Kenwood DP-M993 Service Manual

D
18
P-M993/M5550/M6650 -
CIRCUIT DESCRIPTION
4. Digital Signal Processor : MC159236AFU (ІС2)
Outline
MC159236AFU is a 1-chip processor for step-out
protection and interpolation, EFM, error correction,
microcomputer interface, CLV servo and focus track-
ing servo of the CD player.
Features
* CMOS silicone structure for high-speed and low
power consumption.
* Flat package with 80 pins. Stable synchronous pat-
tern sensing function, synchronous signal protection
and interpolation function.
е Built-in EF demodulation and sub code demodulation
circuits.
• CIRC correction theoretical formula is used for single
correction by C1 correction part and double correc-
tion by C2 correction part.
4-1.Block diagram
Data slicer
|| sensing circuit
CLV servo circuit
PLL circuit
Synchronous sepa-
ration circuit / EFM
demodulation cir-
Error pointer
Correction output
circuit (Audio output)
=i
W
Address circuit
Correction ALU
IDEE
wa
mum
| Error location
ROM
EE
Sub
ems
ry»
de-
Q
data
stor-
EE
modula
tion
age
RAM
HE
Ө О
MODO
SBOK
XI
xo (=)
Уррр (Ег?
CD bus interface
anno (5)
• Jitter absorbing capacity of +5 frames.
• Smooth muting by zero cross sensing is possible.
* Attenuation of 12dB is possible.
* Built-in 16k S-RAM.
* Built-in digital out circuit.
* Built-in data slicer and analog PLL (with adjustment-
free VCO) circuits.
e Automatic adjustment function of focus and track-
ing loop again.
* Built-in AFC and APC circuits for disc motor CLV
servo.
Built-in focus and tracking servo control circuit.
Tracking search control applicable in any mode.
Built-in microcomputer interface circuit.
Read timing-free sub code О data.
* Applicable to double-speed operation.
16k SRAM
Focus / Tracking servo
Tracking search control circuit
Servo status signal
generation circuit
Correction system
timing generator
unu «а lli ТАП,
m
o uo
o m
OO OCIO
BUS1 BUS2
BUS3
BUCK
4NCK
CCNT
SUBD
CLCK

Kenwood DP-M993 Specifications

General

Brand	Kenwood
Model	DP-M993
Category	CD Player
Language	English