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RZ2 Tech Notes

Changing Power Supply Fuses

TN0952

Product: RZ, RZ2, RZ5, RZ5D, RZ6, RZ10, ZB1PS
Version: All
Date Added: 2015-01-22

Issue

RZ Processors and ZB1PS device chassis power supplies have fuses that can be changed by the user. This note provides step by step instructions on changing the fuses. This information can also be found in the Power and Safety guide for these devices, available on the TDT Website User Manuals page.

RZ Fuses

The RZ devices uses two 5 x 20 mm, 1.6 A 250 V rated, slow-blow fuses. Access to the fuses are through a fuse plate on the back panel.

Danger

Only fuses with the required rated current, voltage, and specified type should be used with this device.

To change the power supply fuses:

  1. Turn off the power switch and disconnect the power cord from the power supply.

  2. Using a small flathead screwdriver gently push the clip along the left side of the fuse plate to the right.

  3. When the fuse plate pops free, gently slide the fuse plate and housing out of the power supply.

  4. The housing contains two fuses. Replace the defective/broken fuse(s) with a new 5 x 20 mm, 1.6A 250V rated, slow-blow fuse by gently pushing the end of the fuse into the fuse housing.

  5. Push the fuse housing back into the power supply and press gently until the clip clicks into place.

ZB1PS Fuses

The ZB1PS devices uses two 500 mA 250 V rated time lag fuses. Access to the fuses are through fuse plates on the back panel.

Danger

Only fuses with the required rated current, voltage, and specified type should be used with this device.

To change the power supply fuses:

  1. Turn off the power switch and disconnect the power cord from the power supply.

  2. Using a flathead screwdriver, gently push the fuse plate inward.

  3. Once the fuse plate is pressed inward gently turn the screwdriver counterclockwise until the fuse plate tab is visible.

  4. Depress the fuse plate and it will pop up.

  5. Slide the fuse housing out of the power supply.

  6. Replace the defective/broken fuse with a new 500 mA 250 V rating time lag fuse by gently pushing the end of the fuse into the fuse housing.

  7. Push the fuse housing back into the power supply by pressing the screwdriver inward.

  8. Rotate the fuse plate clockwise until the fuse tab is correctly locked back into its original position.

  9. Repeat for the other fuse, if necessary.

Note

This tech note does not cover the older ZB1 model device caddie, which relies on the PS25F power supply. The PS25F uses a different fuse (printed on the faceplate).

RZ2 analog I/O fails at boot-up

TN0932

Product: RZ2
Version: All
Date Added: 2014-01-13

Issue

The RZ2 power supply uses multiple voltage rails to distribute power through the device. Because the side fan requires a large current draw on start-up, the corresponding power spike can sometimes exceed the rating for one of the voltage rails. When this occurs, the safety circuit shuts off that rail until the power is cycled on the RZ2.

The issue will present itself as:

  1. ADCs/DACs do not work**

  2. Side fan does not spin

  3. Blue LED on the power switch is not lit and the ADC and DAC indicators on the RZ2 screen show erroneous color combinations

Workaround

This is an intermittent problem. Cycle power on the RZ2 until it starts-up correctly (the blue light on the power switch comes on).

Solution

If this issue becomes persistent or problematic, contact Support for assistance.

RZ2 input sometimes produces NaNs

TN0886

Product: RZ2, RPvdsEx
Version: TDT Drivers < 72
Date Added: 2010-12-17

Issue

On rare occasions, the data pipe on the RZ2 outputs a NaN ("Not a Number"). This breaks any floating-point math that is applied to the signal, which results in garbage data or a flat line. This is most likely to occur at startup, if your circuit uses many SourceFile components.

Workaround

Add an MCBound component to the output of RZ2_Input_MC. This component will replace NaNs with zeros.

Solution

Upgrade to latest version of TDT Drivers/RPvdsEx. The RZ2_Input_MC macro has been updated to handle NaNs.

Noise on RZ Legacy Optics

TN0865

Product: RZ2, RZ5
Version: RZ2 < 3000, RZ5 < 2000
Date Added: 2009-09-28

Issue

RZ2s with serial number less than 3000 and RZ5s with serial numbers less than 2000 will sometimes boot in a state which prevents them from properly phase- locking to amplifier devices connected to the front panel legacy optical ports. Signals recorded from the front panel fiber optic ports will look like noise and the channel numbers might be shifted i.e. signals expected on one channel appear on a completely different channel.

Workaround

Cycle power on the RZ device.

Solution

If you experience this problem, contact TDT for an RMA.

Channel 256 on the PZ2-256 Preamp records erroneous data

TN0855

Product: RZ2, PZ2
Version: All
Date Added: 2009-06-02

Issue

Channel 256 on the PZ2-256 Preamp does not record correctly. The channel appears grounded or shows erroneous data.

Solution

This solution involves a reprogramming of the RZ2 firmware. If you experienced this problem, contact TDT to request an RMA.

