JVC HR-A37U Diagram

SECTION 4

1 2 3

Removable connector

Wire soldered directly on board

Non-removable Board connector

Board to Board

Connected pattern on board The arrows indicate signal path

REF No. LOCATION

Category: IC

Horizontal “A” zone Vertical “6” zone

B : Foil side

(A : Component side)

C : Chip component

(D : Discrete component)

IC101 B C 6A

CHARTS AND DIAGRAMS

NOTES OF SCHEMATIC DIAGRAM

Safety precautions The Components identified by the symbol are

critical for safety. For continued safety, replace saf ety critical components only with manufacturer's recommended parts.

1. Units of components on the schematic diagram

Unless otherwise specified.

1) All resistance values are in ohm, 1/6 W, 1/8 W (refer to parts list). Chip resistors are 1/16 W.

K: KØ (1000Ø), M: MØ (1000KØ)

2) All capacitance values are in µF, (P: PF).

3) All inductance values are in µH, (m: mH).

4) All diodes are 1SS133, MA165 or 1N4148M (refer to parts list).

2. Indications of control voltage

AUX : Active at high AUX or AUX(L) : Active at low

3. Interpreting Connector indications

4) Indication on schematic diagram Voltage Indications for REC and PB mode on the schematic diagram are as shown below.

REC mode

123

2.5

(5.0)

PB mode

1.8

PB and REC modes (Voltage of PB and REC modes are the same)

Note: If the voltages are not indicated on the schematic

diagram, refer to the voltage charts.

5. Waveform measurement

1) Video circuits REC : Colour bar signal in SP mode, normal VHS mode PB : Alignment tape, colour bar SP mode, normal VHS

mode

2) Audio circuits REC : 1KHz, –8 dBs sine wave signal in SP mode, normal

VHS mode

PB : REC then playback it

3) Movie Camera circuits Measured using a correctly illuminated gray scale or colour bar test chatrs in the E-E mode

4) Indication on schematic diagram Waveform indications on the schematic diagram are as shown below.

Measurement point

6. Signal path Symbols

The arrows indicate the signal path as follows.

Playback signal path Playback and recording signal path Recording signal path

(including E-E signal path) Capstan servo path Drum servo path

(Example)

R-Y

Playback R-Y signal path

Recording Y signal path

7. Indication of the parts for adjustments

The parts for the adjustments are surrounded with the circle as shown below.

8. Indication of the parts not mounted on the circuit board

“OPEN” is indicated by the parts not mounted on the circuit board.

CIRCUIT BOARD NOTES

1. Foil and Component sides

1) Foil side (B side) : Parts on the foil side seen from foil face (pattern face) are indicated.

2) Component side (A side) : Parts on the component side seen from component face (parts face) indicated.

2. Parts location guides

Parts location are indicated by guide scale on the circuit board.

Note:

For general information in service manual, please refer to the Service Manual of GENERAL INFORMA TION Edition 4 No. 82054D (January 1994).

4. Voltage measurement

1) Video circuits

2) Audio circuits

3) Movie Camera circuits

S40884-03

REC : Colour bar signal in SP mode, normal VHS mode PB : Alignment tape, colour bar SP mode, normal VHS

mode

— : Unmeasurable or unnecessary to measure

REC : 1KHz, –8 dBs sine wave signal in SP mode, Nor-

mal VHS mode

PB : REC then playback it

Measured using a correctly illuminated gray scale or colour bar test charts in the E-E mode

22201816

C329

C330

0.1/50

R344 47K

R343 18K

0.1/50 C331

11/10

R345 10K

5) Waveform indications

Waveform number

WF25

REC/PB 1.2 Vp-p

50 mV/2 msec/DIV

Oscilloscope Volts and Time/Division, Probe 10 : 1

Mode : REC or PB modes

WF25

R346 15K

ALC OUT

Waveform number

Waveform name or measurement point

Level : 1.2 Vp-p

4-1 4-2

4-1

4-2

R216

OPEN

S40884-03

4.1 BOARD INTERCONNECTIONS

CN1

OPEN

MAIN

(

VIDEO/AUDIO Page 4-5

(

SYSCON

(

SW.REG

(

TUNER

(

FRONT

(

TERMINAL Page 4-15

Page 4-7 Page 4-9 Page 4-11 Page 4-13

OPEN

) ) )

OPEN

CON1

OPEN

(

)(

Page 4-17

)

OPEN

p10335001a rev0

4-3 4-4

4.2 MAIN (VIDEO/AUDIO) SCHEMATIC DIAGRAM

TO FMA/DEMOD

OPEN

TO SYSCON

TO SW.REG

OPEN

TO FMA/DEMOD

TO U.DRUM

The Parts Number,value and rated voltage etc. in the Schematic Diagram are for references only.

