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1405
BK Precision 1405 User Manual
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TROTIBLESHOOTING
OPERATIONAL
CHECK
TROUBLESHOOIING
U
18.
Return
NOR-DIR
switeh
to
NOR.
Apply
Cheek
R164,
elzl.
60
Hz
signal
of
at
least
25
V
p-p
to both
Z-AXIS
INPUT
terminal
and
VERT
INPUT
jaek.
Adjust
for
synehronized
display
of
a
f
ew
eyeles.
Displayed
waveform
should
be
intensity
modulated.
TROUBLESHOOITNG
NOTES
23
26
28
Table of Contents
Safety
2
Table of Contents
4
Reference Publications
4
Introduction
5
Description of Equipment
5
Specifications
6
Controls and Indicators
7
Front Panel Controls and Indicators
7
Bottom Panel Controls
8
ATT Switch
8
Gain Control
8
Position Control
8
Rear Panel Controls
9
Intensity Control
9
Focus Contorl
9
AXIS Terminal
9
Circuit Description
10
Block Diagram Analysis
10
Vertical Channel Circuits
10
Input Circuit
10
Vertical Preamplifier
11
Block Diagram
11
Vertical Final Amplifier
11
Horizontal Channel Circuits
12
Sweep Generator
12
Sync Circuit
13
Vertical Channel Circuits, Simplified Diagram
13
Low Voltage Power Supply
14
FET Buffer
14
Horizontal Amplifier
14
External Horizontal Operation
14
Horizontal Channel Cireuits, Simplified Diagram
15
Sweep Generator Cireuit Diagram and Waveforms
15
Adjustments
17
Adjustment of DC Balance
17
Locations of Adjustments
17
Adjustment of Horizontal Gain
17
Trace Rotation Adjustment
18
SWEEP VARI/EXT Gain
18
Effects of HOR Gain Adjustment
18
Alternate Method
18
Frequency Compensation Adjustments
19
Maintenance
21
Case Removal
21
Fuse Replacement
21
Line Voltage Conversion
22
CRT Removal and Replacement
22
Front Panel Removal
22
Troubleshooting
24
Operational Check
24
Parts List
28
Schematic
29
Voltage Chart
33
Transistor Voltages
33
CRT Voltages
33
History of Production Changes
36
Service Hints
37
Modification to Add Retrace Blanking
37
Adapting 1403A or 1405 to Use Standard Oscilloscope Probe
38
4
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BK Precision 1405 Specifications
General
Brand
BK Precision
Model
1405
Category
Test Equipment
Language
English
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