PIONEER VSX-516 AV RECEIVER PROTECTION MODES AND SOFTWARE UPDATE

PIONEER VSX-516 AV Receiver protection modes and software update

PIONEER VSX-516

DC-abnormality detection
DC detection is only enabled 2 seconds after power-on.
If there is a fault in the power amplifier or a high-level signal lower than 5 Hz is input, the DC_DET port becomes “L”.
If the “L” is detected, the microprocessor will perform as following flow chart.
In the case of simultaneous detection with the overload protection circuit,
DC-abnormality detection is performed preferentially to overload detection.

However, when the following keys are pushed so that the key input of a line and the service can be carried out, power can be on.
1. TESTMODE ON (A55F+A55F)
2. When power off, push FRONT ENTER key + ADVANCED SURROUND key continuously 2sec.
(2: When a DC abnormality is detected and the power is shut off.)
Any other key input from front panel or remote control will not be detected.

Overload detection

If the speaker terminals are short-circuited or low-load driving is detected, the OL_DET port becomes “L”.
If the “L” is detected, the microprocessor will perform as following

When an overload is detected, A.MUTE* is turned on, speaker relay is turned off, then "OVERLOAD" flashes on the display.

The abnormality continues for 3 seconds.

The power is shut off.

The power is shut off even if the unit recovers.

XPROTECT detection

XPROTECT is started to be monitored 200msec after power on.
XPROTECT port is checked every 20msec.
If Low level (ERROR) is recognized during consecutive 9 times, micon judge it as XPROTECT ERROR.
It processes more preferentially than DC abnormal detection and overload detection.

POWER ON

When 200 msec passed after power on, the XPROTECT detection starts. Don't detect it during power off.

If micon detect XPROTECT = Low for 200 msec, it judge as error, and then AMUTE on, speaker relay off and shut down power supply immediately.

However, when the following keys are pushed so that the key input of a line and the service can be carried out, power can be on.
1. TESTMODE ON (A55F+A55F)
2. When power off, push FRONT ENTER key + ADVANCED SURROUND key continuously 2sec.
(Effective, only when power-off is carried out by DC detection / XPROTECT detection) Any other key input from front panel or remote control will not be detected.

Fan stop detection operation flow in the DC abnormality detection
If the fan is forcibly stopped, the 'DC PROT' port becomes "L". Then an abnormality of fan is detected.

When an abnormality of fan is detected, A.MUTE* is turned on, speaker relay is turned off, the "AMP_ERR" flashes on the display.

The abnormality continues for 3 seconds.

The power is shut off.

However, when the following keys are pushed so that the key input of a line and the service can be carried out, power can be on.
1. TESTMODE ON (A55F+A55F)
2. When power off, push FRONT ENTER key + ADVANCED SURROUND key continuously 2sec.
(Effective, only when power-off is carried out by DC detection)

AMPLIFIER FAILURE DIAGNOSIS FLOW CHART

Amplifier failure diagnosis flow chart
When DC detection is activated ("AMP_ERR" flashes on the display), failure (damage) of the power amplifier section is considered.
As DC detection and fan stop protection circuits commonly use same abnormality detection port in microprocessor, please make sure that the operation of fan motor is in normal condition before proceeding to the troubleshooting of amplifier.
Caution:
When releasing the lock state of power key before repair, please be careful because there is the possibility that more damages will occur when turning on the power once again!
# According to a symptom, perform the following confirmation beforehand.
1) Is the operation of fan motor in normal condition?

2) Are there any Fuses and IC protectors open?

3) After turn on the power, confirm that the supply voltage of the point that can be measured is appropriate. (Particularly the supply voltage of the power Tr and drive step)

4) Whether the voltage of pin3 of IC600, IC601, IC602 or IC603 is equal to (VL-0.7V). If not (eg, equal to VH), then change the corresponding power pack IC600, IC601, IC602 or IC603.

5) Furthermore, check the output DC voltage of each channel of power pack IC600, IC601, IC602 and IC603 to limit the failure channel and identify the defect power pack.

# After identify the failure channel, check that each part is not damaged (resistor, diode... etc. value / open / short)

How to Update the Firmware

Explanation
With this unit, updating of the firmware of the USB module can be performed, using a USB memory stick. However, if the hardware of the flash memory that stores the firmware or the firmware itself has a problem, updating cannot be performed in a manner described below. In such a case, replacement of the flash memory is required.
Procedures
1. Turn the unit on then set the function setting to USB function.
2. Insert the USB memory stick that contains the "player.rom" file.*
3. "LOADING" is indicated on the FL display.
4. "UPDATE" is indicated on the FL display.
5. Wait until "FINISH" is indicated on the FL display.
6. Remove the USB memory stick then set the function setting to anything other than USB.
7. Return the function setting to USB function and wait for about 5 seconds in order to obtain the version data of the USB firmware.
8. Turn the unit off (Standby mode).
9. Check the version ("U_xxxxxx" is suffixed to the version indication). If the version is not updated, the data for the new version may not have been obtained in Step 7. Repeat Step 7 and the subsequent steps.
Notes:
# Never reinsert the USB memory stick that contains the "player.rom" file.
# In a rare case, depending on the type of USB memory stick, the above-mentioned updating procedures are not possible. In such a case, try with other type of USB memory stick.
Importance:
# Never change the function setting or turn the power off during the process of Steps 3 through 5. If you do, loading of the firmware will fail, and updating procedures cannot be continued. In such a case, replacement of the flash memory is required.