Erroneous data read from RZ A/Ds

TN0847

Product: RZ2, RZ5
Version: RZ2 < 3000, RZ5 < 2000
Date Added: 2009-04-09

Issue

When using an RZ device, erroneous data might be read from the A/Ds. This problem can be difficult to detect and is most obvious on RZ2 devices with more than 4 DSPs but may occur on any RZ device.

Solution

If you are using the RZ A/Ds please contact TDT to request an RMA. The RZ must be returned to TDT for repair.

RZ2 zHop contains anomalous data for the first two sample cycles

TN0267

Product: RZ2
Version: Serial numbers < 2000
Date Added: 2007-10-01

Issue

Anomalous data values may be generated at the output of zHop components in the first two sample cycles of a newly run process. The initial value on the RZ zHop bus floats high (resulting in a HEX value of FFFF) during inactive cycles and may affect the circuit when the processing chain is executed on the device.

Solution

Initial startup delays associated with software applications such as OpenEx may mitigate the effect of this anomaly. If you do experience any issues related to this problem, please contact TDT and request an RMA for an upgrade to eliminate this problem.

Random noise tick on Channel 1 of RZ2 processors

TN0250

Product: RZ2
Version: intermittent devices
Date Added: 2007-04-18

Issue

Some RZ2 processors have a random noise tick on channel 1.

Workaround

Avoid using channel 1

Solution

If you experience this problem, please contact TDT to request an RMA for upgrade.

Note

This problem does not appear on all processors and has been resolved for devices built after 4/18/2007.

Buzz heard when using a PZ2-8 256-Channel Preamplifier

TN0248

Product: RZ2
Version: Serial Numbers < 7000
Date Added: 2007-03-26

Issue

A persistent buzz is heard when power is applied to the PreAmp. This indicates that the battery in use has been fully discharged.

Solution

Turn the PreAmp off and recharge the battery. Occasionally, a buzz will be heard when the battery in use is fully charged. If this is the case, turn the unit off (set the switch to center position), and then back on. This should correct the problem.

PZ2-128, PZ2-256 preamplifiers show up as PZ2-64 in RZ2 LCD display

TN0243

Product: PZ2, RZ2
Version: All
Date Added: 2007-02-28

Issue

The PZ2-128 and PZ2-256 model preamplifiers will show up as PZ2-64 in the RZ2 front panel LED display if there is not a signal source connected to the first connector in the extended channel range. This issue effects the RZ2 display only, not the actual acquisition of signals.

Solution

To display the preamplifier correctly, make sure a signal source is connected to the first channels not available on the lower model number PZ2. For example, a PZ2-128 will show up as a PZ2-64 unless there is a signal source connected to the connector labeled 65-80.

GetStatus returns incorrect information for bit-0 on an RZ2

TN0234

Product: RZ2, ActiveX
Version: Microcode version 62 and below
Date Added: 2007-01-07

Issue

GetStatus always returns a zero for bit-0 on an RZ2 with microcode v62 and below.

Solution

Update to latest version of TDT Drivers. After installing the drivers, reprogram the RZ2 with the new microcode. Keep in mind that reprogramming the microcode on an RZ processor will take about five minutes per DSP.

Note

Unlike the Medusa base station, bit-0 of the GetStatus return value is not used to report PZ amplifier status. RZ users should refer to the LCD screen for amplifier status information.

BioAmp signal fed from a DataPipe input results in erroneous data

TN0218

Product: RZ2
Version: All
Date Added: 2006-09-19

Issue

When the DataPipe is used to feed signals from the BioAmp, fixed-point-to-float conversion is required. Omitting the conversion results in erroneous data.

Workaround

The RZ2_Input_MC macro executes the necessary conversion automatically. If the macro is not used in the circuit, the user must place a MCInt2Float or Int2Float with a scale factor of 1e-9 after the PipeIn or MCPipeIn component that feeds the BioAmp signals to the circuit.

Example:

Solution

Use the RZ2_Input_MC macro provided with RPvdsEx.

Using RZ processors, BioAmp input appears clipped or larger than expected

TN0217

Product: RZ2, RZ5, RA16PA, RA4PA
Version: All
Date Added: 2006-09-19

Issue

When using the RZ2 or RZ5 processor BioAmp input from the Legacy Medusa PreAmps will appear too large or clipped unless a scale factor is applied.

Workaround

The Legacy Amp, RA16PA/RA4PA inputs must be scaled by a factor of .000833 The RZ Input Macro applies the appropriate scale factors automatically. However, if the macro is not used in the circuit, the user must use Scale Add or MCScale to ensure the scale factor is applied.

Solution

Use the RZ2_Input_MC macro for RZ2 or RZ5_AmpIn and RZ5_AmpIn_MC macros for the RZ5.

Using non TDT amplifiers

TN0140

Product: RA16BA, RX5, RX6, RX7, RZ2, RZ5
Version: All
Date Added: 2004-09-23

Issue

TDT modules that connect to amplifiers are compatible with any amplifier (including those not sold by TDT). Any TDT module with analog or fiber optic inputs can acquire signals of ± 10 V.