Advertisement
Ic,
HD49212
Pia
po
ms
No,
Pin
CCK
CTRL
Name
ur
CFGOUT
TACH
DFGOUT
170
Description
Microprocessor transfer data sync clock input.
Microprocessor data transfer mode input control
signal.
Capstan FG output. Monitors the C FG signal input via pin 13.
TACH
output.
The
trailing
edge
of
this
signal
is
used
as
a
reference
-
Position during recording.
Drum FG output.
Yonitors
the D FG signal input via pin 8.
t
HH
DGND
ENVIN
DFGIN
PHASE
TEST
DTPFB
DTPIN
oe
eed
Rad
od
Wi
N|RK|oO
15
we cad
an
>
CFGIN
SYNCI
TEST
CSYNC
PLTIN
e a
23
wefr}p
w]e]
rppRele
@]
a}
om R]elolola
AGAIN
BGAIN
PLT1L
PLT2
AGND
PLTVTH
VREF
CPLT
ENV
CSH1
CSH3
|
30
VOFT
31
CSH2A
32
CSH2B
33
ATFEL
34
ATFE2
335
cosil
[36
_cosz__
37
38
COOUT
39
RROUT
40
CIOUT
41
RPOUT
42
43
CIIN
44
CIPWM
43
AVDD
46
CPIN
47
CPPWM
DIOUT
>
a
Ground of digital circuit.
RF signal envelope input.
Drua FG input.
Connected to the resistors and capacitors of a monostable aultivibrator which
generates TACH pulses.
cl
Test input pin. (unused)
TACH amp output.
Drum TACH amp inverted
input.
=
o 5 ¢ s
pstan FG amp input.
Sync input during playback.
ATF sync signal derived from the RF signal through a
Test input pin. (unused)
Connected a capacitor which holds the threshold voltage of the sync comparator.
Pilot amp 1 positive-phase input.
Inverted input to adjust the gain of A-head pilot amp 1.
Inverted input to adjust the gain of B-head pilot amp 1.
Pilot amp 1 output.
Pilot amp 2 output.
ound of analog circuit,
ilot comparator threshold voltage input.
VOD/2 output. (2.5V)
Connected a capacitor which holds the threshold voltage of the pilot detector.
'ilot detector output.
el]
l-fel-|-t-[-]
~
lel
ea fal
nnected a capacitor for sample/hold
1.
H
°
nnected a capacitor for sample/hold 3.
Suple/hold 3 output.
ATF offset voltage input. (unused)
Connected a capacitor for sample/hold 2A.
VIN
Oo
nm
170
Connected a capacitor for saaple/hold 28.
ATF error amp inverted input.
ATF error amp output,
Capstan offset servo integrator inverted
input.
~
Capstan offset servo integrator output.
Reel offset servo control voltage buffer output.
°
Capstan offset servo control voltage buffer ouput.
Reel rising ramp voltage output,
"4 m4
O10
\}PO
\
° °
Capstan I system control voltage buffer output.
Reel P system control voltage buffer output.
Capstan P system control voltage buffer output.
~
Capstan
I system PWM input passing through an LPF.
Capstan
I system PWM output.
s
Power supply of analog circuit.
(D+5V)
Capstan P system PWM input passing through an LPF.
-
Capstan P system P¥M output.
Drua I system control voltage buffer output.
41
p49
priw it |
[30 [brew [0
[1 | _poour_f 0 |
[34 [| peout [0 |
[ssp
pry
it
[se | ppewa | o
[38]
BRAKE
ee
Cs
ea]
est
re
Lee
ere
aa
[se [Few
[es __|_atrenp_|
[es _[ swe
[0
[72 [arrate
[0
[7s
arroet | 0]
[ya
trout 0
7s |__
svour__| 0.
[ve_|_Pirrock_
| 0
[rr]
brock [0
[7e__|_ertock
[0
a eS ca BC
[~so[_epata_ ft
Description
Durm I system PWM input passing through an LPF.
Drum I system PWM output.
Drum offset servo control voltage buffer output.
Drum offset
servo PWM input passing
through
an LPF.
Drum offset servo PWH output.
Drua P system control voltage buffer output.
Drum P system PWM input passing through an LPF.
Drum P system PWM output.
Drum brake voltage input. (fixed at 4.5¥)
Drua brake control output.
("H": brake, "LL": normal)
Power supply of digital circuit.
(D+5v)
Test input pin. (connected to D+5V)
Normal mode input.
(connected to D+5V)
Reset input.
(connected to D+5V)
T reel FG input.
S reel FG input.
Envelope comparator output.
Channel clock input.
Parity signal input.
ATF END output.
Head switching ouput.
Servo reference input.
Playback signal sync clock input.
ATF aonitor during play and HUNT monitor during search.
AIF DET monitor during play and HOLD monitor during search.
PILOT monitor during play and DION monitor during search.
SYNC monitor during play and CK (PACK divided by 2) monitor during search.
PLL lock monitor. ("H": lock)
Orum lock output. ("H": lock)
Capstan/reel lock output. ("H": lock)
RF signal presence/absence status output. ("H": present)
Microprocessor transfer data input.
42
Advertisement
