Yamaha R-N402 Service Manual page 33

C2-8. NET EEPROM
Communication between NET CPU and EEPROM is checked.
R1 DAB
Not for service.
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 "P1-6. 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 IC302 is displayed.
Normal value: 27 to 136
(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 IC302 are displayed.
Voltage detects
PS1: FLDC, VP, AC, +5T, 8.44V
PS2: +3.3N
PS3: +5.5V
Normal value
PS1: 153 to 194
PS2: 103 to 129
PS3: 139 to 165
(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.
C2-8
NET EEPROM:NG
R1-1
N/A
P1-1
DC: 088
P1-2
PS:184/117/156
R1-2
DAB:N/A
PS3
PS2
PS1
R-N402/R-N402D
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