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I am getting the diagnostic error code E1A11 on my CSA803 or 11800-series oscilloscope. What does this mean?
Subject: Troubleshooting | Published: October 2026 | FAQ ID: KB-03880Viewing expanded preview
Question: I am getting the diagnostic error code E1A11 on my CSA803 or 11800-series oscilloscope. What does this mean?
Answer: This diagnostic error code indicates a problem with U500, the Numeric Processor Extension. The value returned of a pre-determined equation was not within +0.005 of the expected value.
Due to the age of these products, replacement parts are no longer available.
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I am trying to install my TekBench AMS license but when I select "Activate" it says "Activation code invalid".
Model: TEKBENCHFL-BAS | Subject: Software / Firmware | Published: October 2026 | FAQ ID: KB-01281Viewing expanded preview
Question :
I trying to install my TekBench AMS license but when I select "Activate" it says "Activation code invalid".
Answer :
If you are installing an AMS license, use the "Install" button to install the AMS license. The "Activate" button is only for use internally by Tektronix and is not used when installing AMS licenses.
Product Series: TekBench™ Control Software for Oscilloscopes and Arbitrary function generators
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I am getting the diagnostic error code D1XXX (D1111+ D1121+ D1211+ D1221) on my CSA803 or 11800-series oscilloscope. What does this mean?
Subject: Troubleshooting | Published: October 2026 | FAQ ID: KB-03881Viewing expanded preview
Question: I am getting the diagnostic error code D1XXX (D1111+ D1121+ D1211+ D1221) on my CSA803 or 11800-series oscilloscope. What does this mean?
Answer: D1111 and D1211 indicate problems with ROM, U140. The device is either not in the socket, the socket has failed, or the checksum does not match.
Error codes D1121 and D1221 indicate problems with U150. The device is either not in the socket, the socket has failed, or the checksum does not match.
Due to the age of these products, replacement parts are no longer available.
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I am getting the diagnostic error code+ E532X (E5321+ E5322+ E5323+ E5325) on my CSA803 or 11800-series oscilloscope. What does this mean?
Subject: Troubleshooting | Published: October 2026 | FAQ ID: KB-03873Viewing expanded preview
Question: I am getting the diagnostic error code+ E532X (E5321+ E5322+ E5323+ E5325) on my CSA803 or 11800-series oscilloscope. What does this mean?
Answer: Diagnostic error code E532X, indicates that during the power up self-test, the Executive Processor did not receive the expected pattern from Timebase board. This indicates a HW problem on either the Timebase or Executive Processor board.
Due to the age of these products, replacement parts are no longer available. Repairs on these products are available from Tektronix Service on a best effort basis.
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I am getting the diagnostic error code+ E1411+ E1421+ or E1431+ on my CSA803 or 11800-series oscilloscope. What does this mean?
Subject: Troubleshooting | Published: October 2026 | FAQ ID: KB-03875Viewing expanded preview
Question: I am getting the diagnostic error code+ E1411+ E1421+ or E1431+ on my CSA803 or 11800-series oscilloscope. What does this mean?
Answer: E1411 indicates a problem with the battery, or it associated circuitry. E1421 and E1431 indicate problems with U230 and/or U530, which are the NVRAM devices.
Due to the age of these products, replacement parts are no longer available. Tektronix Service offers repairs on these products on a best effort basis.
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I am getting the diagnostic error code+ E11XX (E1111+ E1112+ E1121+ E1131+ E1132+ E1141+ E1142+ E1151+ E1152+ E1161+ E1162+ E1171+ E1181+ or E1182) on my CSA803 or 11800-series oscilloscope. What does this mean?
Subject: Troubleshooting | Published: October 2026 | FAQ ID: KB-03876Viewing expanded preview
Question: I am getting the diagnostic error code+ E11XX (E1111+ E1112+ E1121+ E1131+ E1132+ E1141+ E1142+ E1151+ E1152+ E1161+ E1162+ E1171+ E1181+ or E1182) on my CSA803 or 11800-series oscilloscope. What does this mean?
Answer: These diagnostic codes indicate a problem with one, or more, of the EPROM’s. This IC could be missing, not properly seated in its socket, or defective. Below is a table matching the EPROM’s to their respective diagnostic codes:
U800: E1111, E1112
U900: E1121, E1122
U810: E1131, E1132
U910: E1141, E1142
U820: E1151, E1152
U920: E1161, E1162
U830: E1171, E1172
U930: E1181, E1182
Due to the age of these products, replacement parts are no longer available.
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I am getting the diagnostic error code E23XX (E2311+ E2321+ E2331+ E2341) on my CSA803 or 11800-series oscilloscope. What does this mean?
Subject: Troubleshooting | Published: October 2026 | FAQ ID: KB-03878Viewing expanded preview
Question: I am getting the diagnostic error code E23XX (E2311+ E2321+ E2331+ E2341) on my CSA803 or 11800-series oscilloscope. What does this mean?
Answer: This diagnostic error code indicates that one or more Row Receptors (E2311, E2331), or Column Receptors (E2321, E2341) do the sense the corresponding emitter. These emitters and receptors provide the touch screen feature of these products.
This problem may be resolved by cleaning the display including the sides where the sensors and emitters are located. Please refer to the service manual for cleaning instructions.
Due to the age of these products, replacement parts are no longer available. Repairs on these products are available from Tektronix Service on a best effort basis.
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I am getting the diagnostic error code E24XX (E2411+ E2412+ E2421+ E2422) on my CSA803 or 11800-series oscilloscope. What does this mean?
Subject: Troubleshooting | Published: October 2026 | FAQ ID: KB-03877Viewing expanded preview
Question: I am getting the diagnostic error code E24XX (E2411+ E2412+ E2421+ E2422) on my CSA803 or 11800-series oscilloscope. What does this mean?
Answer: These diagnostic error codes indicate a problem with the Upper Knob (E2411, E2412) or the Lower Knob (E2421, E2422) circuitry.
Due to the age of these products, replacement parts are no longer available. Repairs on these products are available from Tektronix Service on a best effort basis.
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I am getting the diagnostic error code+ E16XX+ E17XX+ E18X1+ or E1911 on my CSA803 or 11800-series oscilloscope. What does this mean?
Subject: Troubleshooting | Published: October 2026 | FAQ ID: KB-03874Viewing expanded preview
Question: I am getting the diagnostic error code+ E16XX+ E17XX+ E18X1+ or E1911 on my CSA803 or 11800-series oscilloscope. What does this mean?
Answer: These diagnostic error codes indicate a HW problem with the Timer, or associated circuitry on the Main Processor board.
Due to the age of these products, replacement parts are no longer available. Repairs on these products are available from Tektronix Service on a best effort basis.
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I am getting the diagnostic error code+ E1311 or E1312+ on my CSA803 or 11800-series oscilloscope. What does this mean?
Subject: Troubleshooting | Published: October 2026 | FAQ ID: KB-03863Viewing expanded preview
Question: I am getting the diagnostic error code+ E1311 or E1312+ on my CSA803 or 11800-series oscilloscope. What does this mean?
Answer: These diagnostic codes indicate a problem with either U530, or U531, which are RAM devices. Due to the age of these products, replacement parts are no longer available.
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