Sanyo DC-F320 - CD Player Tracking Balance and Eye Pattern Adjustments

CD PLAYER ADJUSTMENTS
4. ADJUSTMENTS
Adjustment
Item
(a) Tracking
balance
(b) Checking
the “eye”
pattern
Measuring
instrument
Oscilloscope
Oscilloscope
Service
mode
output
connection
TP3 : TE
TR4 : VC
TPI : RF
TP4 : VC
Adjustment
location
VR101
(1)Tracking balance adjustment
1. Connect an Oscilloscope to TP3 (TE) and TP4(VC).
2. Turn “POWER” switch on.
3. Set the test disc.(DISC 1)
4. Press “SOUND PRESET” key and “TUNING MODE” key
simultaneously .Within 1 second after pressing the
“MEMORY” switch.
(SERVICE MODE : Tracking balance adjustment mode)
5. Confirm that the oscilloscope waveform is symmetrical on
the top and bottom in relation to OV(VC).
6. If it cannot be adjusted by fully rotating VRlOl, cut the
resistor R1108 (1 Ok R ) with a pair of pliers,and adjust
again.
7. To cancel service mode, disconnect the power cord’s plug
from the electrical outlet.
(2)Checking the “eye” pattern
1. Switch “ON” the POWER.
2. Connect an oscilloscope to TPl (RF) and TP4(VC).
3. Load the test disc.
4. “PLAY/PAUSE” switch push ON.
5. Check to be sure that the “eye” pattern is at the center
ofwaveform and that the diamond shape is clearly defined.
6. Press the “STOP” button.
7. Switch “OFF” the POWER.
Adjustment value
Waveform symmetry
A=B
Check be sure that the “eye”
pattern is at the center of the
waveform and that the diamond
shape is clearly defined
TE
200mVIdiv.
5ms/div.
ENING EXPANDED
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