Yamaha R-N500, Service Manual

Page: 29 / 100

P 1 - 1
D C : 1 1 2
P1. AD DATA CHECK
This menu is used to display the A/D conversion value of the microprocessor which detects panel keys and protection
functions by using the sub-menu.
When “P1-7. KEY” sub-menu is selected, keys become inoperable due to detection of the values of all keys. However,
it is possible to advance to the next menu by turning the VOLUME knob.
*
Numeric values in the figure are given as reference only.
P1-1. DC
Power amplifier DC (DC voltage) output is detected.
The voltage at 120 pin (DC_PRT) of IC21 is displayed.
Normal value: 38 to 156
(Reference voltage: 3.3 V=255)
*
If DC becomes out of the normal value range, the protection function works to turn off the power.
P1-2. PS
Power supply voltage (PS) protection detection.
The voltage at 126 pin (PS1_PRT)/107 pin (PS2_PRT)/106 pin (PS3_PRT) of IC21 are displayed.
Voltage detects
PS1: BL2, AC_12, ±7A, +3.3S
PS2: ±12A, +5A, -VP
PS3: +5.5V
Normal value
PS1: 26 to 150
PS2: 63 to 197
PS3: 132 to 168
(Reference voltage: 3.3 V=255)
*
If PS1, PS2 or PS3 becomes out of the normal value range, the protection function works to turn off the
power.
P 1 - 2
P S : 0 8 8 / 1 2 1 / 1 5 2
PS3
PS2
PS1
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R-N500
R-N50
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