Maintenance
—
7623/R7623 Service
Troubleshooting
Aids
Diagrams.
Complete circuit diagrams are given on fold-
out
pages
in the Diagrams section. The component number
and
electrical value of each component in this
instrument
are
shown on
these diagrams. Each main circuit is assigned a
series
of component numbers. Table 4-1 lists
the main
circuits
in the
7623 and the series of component numbers
assigned
to each. Important voltages and
waveforms are also
shown on the
diagrams. The portions of
the circuit
mounted
on
circuit boards are
enclosed with blue lines.
Circuit Boards.
Fig. 4-2 shows the location of the circuit
boards
within the 7623; Fig. 4-3
shows the location of
circuit
boards in the R7623.
Pictures of these circuit
boards
are
shown in Figs. 6-1 through 6-11. These pictures
are
located
in the
Diagrams section on the back of the page
opposite
the circuit diagram,
to
aid the cross-referencing
between
the diagrams and the circuit-board components.
Each
electrical component
on
the boards is identified by its
circuit
number. The color and location of the inter
connecting connectors are
also shown. The circuit boards
are
also
outlined on the diagrams with a blue
line to show
which portions of the circuit are located on a circuit
board.
Component Numbers
TABLE
4-1
Component
numbers
on
diagrams
Diagram
numbers
Circuit
1-49
1
Main
Interface
50-199
2
Logic
Circuit
300-399
3
Trigger Selector
200-299
3
Vertical
Interface
400-499
4
Vertical
Amplifier
500-599
5
Horizontal Amplifier
600-699
6
Output Signals
1000-1099
7
CRT Circuit
1100-1299
8
LV Power
Supply
800-999
9
Storage Output
1300-1499
10
Storage
Logic
21002299
11
Readout
System
Multi-Pin
Connector Color-Code.
The multi-pin
connectors
used for interconnection between circuit boards
are
color-coded to aid
in
circuit tracing. The color of the
connector
body
matches
the resistor color-code for the last
digit
of
the circuit number; e.g., P601 is brown, P603 is
orange,
etc.
Wiring
Color-Code. All insulated wire and cable used in
the
7623 is color-coded to facilitate
circuit tracing.
NOTE
Color
code
of the
AC power cord
is as follows (in
accordance with
National
Electrical Code):
Black
Line
White
Neutral
Green
with yellow stripe
Safety earth (ground)
Resistor
Color-Code.
In addition to the brown composi
tion
resistors,
some metal-film resistors and some wire
wound
resistors
are
used in the 7623. The resistance values
of wire-wound
resistors
are
usually
printed on the body of
the
component. The resistance values of composition
resistors and
metal-film
resistors are color-coded on the
components
with EIA color-code
(some metal-film resistors
may have
the
value printed on the body). The color-code is
read starting
with the
stripe nearest the end of the resistor.
Composition
resistors
have four
stripes which consist of
two
significant figures, a multiplier, and a tolerance
value
(see
Fig.
4-2). Metal-film resistors
have five stripes con
sisting
of three
significant
figures, a multiplier, and a
tolerance value.
Capacitor Marking. The capacitance
values of
common
disc
capacitors and
small electrolytics are marked on the
side
of
the component body. The white ceramic capacitors
used
in the
7623 are color-coded in picofarads using a
modified EIA
code (see Fig. 4-4).
Diode
Color-Code.
The cathode end of each glass-
encased diode is
indicated
by a stripe, a series of stripes, or
a
dot.
For most silicon or germanium diodes with a series of
stripes,
the
color-code identifies the three significant digits
of the
TEKTRONIX Part Number using the resistor
color-code
system (e.g., a diode color-coded pink- or blue-,
brown-gray-green
indicates TEKTRONIX Part No.
152-0185-00). The cathode
and
anode
ends of metal-
encased
diodes can be identified by the diode
symbol
marked
on the body.
Semiconductor
Lead Configuration. Fig. 4-5
shows the
lead configuration for the
semiconductors used in this
instrument. This
view
is as seen
from the bottom of the
semiconductors.
Troubleshooting
Equipment
The following
equipment is useful for
troubleshooting
the
7623.
1.
Transistor
Tester
Description:
TEKTRONIX Type 576 Transistor-Curve
Tracer or
equivalent.
4-3
Summary of Contents for 7623
Page 1: ...MANUAL 7623 R7623 STORAGE OSCILLOSCOPE SERVICE MANUFACTURERS OF CATHODE RAY OSCILLOSCOPES ...
Page 51: ...Fig 3 2 Block diagram of Logic circuit Circuit Description 7623 R 7623 Service ...
Page 72: ...W NJ 00 Fifl 3 22 Low Voltage Power Supply detailed block diagram ...
Page 73: ...Circuit Description 7623 R 7623 Service ...
Page 74: ...CO NJ CD Fig 3 22 Low Voltage Power Supply detailed block diagram cont ...
Page 75: ...Circuit Description 7623 R 7623 Service ...
Page 97: ...Circuit Description 7623 R7623 Service 3 51 ...
Page 98: ...Circuit Description 7623 R7623 Service Fig 3 39 Output Pulses for the Storage Circuits 3 52 ...
Page 103: ...Circuit Description 7623 R7623 Service 3 57 ...
Page 108: ... Ç À Fig 4 2 Location of circuit boards in the 7623 ...
Page 109: ...Fig 4 3 Location of circuit boards in the R7623 Maintenance 7623 R 7623 Service ...
Page 113: ...Maintenance 7623 R7623 Service Fig 4 6 Circuit Isolation Troubleshooting Chart 4 9 ...
Page 165: ...7623 BLOCK DIAGRAM ...
Page 166: ...7623 R7623 Service Front of Board ...
Page 167: ......
Page 168: ...FL ...
Page 169: ......
Page 173: ...7623 Logic ...
Page 175: ...Vertical Interface A4 ...
Page 178: ...Vertical Interface ...
Page 180: ...Vertical Amp A5 ...
Page 184: ...Horizontal Amp A6 ...
Page 186: ...7623 TO P450 VERT AMP 3 HORIZONTAL AMPLIFIER ...
Page 188: ...Output Signals A7 ...
Page 190: ...FROM 7G23 Output Signals g ...
Page 195: ...FROM LV POWER SUPPLY 7623 CRT CIRCUIT ...
Page 197: ......
Page 200: ......
Page 202: ...Storage Output A14 ...
Page 204: ......
Page 205: ...7623 R7623 Service Fig 6 14 A15 Cal Storage circuit board ...
Page 208: ......
Page 209: ...7623 R7623 Service Fig 6 15 A16 Readout System circuit board ...
Page 213: ......
Page 242: ...7623 R7623 OSCILLOSCOPE b ...
Page 243: ...151 ...
Page 246: ...20 ...
Page 247: ...7623 R7623 OSCILLOSCOPE 112 ...