7
7DN-C680
CONFIRMING THE AUDIO
1. Necessary Equipment for Adjustment
Distortion--Factor Meter
VTVM
Low-Pass Filter (20kHz)
Reference Disc; DENON Audio Technical CD (38C39-7174)
2. Prior to Starting the Adjustment
1) Audio circuit shall be adjusted after adjustment of servo circuit.
3. Output Level Adjustment
1) Connect VTVM to the output connector of DN-C680.
Use 1:1 600 ohm Audio Transformer between the unit and VTVMs in order for matching the unbalanced input of VTVM
and the active bakanced output of DN-C680 as shown in figure.
LPF
(20kHz)
Audio Transformer
1:1
600ohm
Distortion Mete
Line Out
DN-C680
Connection for Output Level Adjustment
2) Play track number "49".
3) While reading VTVM indication, adjust VR407 (L-ch) and VR408 (R-ch) so that the output level attains +18dBm
(or desired level).
RL
VR408
VR407
Location of Level Adjustment VRs
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