Yamaha ACD1 Service Manual page 38

ACD1
3. Test items
3-1. SRAM test (NO. 01)
Contents: Checks Address Bus and Data Bus of SRAM.
Example of executing screen
*** 01. SRAM
SRAM AddressBus
SRAM DataBus
EXIT:[ENTER]
Check items
・ Check if the SRAM （ CPU circuit board: IC009) is installed properly.
・ Check the connection between the SRAM and CPU (CPU circuit board: IC002).
3-2. BATTERY test (NO. 02)
Contents: Check the remaining level of the backup battery.
Example of executing screen
*** 02. BATTERY
VOLTAGE: 3.18[V]
OK.
EXIT:[ENTER]
Check items
・Check the battery (CPU circuit board: installed to the battery holder [BT001]).
・ Check the connection between the battery and PTK [1] (114Pin) of the CPU (CPU circuit board: IC002) and
between the battery and AN [6] (238Pin).
3-3. MAC ADDRESS test (NO. 03)
Contents: Automatically checks if the fi rst three digits of the MAC ADDRESS are "00.A0.DE".
Example of executing screen
*** 03. MAC ADDRESS ***
Ethernet Mac Address
Mac Address
[MAC ADDRESS test screen]
Check items
・ Recheck with the testing item selection list screen if the MAC ADDRESS is written.
38
***
OK!
OK!
[SRAM test screen]
***
[BATTERY test screen]
00.A0.DE.25.BA.5E
OK.
EXIT:[ENTER]