNC 70.4MHz W 40 >35

(FM MON. 1KHz 22.5KHz DEV.)

ITEM UNIT NOMAL LIMIT
1 FREQUENCY RANGE LOW MHz

HIGH MHz
2 INTERMEDIATE FREQUENCY MHz 10.7 ±30KHz
3 USABLE SENSITIVITY (S/N:30dB) 67.1MHz uV

70.4MHz uV

72.5MHz uV

4 I.H.F. SENSITIVITY (75KHz DVE 3% T.H.D.) 67.1MHz uV

70.4MHz uV

72.5MHz uV
5 -3 dB LIMITING SENSITIVITY 70.4MHz uV 5 10
6 S/N RATIO (@1mV INPUT) 70.4MHz dB 55 50
7 I. F. REJECTION 67.1MHz dB 60 50
8 IMAGE REJECTION RATIO 72.5MHz dB 40 30
9 AM SUPPRESSION 70.4MHz dB 45 35
10 SELECTIVITY+/-200KHz (@1mV INPUT) 70.4MHz dB 30 20

70.4MHz

(PRE-EMPHASIS ON 50U SEC.)

12 T.H.D. @REFERENCE OUTPUT (@1mV INPUT) 70.4MHz % 0.5 1.5
13 OVERLOAD DISTORTION (75KHz 1mV INPUT) 70.4MHz % 1 2
14 10% T.H.D. OUTPUT POWER (75KHz) 70.4MHz W 23 20
15 MAX. OUTPUT POWER (75KHz) 70.4MHz W 40 35

dB

LOW 30 <80 11 FIDELITY-6dB (@1mV INPUT)
HIGH 13K >10

65.0

74.0

4
4
4
4
4
4

8
8

8
10
10
10

16 AUTO SEEK SENS.(MONO 22.5KHz DVE) 70.4MHz dBuV 22 18-28

20 ±5 17 LO/DX EFFECT 70.4MHz dB

1.2.3 AM SECTION

MW 400Hz 30% MOD.
ITEM UNIT NOMAL LIMIT

1 FREQUENCY RANGE LOW KHz

HIGH KHz

2 INTERMEDIATE FREQUENCY KHz 450 ±3
3 MAX. SENSITIVITY 600KHz uV

1000KHz uV
1400KHz uV

4 USABLE SENSITIVITY(S/N:20dB) 600KHz uV

1000KHz uV

1400KHz uV
5 S/N RATIO (@5mV INPUT) 1000KHz dB 40 35
6 I. F. REJECTION 600KHz dB 55 45
7 IMAGE REJECTION 1400KHz dB 55 45
8 SELECTIVITY SENSITIVITY (+/-10KHz) 1000KHz dB 30 20
9 -6dB BANDWIDTH @MAX SENSITIVITY 1000KHz KHz 8 4-12
10 AGC F.O.M. (@5mV INPUT) 1000KHz dB 50 40

LOW Hz 50 <100 11 FIDELITY –6dB

(@1mV INPUT)
12 T.H.D.@ REF. OUTPUT 1000KHz % 0.5 1.5
13 OVERLOAD DISTORTION

(@80% MOD. 100mV INPUT)

HIGH KHz 2 1.8

1000KHz % 1.0 3

522(EUR)

530(USA)
1620(EUR)
1710(USA)

18
18
18
31
31
31

30
30
30
63
63
63

14 10% T.H.D. OUTPUT POWER

(@30%MOD 5mV INPUT)

15 MAX. OUTPUT POWER

(@80%MOD 5mV INPUT)

(@5mV INPUT)

17 AUTO SEEK SENS. 1000KHz dBuV 35 30-42
18 LO/DX EFFECT 1000KHz dB 18 >10

(FM 22.5KHZ DVE 1mV)

1000KHz W 23 20

1000KHz W 40 >35

1000KHz
dB

LEVEL mV 700 >600 15 RCA OUT (MAX. VOL LOAD 10K Ω)

DISTOR TION % 1 2

2IF 40 30 16 WHISTLE MODULATION

3IF 35 45