Power Supply System; System Monitor - Yamaha RX-V3900 Service Manual

RX-V3900/DSP-AX3900
– P: Power Supply (Power supply system) –
P1. SYSTEM MONITOR
This menu is used to display the A/D conversion value
of the main microprocessor which detects panel keys of
this unit and protection functions in using the sub-menu.
Signal processing is maintained in the status before ex-
ecution.
When K0/K1 menu is selected, keys become non-oper-
able due to detection of the values of all keys. However,
it is possible to advance to the next main menu by turn-
ing the PROGRAM knob of this unit.
* The figures in the diagram are given as reference
only.
DC (Protection detection)
DC: DC detect protection value (Normal value: 5 to 34)
* If DC is out of the normal value range, the protection
function works to turn off the power.
(Reference voltage: 5V=255)
PS1/PS2/PS3 (Protection detection)
Power supply voltage protection value
(Normal value: PS1: 43 to 66, PS2: 107 to 133, PS3: 140 to 179)
PS1: Detects ±B1, B2, ±12, ±RY, +5D2, +5I, +3.3HD.
PS2: Detects +2DSW, +3DSW, +4DSW, +6DSW, -VP.
PS3: Detects +5VA, -5VA, +9VA.
* If PS is out of the normal value range, the protection
function works to turn off the power.
(Reference voltage: 5V=255)
74
PS3
PS2
PS1