Panasonic SA-AK15 - Preparation for Repair and Adjustment; Traverse Deck Handling Precautions; Electrostatic Discharge Prevention

SA.AKl5
:
WARNING
This
servlce information
is
designed for
experiense
repair technicians
only and is not
designed for
use by the
general public.
lt does not
contain
warnings
or
cautions
to advise non-technical
individuals
of
potential
dangers
in attempting
to service
a
product.
Products
powered
by
electr¡city
should
be serviced
or repaired
only by
experienced
professional
technicians.
Any attempt
to service
or
repair
the
product
or
products
dealt
with
in th¡s
service
information
by anyone
else could result
in serious iniury
or death.
I
Gontents
BEFORE
REPAIR
AND ADJUSTMENT
..........
HANDLING
PRECAUTIONS
FOR
TRAVERSE
DECK
.....
SAFETY
PRECAUTIONS
..
PROTECTION
CIRCUITRY
PRECAUTION
OF LASER
DIODE
ACCESSORIES
CONNECTIONS
FRONT
PANEL
CONTROLS
.....
SETTING THE
TIME
LISTENING
TO
COMPACT
DISCS
(PROGRAM
PLAY)
LjSTENTNG
TO
COMPACT
DTSCS
(CD
MANAGER
FUNCTTON)
....
BEFORE
RECORDTNG (DECK
2
ONLY) ...
..........
RECORDING
FROM
COMPACT
DISCS
REMOTE
CONTROL BUTTONS
& FUNCTIONS
OPERATION
CHECKS
& MAIN
COMPONENT
REPLACEMENT.....
SELF.DIAGNOSTIC
DISPLAY
FUNCTION
CD TEST
MODE FUNCTION
I Before
Repair
and
Adjustment
Disconnect
AC
power,
discharge
both Power
Supply
Capacitors
C504 and
C505 through
a
10O
,
5W resistor to
ground.
DO
NOT
SHORT-CIRCUIT
DIRECTLY
(with
a screwdriver
blade, for instance),
as this may
destroy solid
state devices.
After repairs
are completed,
restore
power
gradually
using
a variac,
to avoid
overcurrent.
Current
consumption
at AC 120V,
60
Hz,
in NO
SIGNAL mode
should
be
-450
mA.
I
Handling
Precaut¡ons
For
Traverse
Deck
The laser
diode in
the traverse
deck
(optical pickup)
may break
down due to
potential
difference
caused
by static
electricity
of clothes
or human
body.
So, be
careful
of electrostatic
breakdown
during repair
of the traverse
deck
(optical pickup).
2
2
3
3
3
4
4
5
.
Handling
of traverse
deck
(optical
pickup)
1. Do not
subject the
traverse
deck
(optical pickup)
to
static electricity
as
it is
extremely
sensitive
to electrical
shock.
2. To
prevent
the
breakdown
of the laser
diode, an antistatic
shorling
pin
is
insefied
into the flexible
board
(FFC
board).
When removing
or connecting
the short
pin,
finish the
job
in
as short
time
as
possible.
3.
Take
care not
to apply
excessive
stress to the flexible
board
(FFC
board).
4. Do
not turn
the variable
resistor
(laser power
adjustment). lt
has already
been adjusted.
.
Grounding for
electrostat¡c
breakdown
prevention
1.
Human
body
grounding
Use the
anti-static wrist
strap
to discharge
the static
electricity from
your
Dooy.
2. Work
table
grounding
Put a conductive
material (sheet)
or steel
sheet on thearea where
the
traverse
deck
(optical pickup)
is
placed,
and
ground
the sheet.
Caution :
The
static electricity
of
your
clothes will not
be
grounded
through
the wrist
strap.
So, take care not
to let
your
clothes
touch the
traverse
deck
(optical
pickup).
Caution when
Replacing
the Traverse
Deck:
The traverse
deck has a
short
po¡nt
shorted with
solder to
protect
the laser
diode against
electrostatics
breakdown.
Be
sure to
remove
the
solder f rom
the
short
point
before making
connections.
Page
2
MEASUREMENTS
AND
ADJUSTMENTS
TERMINAL
FUNCTION
OF lC's
WIRING
CONNECTION
DIAGRAM
BLOCK
DIAGRAM
TERMINAL
GUIDE
OF lC's. TRANSISTORS
AND DIODES..
SCHEMATIC DIAGRAM
PRINTED
CIRCUIT BOARD
TROUBLESHOOTING
GUIDE
MECHANISM
PARTS LOCATION
(RAA34O7)
Page
19-20
21
-23
24
25-
31
32
32-45
qO -
J I
52
53-54
55
55
56
57,58
59
-
6.t
62-65
66
ol
5
MECHANISM
PARTS 1IST............
6
LOADING MECHANISM
PARTS
LIST ,...........
7 CD LOADING
UNIT PARTS
LOCATION
7-8
CABINET PARTS LOCATION
9
REPLACEMENT
PARTS LIST
............
10
-
15 RESTSTORS
& CApACTTORS
...........
16
-
17
PACKING
MATERIALS
&
ACCESSORIES
.,,........,,.........
18
PACKAGING,,,
f:FC
board
Lens
(Do
noi
touch)
Short
poinl
Optical
pickup
No.
@
(GND) pin
No.
€)
(LD) pin
Variable
resislor
(Do
not
turn)
Wrist
strap
-\--7
(Anti-:19!9
ilegqglll
lron
plate
or some
metals
to
conducl
electr¡city
-2-