Note :

When replacing the parts,refer to the Parts List.

TO SYSCON

TO A/CHEAD CN1

TO FULL ERASEHEAD

TO SYSCON

TO FMA/DEMOD

TO SYSCON

OPEN

: Not used

: Used

p10333001a

rev0

4-5 4-6

4.3 MAIN (SYSCON) SCHEMATIC DIAGRAM

TO FRONT

TO SW.REG

FRONT

TO FRONT

TO TUNER

TO FMA/DEMOD

TO TUNER

TO TUNER FMA/DEMOD

TO TUNER

OPEN

The Parts Number,value and rated voltage etc. in the Schematic Diagram are for references only.

Note :

When replacing the parts,refer to the Parts List.

HR-VP49U

30015

SYSCON IC IC3001 A EEPROM IC3004 4K LITHIUM BACK UP D3008

R.PAUSE FW3001 C.BOX CTL Q3005

ADV. JOG/SHUTTLE R3240 R3241

3.58NTSC[L]/ R3044 POWER SAVE[H] BACK UP C3026

SHORT

OPEN

SUB CLOCK R3042

POWER DET R3232 R3233 R3234

IN1

Vcc

IN2

OUT2

Vre5VsOUT1

GND

RESET CIRCUIT R3220 5.6k

MN101D02GWA

RESET IC IC3003

OPEN

OSD R203 R204

ESD C3007

OPEN

R3235 CN3007

R3236 D3007 R7202 R7203 R7204 L7201 C7206 Q7201 C7201

C3028 CN3005 B3001 D3004

R3242 X3002 C3018 C3019 0Ω C3020

D3006 D3004 R3114

R3222 470 R3243 R3244 R3245 D3016 Q3006 Q3007 C3011

C3013 C3022

C208 C210 0Ω C209 C211 B201 Q202 L204 R210 R211 C212 C213

C3008 0.01 C3015 C3048 D3015 R3237 R3238 4.7k R3017 R3018 1k

HR-A37U

x x x x x x

x x

x x x o x x o x x

x x x o

o o o x x

x x

o x

TO FMA/DEMOD

OPEN

4-7 4-8

S-24C04BFJ-X

p10334001a rev0

TO VIDEO/AUDIO

TO TERMINAL

TO VIDEO/AUDIO

TO FMA/DEMOD

TO TERMINAL

OPEN

# IC3001 MN101D02GW∗ /MN101DP02JAFW∗ # IC3004

32K AT24C32N-10SC-X

24LC32B/SN-X BR24C32F-X

8K AT24C08N-10SC-X

24LC08B/SN-X BR24C08F-X X24C08S-X

4K S-24C04BFJ-X

AT24C04N-10SC-X 24LC04B/SN-X BR24C04F-W-X X24C04S-X

2K S-24C02BFJ-X

AT24C02N-10SC-X 24LC02B/SN-X BR24C02F-W-X

4.4 MAIN (SW.REG) SCHEMATIC DIAGRAM

SHORT

The Parts Number,value and rated voltage etc. in the Schematic Diagram are for references only.

Note :

When replacing the parts,refer to the Parts List.

TO SYSCON

TO TUNER

TO SYSCON

GROUND POINT FOR PRIMARY VOLTAGE

DANGEROUS VOLTAGE

GROUND POINT FOR SECONDARY VOLTAGE

TO VIDEO/AUDIO,SYSCON,TUNER FMA/DEMOD

TO TUNER

TO SYSCON

TO VIDEO/AUDIO,SYSCON,TUNER TERMINAL,FMA/DEMOD

TO VIDEO/AUDIO,SYSCON,TUNER FMA/DEMOD

TO SYSCON

4-9 4-10

p20185001a rev1

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