Yamaha DME4io-ES Service Manual page 62

DME4io-ES/DME8i-ES/DME8o-ES
3-8. GPI Test (NO. 08)
Contents: The GPI output and the GPI input are loop back connected via a GPI loop back test jig refer to the page
50, and the GPI input voltage is measured to automatically check for normality. The GPI output has
two voltages, namely L/H. The test result shows the L/H voltages for all channels. Automatically checks
if Lo side is between 0.0 V – 0.5 V and Hi side is between 3.0 V – 3.3 V and if every GPI input meets
requirement.
Example of Executing Screen
*** 08. GPI
GPI Loopback Testing...
Result Display Screen (In case of OK)
*** 08. GPI
IN (OUT) Lo[V]
--------------------------------------------
CH1 (1) 0.010
CH2 (2) 0.010
CH3 (3) 0.010
CH4 (4) 0.010
CH5 (2) 0.016
CH6 (3) 0.019
CH7 (4) 0.019
CH8 (1) 0.019
GPI OK!
Result Display Screen (In case of NG)
*** 08. GPI
IN (OUT) Lo[V]
--------------------------------------------
CH1 (1) 1.200
CH2 (2) 0.000
CH3 (3) 1.201
CH4 (4) 1.205
CH5 (4) 1.203
CH6 (3) 1.203
CH7 (2) 1.203
CH8 (1) 1.203
NG: GPI CH ERROR!
Troubleshooting
Check the signals connected to the following terminals in case of NG.
AN[2] (233Pin), AN[3] (234Pin), PTC[4] (208Pin), PTC[3] (212Pin) of CPU (CPU circuit board: IC002)
SUB circuit board: Each signal connected to the IC503
62
***
***
Hi[V]
3.300
3.300
3.300
3.300
3.300
3.300
3.300
3.300
EXIT:[ENTER]
***
Hi[V]
3.140
0.000
3.139
3.141
3.140
3.140
3.140
3.140
EXIT:[ENTER]