Daewoo DUB-2850, Service Manual

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CP-780 Service Manual
* M/BTSC and N standards supported
* M/Japan (EIAJ) supported
* FM Radio stereo decoding
* Alignment-free, fully digital system
* For BTSC full dbx(r) performance
* SAP demodulation (without dbx(r)) simultaneously with stereo decoding, or mono plus SAP
with dbx(r)
* Line/pilot frequency selectable from 15.734 kHz and 15.625 kHz (or automatic detection / auto
search)
* High selectivity for pilot detection, high robustness against high-frequent audio components
* Pilot lock indicator
* SAP detector
* Separate noise detectors for stereo and SAP with adjustable threshold levels, hysteresis, and
automute function
An overview of the supported standards and sound systems and their key parameters is given
in the following tables.
The analogue multi-channel sound systems (A2, A2+ and A2*) are sometimes also named 2CS
(2 carrier systems).
ANALOG 2-CARRIER SYSTEMS
[Table] Frequency modulation
STANDARD SOUND CARRIER FM DEVIATION(kHz) MODULATION BANDWIDTH/
SYSTEM FREQUENCY NOM./MAX./OVER DE-EMPHASIS
(MHz) SC1 SC2 (kHz/us)
M Mono 4.5 15/25/50 Mono - 15/75
M A2+ 4.5/4.724 15/25/50 1/2(L+R) 1/2(L+R) 15/75(Korea)
B/G A2 5.5/5.742 27/50/80 1/2(L+R) R 15/50
I Mono 6.0 27/50/80 mono - 15/50
D/K(1) A2* 6.5/6.258 27/50/80 1/2(L+R) R 15/50
D/K(2) A2* 6.5/6.742 27/50/80 1/2(L+R) R 15/50
D/K(3) A2* 6.5/5.742 27/50/80 1/2(L+R) R 15/50
[Table] Identification for A2 systems
PARAMETER A2/A2* A2+ (KOREA)
Pilot frequency 54.6875kHz = 3.5 x line freq. 55.0699 kHz = 3.5 x line freq.
Stereo identification frequency 117.5 Hz = line freq / 133 149.9 Hz = line freq / 105
Dual identification frequency 274.1 Hz = line freq / 57 276.0 Hz = line freq / 57
AM modulation depth 50% 50%