The TEC-5600 platform: five models, options, boards and units, self-tests and the status indicator

Identify which TEC-5600 model and options are on the bench, name the board or unit behind each function from the control dial to the HV capacitor, and explain what the self-tests and the status indicator prove and what they leave to you.

One chassis, five model numbers

The Cardiolife TEC-5600 series is one hardware platform sold under five model numbers. They share the case, the MOTHER board, the HV section, the keypad and the display, and differ in which therapy electrodes they accept, whether they have an AED mode, lead ECG, a recorder and a pacer. Learn the split, because the model number decides which checks apply, which spare parts fit and which messages you can expect.

The TEC-5601 is the simplest: a manual defibrillator with external paddles and no AED, no lead ECG monitoring, no recorder and no synchronised cardioversion. ECG comes only through the paddles. The TEC-5602 is the same manual paddle unit with lead ECG, a recorder and synchronised discharge added. The TEC-5611 is the pads-only model: it has AED mode, lead ECG, recorder and sync, and it takes disposable pads directly on its therapy connector, without external paddles. The TEC-5621 carries external paddles as standard, accepts internal paddles and, through the JC-865V pad adapter, disposable pads, and has AED, lead ECG, recorder and sync. The TEC-5631 is the TEC-5621 plus transcutaneous pacing.

Across the whole range the manual lists as options the SD card, the NKB-301V battery pack, the Bluetooth module and the SpO2 and CO2 measurement. There is no non-invasive blood pressure on this series in the service manual we used, so if a ward asks you to 'check the NIBP' on a TEC-5600, it is either a different device or a misunderstanding. Voice prompts and sound recording through a built-in microphone are standard on every model. Some model numbers also exist in a European variant with paddles and electrode assemblies marked for ERC-compatible use; the parts list separates them, so note the exact variant from the label.

Record the configuration before you touch anything

Start every job by writing down the model number, the serial number, the software versions shown in the device information screen, and what is physically present. The items that change the inside of the unit are: the pacer (TEC-5631 only), the QI-564V multi-parameter/SpO2 unit for SpO2 and CO2, the QI-832V Bluetooth module, the battery pack and the SD card. Note which therapy electrodes the ward actually uses: external paddles, internal paddles of which size and with or without switch, disposable pads through the pad adapter, or pads directly on a TEC-5611.

The manufacturer asks that parts be ordered by the code number and part name from the service manual together with the model of the unit the part goes into. The HV unit is the clearest example: the pacing model uses a different HV unit from the other models, and the paddle connector board exists in a paddle version and a pads version. Ordering 'an HV unit for a TEC-5600' is how you receive the wrong one.

Finally ask about data. The unit keeps defibrillation, alarm, event and VF analysis reports, trend and periodic lists, a self-test report, an operation history and a maintenance report. Some checks and every MOTHER board replacement can lose part of this, so the ward must confirm that any record they need has been printed or saved to an SD card before you start. This is covered again in lessons 3 and 5.

Inside: the MOTHER board and the boards around it

The UR-0481 MOTHER board is the controller. It carries the main CPU and several companion processors, the memory that holds settings, reports and the error history, the real-time clock with its backup battery, the SD card interface and the link to every other board. Its software is split between several CPUs, which is why the communication error group names processors such as the sub CPU, the SV-CPU and the SSV-CPU. Two small sub batteries sit on it; one keeps the clock. When the printed date jumps back to a default or the clock is lost, look here first.

The front case holds the UR-0488 KEY/LED board with its own CPU, the membrane switch, the UR-0505 rotary switch behind the control dial, the UR-0493 ALARM IND board, the 6.5-inch colour LCD, the speaker and the microphone. On the TEC-5631 the UR-0475 PACER KEY board adds the pacing keys. The KEY/LED board matters more than its name suggests: the harness from the therapy connector that tells the unit whether paddles or pads are plugged in runs to it, and the manual sends several 'connect paddles' faults there.

