Adjusting the Volume of the DECT Cordless Phone

This Tech Tip will demonstrate how to make volume adjustments to an individual NEC DECT Cordless Phone (DTZ-8R-1), if the volume is too low or too high on either the transmit or receive audio.

Instructions

The audio gain (TX + RX) on the NEC DTZ-8R-1 cordless phone is set to 0 db by default. If the volume is too low or too high on either the transmit or receive side, you can adjust the gain on the individual handset.

1. Press the Mute/Menu key (located under the 4th line key).
2. Press the following keys consecutively on the numeric keypad: 1, 2, 3, #
   • The “Service Menu” will now be displayed on the LCD screen.
3. Press the Down Arrow until the arrow is to the left of Audio Gain Offset
   (displayed as >Audio Gain Offset)
4. Press the Select button (center button between the directional arrows) to select Audio Gain Offset.

Default setting for both Transmit and Receive Gain is 0 dB.

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Modifying TX Gain (Transmit Volume)

• Press the Up or Down Arrow to select a TX level:
  • Options: +6, +4, +2, -2, -4, -6

⚠️ Tip: The -6 level has been effective at resolving echo issues.

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Modifying RX Gain (Receive Volume)

• Press the Right Arrow, then use the Up or Down Arrow to select a RX level:
  • Options: +6, +4, +2, -2, -4, -6

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Saving Your Changes

1. Press the Select/Enter button to confirm the new gain settings.
2. Press the key below the word Back repeatedly until you return to the Home Screen.