Panasonic SV-3500 Quick start guide

Panasonic
e
K
Audio Division
Matsushita Electric Industrial Co. Ltd.
ORDER NO. AD8809230T
D 3
ffifcofl Guide
■
.
L

Contents
i
1. General
3
2. Major Blocks and Their Operation
5
3. RF Section
14
4. Signal Processing Circ it
51
5. A dio Section
66
6. Panel Control
77
System Control Circ it
7.
101
8.
Servo
131 Tape Loading
9.
Fewer S pply
136
10.
Mechanism
11.
141
Tro bleshooting Man al
12.
163
13. Adj stment Man al
176
14. Pin Description of Major IC's
187

1. General
2. Major Blocks and Operation
Function of the SV-3500
.
Major Blocks and Operation
2.
h

1. General
1-1. Function of the SV-3500
(1)
(2)
(3)
'J
1 — •
terminals
cables permit digital.
recorder
and
A 30 nW cylinder head is sed for signal recording and playback.
Use of a DC motor and a
loading and mode switching
stainless steel chassis, :
Post-recording f nction
The post-recording f nction for s bcode data permits program
n mbers to be rewritten and skip ID's to be written.
DD (direct drive) capstan motor for tape
f. and mo nting of the mechanism in a
res lt in stable
main feat res are listed below.
The SV-3500 is a f ll-fledged DAT (Digital. A dio Tape)
with coaxial and optical, digital I/O terminals, for inp t
o tp t in addition to the analog LINE IN/OUT terminals.
Use of level
F rthermore,
to
free level, displays.
SV-3500 is compatible with broadcast
and B (Japan only) permitting digital
digital m sic signals from a broadcast
26 digit display,
from digital signal,
display , ass res error
The digital signal inp t and o tp t terminals for fiber
optic cables and coaxial cables permit digital, copying of
tapes. (To another DAT recorder with digital inp t and o tp t
compatibility) .
F rthermore , the
satellite modes A
recording of the
satellite t ner.
meters with a large
the direct display system,
digital, data decoder to digital
tape transport. The

4) Basic Operation
5) Added F nction
(1)
(2)
(4)
(4)
2
Increased se IC's in the power s pply circ it of the SV-3500
has red ced the size of the PC board area.
position of a program and a tomatically
the old start ID.
the
is
Start ID:
Move
starting
Ren mber :
Ren mbers the programes.
Skip ID:
Recording
ndesired
skipped d ring playback,
fast forwarded,
A to (absol te time) :
Writes the absol te time onto a tape which has been
recorded on a recorder not capable of writing the absol te
time.
Also compatible with 32 KHz digital recording, the SV-3500 is
capable of digital, recording the broadcast satellite modes A
and B. (The SV-3500 is compatible only with mode B at 48 KHz).
the position of the start ID which is entered at the
erases
The post-recording f nction for s bcode data has been added to
permit the SV-3500 to change the following data.
The m sic scan (introd ction search) f nction plays only the
first 9 seconds of each program. The "cleaning" indicator
f nction has been added to inform the ser when the head
req ires cleaning. (Lights when the error rate exceeds 1000).
In this g ide, each block in fig re 2-1 is described.
a
skip ID at the beginning and end of an
part of a recorded tape enables that part to be
(When a skip ID is detected
tape is fast forwarded, and when the next start ID
detected the tape is played back).

2. Major Blocks and Their Operation
1) Cylinder (head)
2) RF Circ it (chapter 3)
I
3) Signal. Processing Circ it (chapter 4)
4) A dio Circ it (chapter 5)
5) Pane). Control Circ it (chapter 6)
I
6) System Control Circ it (chapter 7)
7) Servo Board (chapter 8)
the
3
A 30 mm^f cylinder head which helically scans the DAT tape is
sed. The tape has a wrap angle of 90 degree with respect to
the cylinder and the cylinder is fitted with two heads, A and
B.
The signal
distorted waveform
recording to the tape,
circ it which amplifies and waveshapes the signal so that
signal can be processed easily at the data slice circ it
the next stage.
This circ it, the heart of the mechanism operation control,
receives vario s types of data from the panel control circ it,
signal processing circ it and servo circ it, and controls the
overall operation of the system.
This circ it incl des the A/D and D/A converters and mainly
handles the m sic signal.
reprod ced by the cylinder has a considerably
(compared to the digital signal ) when
The RF circ it contains a waveshaping
the
in
This
circ it prod ces the format of the signal recorded on the
tape d ring recording and interleaves the data and adds error
correcting codes. D ring playback, reading of the m sic
signal, error correction, error interpolation, and reading of
the s bcode data are performed. This circ it also generates
the clocks sed in the SV-3500.
This circ it perform inp t processing of the control keys,
control the FL display and exchanges control data with the
system control circ it.
This circ it monitors and controls
mechanism.
the operation of

8) Loading Mechanism (chapter 9)
and
9)
Power s pply Circ it (chapter 10)
This
the
Mechanism Block (chapter 11) 10)
mechanism is same as SV-D1000 (Technics 1st generation
Cylinder
J37
PLL bloc
J37
H.P
J4
J 6
cn
JI 7
Figure 2-1 Organization of the SV-3500
4
DEW
o-
Mechanism
(chapter 11)
This
DAT) .
OPEN/CLOSE
RF board
( chapter 3 )
Panel control circ it
(chapter 6)
A dio circ it
(chapter 5)
() LINE IN/OUT
() DIGITAL IN/OUT
() OPTICAL IN/OUT
Servo board
(chapter 8)
System control
circuit
(chapter 7)
Power supply
board
(chapter 10)
J7
J6
J
JI 2
J 3
J 4
Loading
mechanism
(chapter 9)
circuit supplies the AC and DC power required by
various circuits in the SV-3500.
Signal processing
circuit
(chapter 4)
This mechanism is driven by a single DC motor and loads
unloads the tape.

