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— 2 —

1.

Check the area of your repair for unsoldered or poorly-soldered
connections.  Check the entire board surface for solder splashes
and bridges.

2.

Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.

3.

Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair.  Point
them out to the customer and recommend their replacement.

4.

Look for parts which, through functioning, show obvious signs
of deterioration.  Point them out to the customer and
recommend their replacement.

5.

Check the B+ voltage to see it is at the values specified.

6.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270˚C

during repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)

Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than

ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

After correcting the original service problem, perform the following

safety checks before releasing the set to the customer.

0

0

0

CAUTION :
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.

— 3 —

4-2.

SCHEMATIC DIAGRAMS

• VC-311 (1/8)(CAMERA A/D CONV., TIMING

GENERATOR)

SCHEMATIC DIAGRAM ···························· 4-37

• VC-311 (2/8)(IRIS/FOCUS/ZOOM DRIVE)

SCHEMATIC DIAGRAM ···························· 4-39

• VC-311 (3/8)(DV SIGNAL PROCESS, DV INTER-

FACE, USB, AUDIO VIDEO OUT)

SCHEMATIC DIAGRAM ···························· 4-41

• VC-311 (4/8)(REC/PB AMP, EVR)

SCHEMATIC DIAGRAM ···························· 4-43

• VC-311 (5/8)(DRUM/CAPSTAN/LOADING DRIVE)

SCHEMATIC DIAGRAM ···························· 4-45

• VC-311 (6/8)(MECHA/CAMERA CONTROL)

SCHEMATIC DIAGRAM ···························· 4-47

• VC-311 (7/8)(AUDIO I/O, A/D, D/A CONV.)

SCHEMATIC DIAGRAM ···························· 4-49

• VC-311 (8/8)(CONNECTOR, DC SUPPLY)

SCHEMATIC DIAGRAM ···························· 4-51

4-3.

PRINTED WIRING BOARDS

• VC-311(CAMERA A/D CONV., TIMING GENERA-

TOR, IRIS/FOCUS/ZOOM DRIVE, DV SIGNAL
PROCESS, DV INTERFACE, USB, AUDIO VIDEO
OUT, REC/PB AMP, EVR, DRUM/CAPSTAN/LOAD-
ING DRIVE, MECHA/CAMERA CONTROL, AUDIO I/
O, A/D, D/A CONV., CONNECTOR, DC SUPPLY)

PRINTED WIRING BOARD ······················· 4-73

4-4.

WAVEFORMS ······························································ 4-79

4-5.

MOUNTED PARTS LOCATION ································· 4-83

5-2.

ELECTRICAL PARTS LIST ········································ 5-21

4-7

(For schematic diagrams)
• All capacitors are in 

µ

F unless otherwise noted. pF : 

µ

µ

F.  50 V or less are not indicated except for electrolytics

and tantalums.

• Chip resistors are 1/10 W unless otherwise noted.

k

Ω

=1000 

Ω

, M

Ω

=1000 k

Ω

.

• Caution when replacing chip parts.

New parts must be attached after removal of chip.
Be careful not to heat the minus side of tantalum
capacitor, Because it is damaged by the heat.

• Some chip part will be indicated as follows.

Example

C541

L452

22U

10UH

TA  A

2520

• Constants of resistors, capacitors, ICs and etc with XX

indicate that they are not used.
In such cases, the unused circuits may be indicated.

• Parts with 

*

 differ according to the model/destination.

Refer to the mount table for each function.

• All variable and adjustable resistors have characteristic

curve B, unless otherwise noted.

• Signal name

XEDIT

→ 

EDIT

PB/XREC 

→

 PB/REC

•

2

: non flammable resistor

•

5

: fusible resistor

•

C

: panel designation

•

A

: B+ Line

•

B

: B– Line

•

J

: IN/OUT direction of (+,–) B LINE.

•

C

: adjustment for repair.

•

A

: VIDEO SIGNAL (ANALOG)

•

A

: AUDIO SIGNAL (ANALOG)

•

A

: VIDEO/AUDIO SIGNAL

•

A

: VIDEO/AUDIO/SERVO SIGNAL

•

A

: SERVO SIGNAL

• Circled numbers refer to waveforms.
(Measuring conditions voltage and waveform)

• Voltages and waveforms are measured between the

measurement points and ground when camera shoots
color bar chart of pattern box.  They are reference values
and reference waveforms.
(VOM of DC 10 M

Ω

 input impedance is used)

• Voltage values change depending upon input

impedance of VOM used.)

1. Connection

2. Adjust the distance so that the output waveform of

Fig. a and the Fig. b can be obtain.

When indicating parts by reference number, please
include the board name.

Kinds of capacitor

Temperature characteristics

External dimensions (mm)

Y

ello

w

A

A

B

B

A=B

Fig. a (Video output terminal output waveform)

H

Cy

an

Green

White

Magenta

Red

Blue

Fig.b (Picture on monitor TV)

Note :
The components identified by
mark 

0

 or dotted line with mark

0

 are critical for safety.

Replace only with part number
specified.

Note :
Les composants identifiés par
une marque 

0

 sont critiques

pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro spécifié.

1.5 m

Front of the lens

Pattern box