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General Description; Overview; Servicing Method; Features - Hitachi VK-S274R Service Manual

Color & b/w video camera
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2

General Description

2-1 Overview

VK-S274R/S274ER is a color chassis video camera; VK-K274R/K274ER is a Black-and-white chassis
video camera: All these models incorporate an optical 22-power compact zoom lens.
Models VK-S274R/S274ER/K274R/K274ER are successor cameras to VK-S274/S274E/K274/K274E.
The signal process circuit is equipped with a digital signal processor (D.S.P.5) that is the same as
that of VK-S274/S274E/K274/K274E.
The external appearance is identical to VK-S274/S274E/K274/K274E.

2-1-1 Servicing method

Table 2-1-1 shows the method for servicing each circuit board.
Refer to "4 Troubleshooting" for the method of judging defects in each circuit board.
Information:
These servicing methods are subject to change without notice for the purpose of facilitating service
procedures.
Table 2-1-1 Circuit Board Servicing Method
Circuit board
CSR circuit board
Component replacement.
PC circuit board
SP circuit board

2-2 Features

Built-in Optical Power Zoom Lens
A highly reliable optical 22-power zoom lens is mounted, and it is equipped with auto-focus and auto
iris functions.
12-Power Digital Zoom Function
The 12-power digital zoom, combined with the 22-power optical zoom, makes possible up to 264-
power zooming.
Remote Control via RS-232C
Focus, iris and zoom can be remotely operated via RS-232C.
External Synchronization with AC-Line Pulse Signal
This chassis camera is compatible with external sync using AC-line pulse signal, as well as with
internal sync.
Servicing method
2 - 1
PC CIRCUIT
PC CIRCUIT
BOARD
BOARD
Fig. 2-1-1 Locations of Circuit Boards
SP
CIRCUIT
BOARD
CSR CIRCUIT
BOARD

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Vk-k274rVk-s274erVk-k274er