Yamaha ACD1 Service Manual page 39

3-4. GPI test (NO. 04)
Contents: Check the output from the GPI terminal using the dedicated test jig (refer to 1-3.).
* Test can be conducted only when D-SUB (39) is connected.
Example of executing screen
*** 04. GPI
IN(OUT) Lo[V]
CH1(1) 0.019
CH2(2) 0.016
CH3(3) 0.016
CH4(4) 0.019
GPI OK!
[GPI test screen]
Check items
・ DS2 circuit board : Check if the IC602, TA601, CN603 and peripheral devices are installed properly.
・ BRG circuit board : Check if the IC203, IC204, IC206 and peripheral devices are installed properly.
・ Check the signals from the CPU circuit board and connection.
3-5. FAULT test (NO. 05)
Contents: Check the output from the FAULT terminal using the dedicated test jig (refer to 1-3.).
Example of executing screen
*** 05. FAULT
FAULT Loopback Testing...
FAULT OK!
[FAULT test screen]
Check items
・ DS2 circuit board : Check the TR601, RY601 and peripheral devices.
・ BRG circuit board : Check the IC107, IC113 and peripheral devices.
・ Check the signals from the CPU circuit board and connection.
***
Hi[V]
2.771
2.775
2.778
2.778
EXIT:[ENTER]
***
EXIT:[ENTER]
ACD1
39