Yamaha ACD1 Service Manual page 43

Check items
[In case OUTPUT LEVEL MONITOR is NG]
・ DS1 circuit board : Check if the IC508 to IC526 and peripheral devices are installed properly.
・ DS2 circuit board : Check if the IC612 to IC614, IC616 to IC631 and peripheral devices are installed properly.
・ Check the signals from the CPU circuit board and connection.
[In case PROTECT STATUS MONITOR is NG]
・ DS1 circuit board : Check if the IC505, IC506, IC501 and peripheral devices are installed properly.
・ DS2 circuit board : Check if the IC609, IC610, IC601 and peripheral devices are installed properly.
・ BRG circuit board : Check if the IC205 and peripheral devices are installed properly.
・ Check the signals from the CPU circuit board and connection.
[In case MODEL ID is NG]
・ DS1 circuit board : Check if the IC507 and peripheral devices are installed properly.
・ DS2 circuit board : Check if the IC611 and peripheral devices are installed properly.
・ BRG circuit board : Check if the IC203, IC206 and peripheral devices are installed properly.
・ Check the signals from the CPU circuit board and connection.
[In case STANDBY is NG]
・ DS1 circuit board : Check if the IC504, TR501 to 504 and peripheral devices are installed properly.
・ DS2 circuit board : Check if the IC608, TR602 to 605 and peripheral devices are installed properly.
・ BRG circuit board : Check if the IC204 and peripheral devices are installed properly.
・ Check the signals from the CPU circuit board and connection.
[Others]
Apart from above cases, the following parts can also cause NG of D-SUB test.
・ DS1 circuit board : IC502, IC503, TR505 to TR520 and peripheral devices.
・ DS2 circuit board : IC606, IC607, TR606 to TR621 and peripheral devices.
・ BRG circuit board : Check if the IC204 and peripheral devices are installed properly.
・ MONITOR/REMOTE terminal: Check each pin of D-SUB.
OUTPUT LEVEL [32]: 15 pin or 7 pin or 6 pin
OUTPUT LEVEL [33]: 14 pin or 7 pin or 6 pin
OUTPUT LEVEL [34]: 13 pin or 7 pin or 6 pin
OUTPUT LEVEL [35]: 12 pin or 7 pin or 6 pin
MODEL ID:
PROTECTION [32]:
PROTECTION [33]:
PROTECTION [34]:
PROTECTION [35]:
STANDBY:
In case of "OUTPUT LEVEL [32]: NG", the followings are also possible causes.
・ OUTPUT LEVEL itself is defective. (15 pin)
・ The Mute circuit is defective and OUTPUT LEVEL signal is not switched. (7 pin or 6 pin [Mute signal])
3 pin or 4 pin or 5 pin
11 pin or 5 pin or 4 pin
10 pin or 5 pin or 4 pin
9 pin or 5 pin or 4 pin
8 pin or 5 pin or 4 pin
2 pin or 3 pin
ACD1
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