Tektronix TDS2022C Service Manual

Maintenance
1. Remove the rear
case. (Seepage58,Rear Case.)
2. Check that the coaxial connections to the back side of the BNC connectors are
intact. Use the DMM to measure continuity from the front side of the BNC
connector to the point where it attaches to the Main board.
NOTE. Th e ground side of the BNC has thre
e connections (two mounting lugs
and one signal wire) while the center connection has one. Incomplete or p oor
connection of the ground side may cause AC signal quality problems without
affecting D C measurement capability.
3. If no problem is found and the trouble p ersists, the Main board is probably
defective in some way that the internal diagnostics cannot detect. Replace it.
Troubleshooting the USB
Interface
To troubleshoot the USB interface, if the acquisition is working, and the USB is
not, replace the M ain board.
Using the Error Log
Failures that o ccur during the power-up diagnostics or normal oscilloscope
operation place an entry in the error log.
Accessing the error log. The error log list can be accessed anytime by pushing the
UTILITY button and selecting E r ror Log.
The following table lists the error codes and probable cau ses. (See Table 26.)
Table 26: List of error codes
Error code Description Probable cause
0 DI Diagnostics internal error
Contact Tektronix
1DI
ADG522 diagnostics failed Main board or power supply failure
2DI
PROM diagnostics failed Main board or power supply failure
3DI
MEMORY diagnostics failed Main board or power supply failure
4DI
Ch 1 diagnostics failed Main board or power supply failure
5DI
Ch 2 diagnostics failed Main board or power supply failure
6DI
Line trigger diagnostics failed Main board or power supply failure
7DI
ADG421 diagnostics failed Main board or power supply failure
12 DI
Ch 3 diagnostics failed Main board or power supply failure
13 DI
Ch 4 diagnostics failed Main board or power supply failure
14 DI
ADG421 #2 diagnostics failed Main board or power supply failure
15 DI
ADG522 #2 diagnostics failed Main board or power supply failure
16 DI
DRAM2 diagnostics failed Main board or power supply failure
17 DI
USB diagnostics failed Main board or power supply failure
255
Software Contact Tektronix
TDS2000C and TDS1000C-EDU Series Oscilloscope Service Manual 81

Tektronix TDS2022C Specifications

General

Bandwidth	200 MHz
Sample Rate	2 GS/s
Channels	2
Record Length	2.5 kpoints
Timebase Range	5 ns/div to 50 s/div
Math Functions	Add, Subtract, Multiply, Divide, FFT
Input Coupling	AC, DC, GND
Vertical Resolution	8 bits
Trigger Modes	Auto, Normal, Single
Memory Depth	2.5 kpoints
Display	5.7-inch color LCD
Input Impedance	1 MΩ
Trigger Types	Edge, Pulse, Video
Display Resolution	320 x 240 pixels
Connectivity	USB
Automatic Measurements	Frequency, Period, Rise Time, Fall Time
Power Supply	100-240 VAC
Time Base	5 ns to 50 s