9
CX-3311
5
6
7
8
5
6
7
8
A
B
C
D
E
F
1.4 CIRC BLOCK (MN2DS0018MA : IC1501)
1.5 DRC BLOCK (MN2DS0018MA : IC1501)
1.3.7 Tracking Balance (TBAL) Adjustment
The function is to vibrate the lens in the direction of track, and using the Newton-Raphson method,
search for the balancing point where DC offset will be zero and adjust it during Focus Close and Tracking Open.
1.3.5 DPD Amplitude Adjustment
The function is to adjust the gain at the analog stage so that the input signal of the DPD comparator of the TE generating
circuit of DVD will be constant.
1.3.6 Tracking Error Amplitude Learning
The function is to vibrate the lens in the direction of track and adjust the TE amplitude level so that it will be
190LSB at the digital equalizer input stage during Focus Close and Tracking Open.
1.3.8 OFTR Adjustment
The function is to adjust the binarization threshold level to binarize an OFTR signal.
1.3.4 Focus Balance (FBAL) Adjustment
The function is to adjust a focus position so that RFENV will be maximized during Focus Close, Tracking Open
and Tracking Close.
1.3.10 Focus Gain Adjustment / Tracking Gain Adjustment
The function is to adjust to the target gain intersection point by injecting disturbance into a Servo Loop during Tracking Close.
1.3.9 AS Normalization Adjustment
The function is to fine-tune the AS signal level so that it will be 64 LSB at the digital equalizer input stage after measuring
the AS signal level by the specified number of sampling and A/D converting it at ADSC during Tracking Close.
All the automatic adjustment results can be checked on the display in a test mode.
List of Automatic Adjustment Coefficients
Caution:
All coefficients are expressed in hexadecimal. The specification values for all production lines (during TP production) are used.
As for a disc used, it is TDV-582 for DVD and TCD-792 for CD.
VIN9 Offset
State
06B1
_
08D3
VIN10 Offset
Focus close
FEPP(FEMAX-FEMIN)
1D84
_
6C08
AS MAX
FE
Normalization Adjustment
Focus close
(after TBAL)
TEPP(TEMAX-TEMIN)
36B0
_
80E8
Not specified
TE
Normalization Adjustment
Tracking close
Focus Gain
Tracking Gain
AS
Normalization Adjustment
Power On
VIN8 Offset
VIN7 Offset
-
DVD
CD
Coefficient
05FB
_
0A17
05FB
_
0A17
-
06B1
_
08D3
2E18
_
A8CF
Not specified
Not specified
1235
_
5B07
0100
_
0400
0100
_
0400
Not specified
The CIRC block incorporates the digital signal processing function for CD-DA and CD-ROM
(EFM demodulation and error correction) and the digital servo processing function for a Spindle Motor.
The Digital Read Channel (DRC) is equipped with A/D converter, Digital Equalizer (DEQ), Adaptive
equalizer, Viterbi detector, Digital PLL circuit, RISC interface, and peripheral circuits to read signals of an optical disc.