Codec Power Down (Mute); Level - Korg AX3000G Service Manual

6. TUNER
After NG occurred on INTERNAL CHECK, you can resume by pressing AMP/LINE switch and
the following switch for each case;
Switch
CUR_LEFT
CUR_RIGHT
CUR_DOWN
CUR_UP
When all INTERNAL CHECK has finished, it automatically moves to operation check.
INTERNAL CHECK - 4. CODEC POWER DOWN (MUTE)
This is to check the connection between CODEC's PD (pin14) and DSP (Pin52-CPU contolled).
Check Input level with the same setting as Step 1 of LEVEL check and confirm if it is 0 data
output (in "mute"state).
INTERNAL CHECK – 5. LEVEL
Output 1kHz sine wave from DSP to examine the a level returning to Input.
"PHONE-> INPUT" and "SEND -> RETURN" are supposed to be connected by testing cables.
The following is Routing, output level and input level
1. L->R , RETURN SW Off
DSP So1L (0.500(=1/2)) ---> DSP Si1R (0.338713 +-30%)
IN ------------------->¦ Ain R ¦ AoutR ¦------+-----> OUT-R
1. 2217.461047Hz (C#7)
2. 25.9565436Hz (G#0)
How to resume INTERNAL CHECK
Reexamine the NG step
Skip the NG step and proceeds to next step.
Reexamine the NG item.
Skip the NG item and proceeds to next item.
CODEC (AK4522)
+-------+-------+
¦ Ain L ¦ AoutL ¦----+-¦-----> OUT-L
¦
+--¦ DoutL ¦ Din L ¦<---+
+-¦--¦ DoutR ¦ Din R ¦<-+ ¦
¦ ¦ +-------+-------+ ¦ ¦
¦ ¦
¦ ¦ DSP(FXD03)
¦ ¦ +-----------+
¦ +-->¦ Si1L So1L ¦-----¦-+
+---->¦ Si1R So1R ¦-----+
+-----------+
(within an
+-----> PHONE L
¦ +---> PHONE R
¦ ¦
¦ ¦
¦ ¦
¦ ¦
¦ ¦
TUNER HI
TUNER LO
allowance) of each step.