Jvc HMHDS 1 U Schematic

Page 1

SECTION 4
CHARTS AND DIAGRAMS

NOTES OF SCHEMATIC DIAGRAM 4) Indication on schematic diagram

Safety precautions

The Components identified by the symbol A are
critical for safety. For continued safety, replace safety
critical components only with manufacturer's recom-
mended 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: KQ (10009), M: MQ (1000KQ)

Voltage Indications for REC and PB mode on the sche-
matic diagram are as shown below.

REC mode->25 1.8
<50)

LPB and REC modes

PB mode (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

2) All capacitance values are in uF, (P: PF). . I I
3) All inductance values are in pH, (m: mH). 1) Videocwcuns I .
4) All diodes are 188133, MA165 or 1N4148M (referto parts REC - C?'°r bar 5'9"?" "1 5P m°de~ "03' VHS We
SU- PB : Alignment tape, colour bar SP mode, normal VHS
mode
2. Indications of control voltage 2) AUdiO CerUitS
AUX I Active at hi h REC : 1KHz, -8 st sine wave signal in SP mode. normal
7 ' 9 VHS mode
AUX or AUX(L) : Active at low pB ; REC then playback it
_ _ _ _ 3) Movie Camera circuits
3- Interpreting Connector Indications Measured using a correctly illuminated gray scale orcolour
bar test chatrs in the E-E mode
4) Indication on schematic diagram
Removable connector . . . . .
Waveform Indications on the schematic diagram are as
shown below. Measurement point
a Wire soldered directly on board /
Waveform number
% Non-removable Board connector
E
E: Board to Board
3
E
Connected pattern on. board 5) Waveform indications
The arrows indicate Signal path Waveform number Waveform name or
measurement point
WFZ ALC OUT
4. Voltage measurement 5
1) Video circuits
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
2) Audio circuits _
REC : 1KHZ, -8 st sine wave signal in SP mode, Nor- :5ch 12:35, Level ' 1'2 Vp'p
mal VHS mode %
PB : REC then playback it
3) Movie Camera Circuits Oscilloscope Volts and Time/Division, Probe 10 : 1

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

Mode : REC or PB modes

4-1

Page 2

6. Signal path Symbols
The arrows indicate the signal path as follows.

l:> Playback signal path

C} Playback and recording signal path

- Recording signal path
(including E-E signal path)

C>I> Capstan servo path
-> Drum servo path

(Example)
|:> R-Y Playback Fl-Y signal path

- Y Recording Y signal path

7. Indication of the parts for adiustments

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

-/\/v»-

OPEN

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.

REF No.| LOCATION
IC <7iCategory: IC
|C101|B|CI 6A

B : Foil side

(A : Component side) Horizontal A" zone

C : Chip component Verlical "6" zone

(D : Discrete component)

Note:
For general information in service manual, please refer
to the Service Manual of GENERAL INFORMATION Edi-
tion 4 No. 820540 (January 1994).

Page 20

4.17 DIGITAL AUDIO SCHEMATIC DIAGRAM

O DIGITAL(AUD|O AD/DA

Note :

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

When replacing the parts, refer to the Parts List.

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