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RZ5 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).

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.

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.

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.