Leader LBO-51MA User Manual

LBO-51MA
DISPLAY
SERVICE MANUAL
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NOTE
These servicing instructions are for use by
qualified personnel only. To avoid electrical
shock, do not perform any servicing other than
that contained in the service manual unless
you are qualified to do so.
********************************

Leader LBO-51MA Specifications

General

Brand	Leader
Model	LBO-51MA
Category	Monitor
Language	English

Summary

SPECIFICATIONS

Vertical and Horizontal Amplifiers

Details deflection sensitivity, accuracy, bandwidth, rise time, linearity, and input coupling for vertical and horizontal amplification.

Physical and Environmental Data

Covers power requirements, consumption, dimensions, weight, operating, and storage temperatures of the instrument.

TEST EQUIPMENT REQUIRED

CALIBRATION PROCEDURE

General

Outlines general calibration requirements, warm-up period, and safety precautions for servicing.

Initial Control Settings

Specifies the initial settings for various controls prior to performing calibration adjustments.

Power Supply

Details the procedure for checking and adjusting the internal power supply voltages.

Display

Covers the adjustments for intensity and focus to achieve optimal CRT display clarity.

Y-AXIS

Details bias, DC balance, sensitivity, and frequency response adjustments for the Y-axis amplifier.

X-AXIS

Details bias, DC balance, sensitivity, and frequency response adjustments for the X-axis amplifier.

X-Y PHASE adjustment

Explains the procedure for adjusting the X-Y phase to ensure proper display alignment.

Z-AXIS

Covers the adjustment procedure for the Z-axis input and frequency response.

TROUBLESHOOTING PROCEDURE

Troubleshooting Aid-1

General checks including equipment, control settings, visual defects, and initial adjustments.

Troubleshooting Aid-2

Focuses on checking major oscilloscope sections: HV power supply, Y-axis, and X-axis amplifiers.

Troubleshooting Aid-3

Provides systematic steps for diagnosing issues like no spot, axis deflection, or low sensitivity.

ADJUSTMENT LOCATIONS

Right side view

Diagram illustrating the locations of adjustment controls and test points on the right side.

Left side view

Diagram illustrating the locations of adjustment controls on the left side of the unit.

PRINTED CIRCUIT BOARD (Component side view)

T-2510 Main board

Component layout diagram for the main T-2510 printed circuit board.

T-2511 X, Y pre-amplifier board

Component layout diagram for the T-2511 X, Y pre-amplifier printed circuit board.

T-2512 CRT control board

Component layout diagram for the T-2512 CRT control printed circuit board.

T-2513 X, Y control board

Component layout diagram for the T-2513 X, Y control printed circuit board.

BLOCK DIAGRAM

SCHEMATIC DIAGRAM

Power supply

Schematic diagram illustrating the power supply circuit of the LBO-51MA instrument.

CRT and Z-AXIS amplifier

Schematic diagram for the CRT and Z-AXIS amplifier sections of the oscilloscope.

X, Y pre-amplifier

Schematic diagram for the X, Y pre-amplifier circuit board (T-2511).

X, Y final amplifier

Schematic diagram for the X, Y final amplifier circuits.

PARTS LIST

T-2510 Main board Parts

List of components, including resistors, diodes, and ICs, for the T-2510 main board.

T-2511 X, Y Pre-Amp Board Parts

List of components for the T-2511 X, Y pre-amplifier board, including resistors and capacitors.

CABINET REMOVAL