Yamaha DME4io-ES Service Manual page 58

DME4io-ES/DME8i-ES/DME8o-ES
3-2. BATTERY Test (NO. 02)
Contents: Checks the voltage of the backup battery automatically by measuring it in A/D.
The measured battery voltage is displayed.
Example of Executing Screen
*** 02. BATTERY
VOLTAGE: 3.05[V]
OK.
VOLTAGE: 2.50[V]
NG: BATTERY LOWER ERROR!
EXIT:[ENTER]
Messages
• At battery overvoltage:
• At shortage of battery voltage:
• At lower battery voltage:
Troubleshooting
Check backup battery (CPU circuit board: BT001) and the path from the backup battery to the PTK [1] (114Pin) and
AN [6] (238Pin) of the CPU (CPU circuit board: IC002).
Applicable Range of Measured Voltage
• Acceptable voltage range
• Overvoltage
• Low voltage
• Voltage shortage
3-3. PLLP2 Test (NO. 03)
Contents: Checks register (00h,0Fh,10h,16h) of PLLP2 by writing/reading and comparing them.
Example of Executing Screen
*** 03. PLLP2
0x00 W/R OK!
0x0F W/R OK!
0x10 W/R OK!
0x16 W/R 0x16 W:0x0F R:0x00
EXIT:[ENTER]
Troubleshooting
Check the followings in case of NG.
Check malfunction of PLLP2 (DSP circuit board: IC052) and signal path (address bus, data bus, control signal, etc.)
connected between the PLLP2 and CPU (CPU circuit board: IC002).
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***
NG: BATTERY OVER ERROR!
NG: BATTERY EMPTY ERROR!
NG: BATTERY LOWER ERROR!
2.80 [V] – 3.50 [V]
3.51 [V] or over
2.79 [V] – 0.51 [V]
0.5 [V] or under
***
Indicated in case of OK
Indicated in case of NG
Indicated in case of OK
Indicated in case of NG