JVC GR-SX860U Diagram

SECTION 4

C331 11/10

22201816

WF25

C329

0.1/50

C330

0.1/50

R344 47K

R343 18K

R345 10K

R346 15K

Measurement point

Waveform number

WF25

REC/PB 1.2 Vp-p

50 mV/2 msec/DIV

Waveform name or measurement point

Level : 1.2 Vp-p

ALC OUT

Mode : REC or PB modes

Oscilloscope Volts and Time/Division, Probe 10 : 1

123

2.5

(5.0)

1.8

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

PB mode

REC mode

CHARTS AND DIAGRAMS

NOTES OF SCHEMA TIC DIAGRAM

Safety precautions The Components identified by the symbol are

critical for safety . For continued safety, replace safety 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: KΩ (1000Ω), M: MΩ (1000KΩ)

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

1 2

Removable connector

1 2

Wire soldered directly on board

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

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.

4. Voltage measurement

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

— : Unmeasurable or unnecessary to measure

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

PB : REC then playback it

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

S40884-03

Non-removable Board connector

2 3

Board to Board

Connected pattern on board The arrows indicate signal path

mode

mal VHS mode

5) Waveform indications

4-1

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

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.

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.

R216

2. Parts location guides

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

REF No. LOCATION

Category: IC

Horizontal “A” zone Vertical “6” zone

(A : Component side)

(D : Discrete component)

B : Foil side

C : Chip component

IC101 B C 6A

Note:

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

OPEN

4-2

S40884-03

4.1 BOARD INTERCONNECTIONS

OPEN

(Only for AX761U,SX860U)

NOTE) : The nimber of patch cords

are indicated by interconnected.

ZOOM UNIT

TOP OPE UNIT

OPEN

Only for

AX761U

4-3 4-4

4.2 CPU SCHEMATIC DIAGRAM

NOTE : • For the destination of each singnal and further line connections that are cut off from this diagram,

refer to “4.1 BOARD INTERCONNECTIONS”

• When ordering parts, be sure to order according to the Part Number indicated in the Parts List.

(OPEN)

4-5 4-6

4.3 VTR ASP SCHEMATIC DIAGRAM

NOTE : • For the destination of each singnal and further line connections that are cut off from this diagram,

refer to “4.1 BOARD INTERCONNECTIONS”

• When ordering parts, be sure to order according to the Part Number indicated in the Parts List.

(OPEN)

4-7 4-8

4.4 MECHA MDA SCHEMATIC DIAGRAM

NOTE : • For the destination of each singnal and further line connections that are cut off from this diagram,

refer to “4.1 BOARD INTERCONNECTIONS”

• When ordering parts, be sure to order according to the Part Number indicated in the Parts List.

4-9 4-10

4.5 VTR DSP SCHEMATIC DIAGRAM

NOTE : • For the destination of each singnal and further line connections that are cut off from this diagram,

refer to “4.1 BOARD INTERCONNECTIONS”

• When ordering parts, be sure to order according to the Part Number indicated in the Parts List.

SN74AHC1G04K

4-11 4-12

4.6 DSP SCHEMATIC DIAGRAM

NOTE : • For the destination of each singnal and further line connections that are cut off from this diagram,

refer to “4.1 BOARD INTERCONNECTIONS”

• When ordering parts, be sure to order according to the Part Number indicated in the Parts List.

(OPEN)

4-13 4-14

4.7 IRIS & AF/ZOOM SCHEMATIC DIAGRAM

NOTE : • For the destination of each singnal and further line connections that are cut off from this diagram,

refer to “4.1 BOARD INTERCONNECTIONS”

• When ordering parts, be sure to order according to the Part Number indicated in the Parts List.

4-15 4-16

4.8 VIDEO OUT SCHEMATIC DIAGRAM

NOTE : • For the destination of each singnal and further line connections that are cut off from this diagram,

refer to “4.1 BOARD INTERCONNECTIONS”

• When ordering parts, be sure to order according to the Part Number indicated in the Parts List.

4-17 4-18

4.9 REGULATOR SCHEMATIC DIAGRAM

NOTE : • For the destination of each singnal and further line connections that are cut off from this diagram,

refer to “4.1 BOARD INTERCONNECTIONS”

• When ordering parts, be sure to order according to the Part Number indicated in the Parts List.

4-19 4-20

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