Yamaha RX-V3900 Service Manual page 29

Note: With this unit, it is possible to check the firmware
version and checksum by using the ADVANCED
SETUP menu.
1. Press the "MASTER ON/OFF" switch inward to the
ON position while pressing the "STRAIGHT" key
of this unit. Then the ADVANCED SETUP mode is
activated. (Fig. 3)
2. Keep pressing the "INFO" key of this unit for
about 3 seconds. (Fig. 3)
"Version/Sum" is displayed.
Press the "STRAIGHT" key to change display.
"MASTER ON / OFF" switch
3. Press the "MASTER ON/OFF" switch of this unit to
release it outward to the OFF position.
"INFO" key
"STRAIGHT" key
DSP1 checksum. /
Main Microprocessor checksum. /
Main Microprocessor version. /
VNP2 (Video Microprocessor) checksum. /
VNP2 (Video Microprocessor) version. /
Fig. 3
RX-V3900/DSP-AX3900
29