Kenwood DP-3010 Service Manual page 39

DP-3010
72
CIRCUIT DESCRIPTION
{4) Tracking Search System
TA8101N
TA9201 BF
Disc Motor Drive
Feed Motor Drive
Tracking Coil Orive
Diagram 7-28 System Construction Diagram
Correlation Pins: TESH, TEOF, TGUL, TGUH. TKIC, FMGU,
FMON, FMFB, SEL
Commands: SETR2(9FR5Rs) Write Command
(CM-C)
PAUSE (ARS N,)
FEED (BRs N,)
NKIC (CRSN,)
NKICE (ORS N,) il al
CKIC (ERS To No)
CKICF (FRS Ty Ng)
STRD (1)
Command Reception Conditions: DMSV (86xx) Command
Set
(FOK is to = H — Focus
ON)
Note: Each Command Bit Information
Data R5 R6 Rs
D3. ~<GUPI =LDCP BR — |
D2 HYSI | RFRG1: FGC : — |
DI GUP2 RFRG2. TGC T
DO. HYS2.. FMSS__B/F T
Number 9f Kick Track 8 bits N, Track Kick
Amount '0 ~ 255)
Number of Kick Track 8 bits 64 XN2 Track
Kick Amcunt (0 ~ 16320)
Number 3f Kick Track 4 bits N1 Track Kick
Amount 0 ~ 15)
Kick Interval 2 bits during CKIC and CKICF
{62 ms ~ 495 ms)
DP-3010
CIRCUIT DESCRIPTION
The basic operation of Tracking Search (after Search) are
two types, Lense Kick Search (PAUSE, NKIC, NKICF) of the
Pick-up and Pick-up Feed Motor Search (FEED). Beside
this there is the Continuous Kick Search (CKIC, CKICF) of
the Lease Kick that is done periodically.
The six types of search just mention are explained in the
following.
1 PAUSE....With the Feed Motor Send OFF, 0 ~ 255
Track Lense Kick
After the Lense Kick operation is complete,
the Feed Motor goes from STOP — PAUSE
operation
2 FEED .Turn ON Feed Motor Send and Search.
Send 64 x (0 ~ 255) Tracks
3 NKIC ..With the Feed Motor Send OFF, 0 ~ 255
Track Lense Kick
4 NKICF.....Turn ON Feed Motor Send and NKIC
Search.
Be -CKIG esses O ~ 15 Track Lense Kick for fixed intervals.
— Fast Forward, Fast Reverse operations
6 CKICF.....Turn ON Feed Motor Send and CKIC
Search
The Search System uses the count method of the
number of tracks. Search commands such as, whether
to apply the brake on the Track Lense Kick operation or
not. whether the Search Direction should be Forward
(FWD) or Backward (BWD), are selected in the 4 bit C3
~ CO of CM-D. For details, refer to Control Command (3)
Write Command CM-D.
The basic Tracking Search Operations are shown in the
Tracking Search Timing Chart, Examples 1 ~ 8, but for
the Correlated Pin Operation, see the following.
@ SEL Pin: As soons as search is complete.
changes to "L" level, and switched to
the TE and RFRP Signals input from
TA8101N. As soon as this search is com-
plete, returns level to HiZ. Only in the
case that the bit data from HYS2 (see
CM-C STR2 for details) in hysterisis oper-
ation, the "L" level is held for 2 ~ 3 ms
after search completion.
During Forward Directiona
Search, the TE Signai becomes
positive (+) polarity thus | Be
changing the Error Signal. careful
During Backward Directional | with
Search, the TE Signal becomes
negative (—) polarity thus
changing the Error Signal.
e@ TSO Pin
polarity.
@ ZCLI Pin:
® Z2CL2 Pin:
© TKIC Pin:
@ TESH Pin:
@ TEOF Pin:
During search this has a fixed output of
Vrer/2 (Digital Data = 10000).
While= ""L" level, the RFRP Signal is
output.
During PAUSE, NKIC, NKICF commands
input:
{a) When in FWD Search, V002 output
is fixed
(b) When in BWD Search, VSS output is
fixed
(c) When BR bit data = 0 in (a) and (b),
and when half the designated
number of tracks, N,/2 (When N, is
an odd number, the Track OFF
Point) is traversed, the TKIC pin be-
comes HiZ.
(d) When BR bit data = 1 in (a) and (b),
and when half the designated
number of tracks, N,/2 (When N, is
an odd number, the Track OFF
Point) is traversed, the TKIC pin will
output the opposite electrical value
(Brake Pulse) and then change to
HiZ after search is complete.
During FEED command input:
The TKIC pin is HiZ.
During Normal Play
\s shorted with the TEOF pin and the
Tracking Servo Signal is received
from TA8101N.
During Search
The TESH pin is Hiz.
During Special Play (2 ~ 3 ms period
after completion of search)
When the RFRP signa! is smaller
than the Slice Level, then HiZ. This
means that this pin will have hys-
teresis characteristics.
During Normal Play
Is shorted with the TESH pin.
During Search
VREF fixed output.
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