Philips FR752/00 - Service Test Program

SERVICE TEST PROGRAM - uPD78044AGF
4. Input/Output Terminal Functions
[PinNo.[
Symbol
[Description
SSCS
8
[Von
|
+5V
powersuppy.
SSS
11/12
CLK/DATA
CLOCK/DATA
output
for
TDA7313,
TC9176,
NJU9701,
LC7821,
LM7001
and
MC
14094.
LC7821 Chip enable output for LC7821.
TDA7313 Chip enable output for TDA7313.
15
PROTECTION Signal input for protection.
If
it
is
low,
all
channel
mute
signal
levels
are
turned
to
high
to
protect
speakers and this unit.
At
abnormal
condition,
after
3
seconds
elapses,
it
does
check
protection.
TC9176 Chip enable output for TC9176.
RESET Input for resetting CPU.(At "H", it is active)
OTHERS
[a
[A
_|
A
Previous
state
|
18/19
VCR
IN
1
Output
to
select
the
video
signal
VCR1
or
VCR2.
NCR
IN
2
|
3
Last
memory
function
is
available
REMARKS
ae ee eae
Pvers
[tf
aw
SC—~S
Output data for each mode is as follows.
Analog ground
Output
is
low
level
under
the
following
conditions.
1. When power is turned on or off.
RDS RESET _| Input to select LC7073.
24
MC14094
STROBE
|
Chip
enable
output
for
MC14094.
SELECTOR
_|
Input
to
select
FR-732RDS.(At
"H",
it
is
active)
2.
When
function
is
changed.
25
CH.
MODE
_|
Output
for
setting
of
PRO-LOGIC
,3-STEREO
mode.
22 MAIN MUTE Output for main mute.
3.
When
"-co
mute
signal"
is
received
from
the
commander.
According
to
each
mode,
data
output
is
as
follows.
MODE OUTPUT
3-STEREO High impedance
PRO-LOGIC H
OTHERS E |
CENTER MUTE
Output for center mute.
Output
is
low
level
under
the
following
conditions.
1. When power is turned on or off.
2. When center mode is turned on or off.
3. When center mode is switched.
4.
When
test
tone
mode
is
switched
on,
or
when
output
is
not
directed
to
center.
5.
When
"-co
mute
signal"
is
received
from
the
commander.