Confirming The Servo - Denon DN-C680 Service Manual

CONFIRMING THE SERVO

CAUTION:
The Optical Pick-up used for CD player may invite defection by an external noise, such as electrostatic, etc.,
please pay the following attention.
1. Use a conductive mat on a working table to avoid electrostatic damage.
2. A working personnel should use a wrist strap to ground human body.
3. Tools, etc., specially for a soldering iron must use with its tip grounded and without leakage of electricity.
Utmost care must be taken to your clothes for electrostatic damaging in a low humidity environment.
Required Measuring Implement
1. Dual trace oscilloscope
2. Reference disc (TCD784 or CO-74176)
1. Actuating the Service Program and Servo Confirming Method
1. Turn the power switch off.
2. While simultaneously pushing the STANDBY/CUE button and PLAY/PAUSE button, turn the power on.
3. Turn SELECT knob. Display shows "
3. Displayed indication is version number of microcomputer program.
4. As the tray opens, set the adjustment disc (TCD784 or CO-74176) 4 figures on the left are program version of remote control, and 4 figures on the right are program version of main body
mechanism.
5. Turn SELECT knob ("
4. Turn SELECT knob. Display shows "
Tracking error signal can be observed with the connection below. (Fig1)
5. As the tray opens, set the adjustment disc (TCD784 or CO-74176)
6. Turn SELECT knob ("
6. Turn SELECT knob ("
HF signal can be observed with the connection below. (Fig2)
Tracking error signal can be observed with the connection below. (Fig1)
7. Turn SELECT knob ("
7. Turn SELECT knob ("
By pressing button servo automatic adjustment value can be called. (Ref. Table below)
HF signal can be observed with the connection below. (Fig2)
8. Turn SELECT knob ("
By pressing button servo automatic adjustment value can be called. (Ref. Table below)
TP101
1
NC
2
VREF
TP101 3
HF
1
4
NC
TE
2
5
VREF
NC
3
6
HF
FE
4
TE
5
NC
6
FE
TRACK Portion
Indication
TRACK Portion
Indication
04
04
" and each pressing of PLAY button opens or closes the tray.
" is displayed), also, press PLAY/PAUSE button.
" and each pressing of PLAY button opens or closes the tray.
" is displayed), also, press PLAY/PAUSE button.
" is displayed), also, press PLAY/PAUSE button.
" is displayed), also, press PLAY/PAUSE button.
" is displayed), also, press PLAY/PAUSE button.
" is displayed), also, press PLAY/PAUSE button.
Oscilloscope
Oscilloscope
Fig1
Fig1
Adjustment
Item
Error Code
Adjustment
Focus Gain (FG)
Item
Focus Balance (FBAL)
Error Code
Focus Offset (FOFS)
Focus Gain (FG)
Tracking Gain (TG)
Focus Balance (FBAL)
Tracking Balance (TBAL)
Focus Offset (FOFS)
Tracking Offset (TOFS)
Tracking Gain (TG)
* When adjustment range exceeds, replace pick-up.
Tracking Balance (TBAL)
Tracking Offset (TOFS)
* When adjustment range exceeds, replace pick-up.
TP101
1
NC
2
VREF
TP101
3
HF
1
4
NC
TE
2
5
VREF
NC
3
6
HF
FE
4
TE
5
NC
6
FE
Adjustment Value
indication
at S and F portions.
Adjustment Value
indication
125 ~ 728
at S and F portions.
120 ~ 120
57 ~ 57
125 ~ 728
101 ~ 808
120 ~ 120
105 ~ 105
57 ~ 57
31 ~ 31
101 ~ 808
105 ~ 105
31 ~ 31
4
DN-C680
Oscilloscope
Oscilloscope
Fig2
Fig2
Adjustment Item
No. indication
at M portion.
00
Adjustment Item
No. indication
01
at M portion.
02
00
03
01
04
02
05
03
06
04
05
06
4