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For a Sony DAV-DZ310 that is not responding normally, start by unplugging its AC power cord for several minutes and reconnecting it. If that does not help, Sony’s broader cold reset is performed with the system on: press N, FUNCTION, and /1 (power) together on the main unit. The front panel should display “COLD RESET.” This reset can erase saved system settings, so use the narrower DVD setup reset if you only want to restore setup values.
Choose the right reset for the problem
The DAV-DZ310 offers three different recovery options. A power cycle interrupts power without intentionally restoring settings; the DVD menu’s [RESET] option restores selected setup values; the cold reset restores broader system parameters. Sony’s DAV-DZ310 manuals listing provides the model’s operating instructions, which describe these procedures.
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| Option | What it does | When to use it | What to expect |
|---|---|---|---|
| Power cycle | Disconnects and reconnects AC power; it is not described as a settings reset. | The system does not work normally and you want to try the preliminary step in Sony’s manual. | Wait several minutes before reconnecting. If the problem remains, try a cold reset. |
| DVD setup [RESET] | Returns [SETUP] settings to default, except [PARENTAL CONTROL]. It also returns [MEDIA], [INTERVAL], [EFFECT], and [MULTI/2CH] to their defaults. | You can use the DVD setup menus and want to reset those values rather than broader system parameters. | Do not turn off the unit while the reset is in progress; it takes several seconds. |
| Cold reset | Restores broader system parameters, including preset stations, to defaults. | The system remains abnormal after a power cycle, or a broader settings reset is needed. | Use the main unit’s button combination. Expect to restore personal settings such as presets. |
How to power cycle the DAV-DZ310
- Turn the system off if it is on.
- Unplug the AC power cord from the wall outlet.
- Wait several minutes, then reconnect the power cord.
- Turn the system on and check whether it works normally.
If it is still malfunctioning, Sony’s manual directs users to the cold-reset procedure.
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How to perform a cold reset
- Turn on the DAV-DZ310.
- On the main unit, press N, FUNCTION, and /1 (power) at the same time. Use the controls on the unit rather than trying to perform the simultaneous press with a remote.
- Confirm that the front panel displays “COLD RESET.”
Sony’s operating instructions say that system parameters, including preset stations, return to their default settings. You may need to set up the system again to your preferences. The manual describes a user reset; it does not say that a cold reset repairs a hardware fault.
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- ALLIMITY RM-ADU047 Replacement Remote Control Compatible with Sony DVD Home Theatre System.
- Compatible with Below Knowing Device Models (Not all): DAV-DZ310 DAV-DZ510 DAV-DZ610 DAV-DZ810 DAV-DZ340K DAV-DZ640K DAV-DZ840K DAV-DZ940K DAV-DZ290K DAV-DZ390K DAV-DZ690K DAV-DZ790K DAVDZ310 DAVDZ510 DAVDZ610 DAVDZ810 DAVDZ340K DAVDZ640K DAVDZ840K DAVDZ940K DAVDZ290K DAVDZ390K DAVDZ690K DAVDZ790K
- Guidelines for Remote Control: 1) Point your remote control directly at the IR sensor located on your unit. 2) Make sure that no objects are blocking the path between the remote control and the IR sensor on your unit. 3) If you are having problems with the remote control, reinsert or replace your Brand New Alkaline batteries and make sure that they are correctly inserted.
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How to use the DVD setup [RESET] option
Choose this menu option when you want to restore the DVD setup values without using the broader cold reset. Open the DVD setup menus and select [RESET] in [SETUP]. The menu option restores [SETUP] settings to default except [PARENTAL CONTROL], and also resets [MEDIA], [INTERVAL], [EFFECT], and [MULTI/2CH]. Do not switch off the system during the several seconds the reset takes.
What to do if “PROTECTOR” appears
If “PROTECTOR” and “PUSH POWER” alternate, treat the message as a warning to check the system rather than as a prompt to reset it. Sony’s operating instructions advise turning the system off and waiting until “STANDBY” disappears, then checking for short-circuited speaker cords and blocked ventilation holes.
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- HBD-DZ175 HBD-TZ135 HBD-TZ210 HBD-TZ510 HBD-TZ530 HCD-DZ310 HCD-DZ510 HCD-DZ610 HCD-TZ715 RMADU079
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- Turn the system off and wait for “STANDBY” to disappear from the display.
- Check whether any speaker cords are short-circuited and whether ventilation holes are blocked.
- If you find a problem, correct it and turn the unit on again.
- If the cause is unclear or the warning persists, consult a Sony dealer.
When to contact Sony service
- “LOCKED” with a disc that will not eject: Sony says to contact a Sony dealer or authorized service facility.
- A self-diagnosis code beginning “E XX”: Contact a Sony dealer or authorized service facility and provide the five-character service number shown by the system.
- A persistent “PROTECTOR” warning: If checking wiring and ventilation does not resolve it, ask a Sony dealer to diagnose the system.
These issues are not presented in the operating instructions as problems a settings reset will fix. Avoid service-manual test-mode procedures; the consumer cold reset above is the relevant user reset.
Manuals and remote-control details
Sony Asia lists English operating-instruction PDFs dated 12 March 2010 and 18 November 2009 on its DAV-DZ310 manuals page. Sony India’s specifications page identifies the model as a DVD home theater system and lists HDMI output, USB, FM radio, and a five-speaker-plus-subwoofer configuration; those features do not change what the reset procedures do.
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- 120 days warranty. No programming required. Battery type : 2XAA. Batteries are not contained in the package.
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- Compatible with Sony DAV-DZ170 HBD-DZ170 DAV-TZ140 DAV-TZ230 DAV-TZ210 DAV-TZ510 DAV-TZ630 DAV-DZ175 DVD Home Theater AV System
Sony lists the RM-ADU047 among the components included with the DAV-DZ310, while noting that included components may vary by country or region. If the original remote is missing or faulty, check the exact remote designation and regional compatibility before buying an RM-ADU047 replacement remote; a remote is not required for the cold-reset button combination.
Sony India’s support page displayed no downloads for the DAV-DZ310 when checked on 7 October 2026. That availability can change, so check Sony’s regional support page for current manuals or service information.
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- Brand new. No Programming Required.
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- works for Sony DVD Home Theater System: DAV-TZ710 HBD-DZ170 HBD-DZ171 HBD-DZ175 HBD-TZ135 HBD-TZ530 HCD-TZ715 HCD-DZ310 HCD-DZ510 HCD-DZ610 DAV-DZ170 DAV-DZ171 DAV-DZ175 DAV-TZ210 RM-ADU079 1-487-641-11
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- No programming or paring needed.Just install new batteries and it is ready for use.
- Power Supply: 2X 1.5V AA Alkaline Battery. Batteries and manual are not included.
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