Yamaha ACD1, Service Manual

Page: 43 / 125

ACD1
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: 3 pin or 4 pin or 5 pin
PROTECTION [32]: 11 pin or 5 pin or 4 pin
PROTECTION [33]: 10 pin or 5 pin or 4 pin
PROTECTION [34]: 9 pin or 5 pin or 4 pin
PROTECTION [35]: 8 pin or 5 pin or 4 pin
STANDBY: 2 pin or 3 pin
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])