3. RF Section
3- . Block Diagram Description
3-2. Playback Circuit Operation
3-3. Recording Circuit Operation
I
5

3-1. Block Diagra Description
4th AMP
EQ LPF —
---- RSRF (playback signal)
Head B
Playback Circ it Block
HSW (head switch)
REC AMP
Recording Circ it Block
SRRF (recording signal)
1) Playback Circ it
RF signals picked p by head A and head B
then
a
2) Recording Circuit
6
Integra
tion
I
_ 1
I
I
I
I
A/B
separat
ion
Wave
shaping
at
for
SRRP
■-•-(recording signal)
playback switching
low
A/B
Head A
A/B
mixing
JT
I
removed
to the
the eye
I to a
processing
lst-3rd AMP
ra!
fir'
• i >
w
W [_777_ ] _
(3) The
the
eq alization.
serial signal is amplified by approximately 20 dB
4th amplifier and sent to the eq alizer
I ___ Integra
* t ^ on I
S2 During playback' SI ON S2 OFF | •
During recording: S2 ON S OFF
|lst-3rd AMP
(2) The separated signals are amplified at their respective
amplifiers and sent to head A and head B. The recording
c rrent switching circ it is a gain switching circ it
which changes the level of the PCM and ATF components of
the RF signals for recording.
pattern of
rectang lar
circ it as
signal ).
filter, the signal is sent
At the waveshaping circ it,
’ is waveshaped
and then sent to the signal
RSRF signal (which is a digital data
Recording I --
c rrent
switching I
lg_r
rec amp Fig re 3-1-1 RF Block Diagram
(1) The RF signals picked p by head A and head B are sent
thro gh the rotary transformers to their respective three
amplifiers and amplified by approximately 70 dB and
each signals is sent to the integrators.
(1) The recording signal. (SRRF) sent from the signal,
processing circ it is separated at the A/B separator, by
HSW signal, control, into RF signals for head A and head B.
(2) At the integrators, each signal is s bjected to
freq ency compensation and the res lt is sent to the
mixer. Based on HSW signal control, the A/B mixer converts
the signals reprod ced at head A and head B to a serial,
signal. .
(4) After the nwanted 8 MHz and above components are
at the low-pass
waveshaping circ it.
the
eq alized signal
wave
the

3-2. Playback Circuit Operation
1) Fran the Heads to the 4th Amplifier
TP353
EQ (IC35 30)
VCC1
2
*5V
TP352
R362
OC
Q352
Fran the recording amplifier (pin 18 of IC-351)
Fran the recording amplifier (pin 19 of IC-351)
Figure 3-2-1 Playback Circuit Diagram
(1)
(2)
(3)
7
When
from
IC-351
(AN7030S)
command
goes
a
turn
this
the
R/P
S/W
driver
A/B
S/W
driver
ZJ
Next,
351,
(At
Thus,
are
and
are
the
R381
cd
co-L-
-(A
Head A
r=3ii^
Head B
Cylinder
GND
APB
AREC
BPB
BREC
J28
GND
APB
AR EC
BPB
BREC
2
T
5
"2.
3
5
A/B
mixer
— -42ndJ> —
A^ ip A
L
3W4
4 th
AMP
04
CO —
CO CO
XHx
— T ” T “ co-j-ci -r-M
<?| O O
O I I
0(4 ;
C354jt
Q357 J-
O0W39V38J
TP ^ 5 ' mw amp
Q (J3o3 | — — — «
Ml
_ 035 * ------
Q355/x>.
J27
• ] 3 | RPSV |
- |ll| SRRP|
- | 8 | HSW |
C355O*
4^)0358
TV
ffi) ----
Q351 and Q352, which are connected to pin 23 of ic 
on and this gro nds the REC side of the heads,
time, Q355 and Q356 on the PB side are off).
RF signals picked p at the heads are sent to
Q353 and Q354 (via the rotary transformers and pins 2 and
4 of connector J28). They are amplified and then sent to
pins 3 and 5 of IC-531. Q357 and Q358 are provided to
prevent C354 and C355 from discharging d ring recoeding.
pin 11 of connector J27 goes low d e to a
the signal, processing block, pin 26 of IC-351
low. Then, a high o tp t appears at pin 23 of IC-531 and
low o tp t appears at pin 22.
5 X 6
The RF signals inp t at pins 3 and 5 of IC-351
amplified at the 2nd and 3rd amplifiers within the IC
o tp t from pins 41 and 42. The o tp t RF signals
s bjected to low freq ency compensation at
integrators, consisting of C370 thro gh C373 and
thro gh R384, and inp t to pins 39 and 40 of the IC-351.