The UR-0480 L-ECG unit (all models except the TEC-5601) is the lead ECG front end with its own CPU. The UR-0476 OP-CONN board carries the option connectors. The QI-564V multi-parameter/SpO2 unit, when fitted, contains the MP/SpO2 board and the SpO2 board. The recorder is the WS-561V recorder unit with its RG-561X paper drive and the UR-0486 REC board. The UR-0489 PACER board, TEC-5631 only, generates the pacing pulse under its own CPU. Power comes from the AC/DC unit and, when fitted, the NKB-301V pack.

The HV section: HV DRIVE board, biphasic HV unit and the paddles

The therapy core is two assemblies. The UR-0483 HV DRIVE board takes commands from the MOTHER board and controls charging and the switching of the output. The biphasic HV unit holds the high-voltage capacitor, the output switch and the circuits that measure the charge, and sits in the area the connection diagram marks as floating at high voltage. The unit produces a truncated exponential biphasic waveform, measures the patient's transthoracic resistance and the delivered energy, and adjusts the waveform over the load range the manual specifies. The HV unit is replaced as a unit; nothing inside it is a field part.

Remember what this block is from a safety point of view. While charged, or after a fault, it can hold enough energy to kill you. Lesson 5 deals with it in detail; here it is enough that the HV unit and the HV DRIVE board are opened only to remove or fit them by the manufacturer's procedure, never to probe a live circuit.

The therapy electrodes connect through the paddle connector on the case. External paddles park in a holder whose cups contain test electrode plates on springs, wired to a test load, so a shock can be dumped safely during checks. The paddle contact lamp on the paddles shows contact resistance in three colours. Internal paddles are limited to a low maximum energy. Disposable pads go through the JC-865V pad adapter on the paddle models, and directly on the TEC-5611. AED mode and pacing work only with pads, which the unit enforces with its own messages.

Self-tests, basic checks and the status indicator

The unit tests itself automatically when it is switched on and off, when the power cord is connected or removed, every day and every month. If any test finds a fault, the status indicator turns from a green circle to a red cross. The indicator is also red while a test is running. The latest result is kept and can be viewed in the system setup, and the maintenance report keeps the history.

The BASIC CHECK position on the control dial starts a separate, user-run sequence meant to be done every day. It checks the SD card, the paper and the recorder, looks at the error history, identifies the connected paddles or pads, charges and discharges a low energy into the paddle holder test load or into an analyser, checks the pacer output on the TEC-5631, reads the battery state and expiry, and asks the user to confirm the status indicator, the voice, the alarm sounds and lights. It also checks communication with the L-ECG unit, the multi-parameter unit and the Bluetooth module when fitted. The window shows when the last basic check and the last battery test were done and highlights them when they are overdue.

Two limits matter. First, the basic check and the self-tests prove that the circuits respond, not that the unit delivers the right energy into a realistic load at clinical levels, that sync timing is correct or that the pacer current is accurate. That is the monthly and annual work with an analyser in lesson 2. Second, a red indicator is a reason to take the unit out of clinical service and find out why. The manual itself notes that the indicator can stay red after a repair such as a speaker replacement even when the basic check passes, and it describes how to let the scheduled monthly self-test run and turn it green. The point of that procedure is that a real test runs and passes; any route to a green indicator that skips the test is forbidden.

What this course assumes

You passed the Level 1 defibrillator course and know how a biphasic unit charges, stores and delivers energy, why delivered energy depends on load, and how an analyser is used. This course does not repeat that. It gives you the TEC-5600 map: which board each message points to, which checks the manufacturer expects and at what interval, and how a board is changed and the unit released without losing settings, adjustments or safety. Keep the service manual and the operator's and administrator's guides for your revision at hand; this course explains and orders the work, the documents give the steps and the limits.

On-site checklist

• Model number (5601, 5602, 5611, 5621, 5631), European variant or not, serial number and software versions recorded
• Fitted options recorded: QI-564V SpO2/CO2, QI-832V Bluetooth, battery pack, SD card
• Therapy electrodes in use: external paddles, internal paddles (size, switch), pads via JC-865V or direct on TEC-5611
• Status indicator colour and date of last basic check and last battery test noted
• Ward confirmed that needed reports and records were printed or saved to SD card
• Parts ordered by code number, part name and the model they go into

Check yourself