Sony FD-42A User manual

SFRVICEMANUAL
oo
5~
3
3~—
usec
Canadian Model
E Model
SPECIFICATIONS
TV standard American TV standards Dimensions Approx. 127x216x66mm (w/h/d) incl.
TV channel coverage projecting parts and controls
VHF channels 2-13 Weight Approx. 1.2kg (2 Ib 11 02) incl.
UHF channels 14-69 batteries
Antenna
VHF/UHF
telescopic
antenna
Approx.
0.93kg
(2
Ib
1
02)
not
incl.
Picture tube 10-cm (4-inch) picture measured batteries
diagonally
Speaker
Approx.
5em
(2
inches)
dia.
FEATURES
Input US,E model: EXT ANT (mini jack),75 ohms e Miniature B/W TV for portable or desktop use.
unbalanced e 4-way power supply capability.
Output Earphone jack (minijack) @External antenna jack for home and car use. (US, E model)
load
impedance
8—300
ohms
}
Battery life NOTE: Use only an AC power adaptor or car battery cord
manufactured by Sony. The polarity of the plug of
Battery approx. hours other manufactures may be different.
Sony SUM-2 (NS) 1.5 A) - Polarity of Sony plug
Sony AM-2 (N) 5 ow
Rechargeable NC-C2 2
Power comsumption
3.2W (6V DC)
Power requirements
6V DC:
Batteries
four size C (R14P) battery
DC IN 6V jack accepts:
AC-D4L AC power adaptor
for use on 120V ac, 60Hz
vecwnertrce™
"FLAT
BLACK
AND
WHITE
TV
SONY.
B.W
MICROFILM

FD-42A
TABLE OF CONTENTS
Section Title Page
Specifications... 20.0 is Age wl Bae ee, Apes oes Shae ea ales Ba i
Safety: Check-Out:.uc sro wee aie Pate ae Oe deta we pte 3
Precaution for A Board Replacement ..............--.-2-0.00-- 4
Note on the Anode Cap Removal. ... 2... 0... 000002 e ee eee 5
Parts- Identification: ig ec chuck ea Ae Sepak ae Bae Ve a at 5
SECTION 1. ADJUSTMENTS....................-..-..2-. 6
SECTION 2. DIAGRAMS
2-1. Mounting Diagram. .............2--- 0000-0 e eee 10
2-2. Schematic Diagram ..... 2.0... we es 13
2-3. VHF/UHF Tuner Unit Schematic Diagram............. 15
SECTION 3. EXPLODED VIEWS AND PARTS LIST.......... 17
SECTION 4. ELECTRICAL PARTS LIST.................. 21
|
FD-40A disassemble and dial string procedures |
are available for this set. See FD-40A service |
manual.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
A ON THE SCHEMATIC DIAGRAMS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR !N SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET
UNE MARQUE A SUR LES DIAGRAMMES SCHE-
MATIQUES ET LA LISTE DES PIECES SONT CRITIQUES
POUR LA SECURITE DE FONCTIONNEMENT. NE REM-
PLACER CES COMPOSANTS QUE PAR DES PIECES
SONY DONT LES NUMEROS SONT DONNES DANS CE
MANUEL OU DANS LES SUPPLEMENTS PUBLIES PAR
SONY.

FD-42A
SAFETY CHECK-OUT
After correcting the original service problem,
perform the following safety checks before releasing
the set to the customer:
1. Check the area of your repair for unsoldered or
Check the entire
board surface for soider spiashes and bridges.
poorly-soldered connections.
2. Check the interboard wiring to ensure that no
wires are ‘‘pinched” or contact high-wattage
resistors.
3. Check that all control knobs, shields, covers,
ground straps, and mounting hardware have
been replaced. Be absolutely certain that you
have replaced all the insulators.
Look for unauthorized replacement parts, par-
ticularly transistors, that were installed during a
previous repair. Point them out to the customer
and recommend their replacement.
5. Look for parts which, though functioning, show
obvious signs of deterioration. Point them out
to the customer and recommend their replace-
ment.
6. Check the line cord for cracks and abrasion.
Recommend the replacement of any such line
cord to the customer.
7. Check the condition of the monopole antenna
(if any).
Make sure the end is not broken off, and has
the plastic cap on it. Point out the danger of
impalement on a _ broken antenna to the
customer, and recommend the _ antenna’s
replacement.
8. Check the B+ and HV to see they are at the
values specified. Make sure your instruments
are accurate; be suspicious of your HV meter
if sets always have low HV.
9. Check the antenna terminals, metal trim,
“metallized” knobs, screws, and all other
exposed metal parts for AC leakage. Check
leakage as described below.
To Exposed Metal
Parts on Set
|
se eed
AC
0.75 pF 15K vo/tmeter
{0.75 V)
= Earth Ground
[Fig A. Using an AC voltmeter to check AC leakage.
—3—
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5SmA (S00 microampers). Leakage
current can be measured by any one of three
methods.
1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers’ instructions to use these instru-
ments.
2. A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.
Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The “limit” indication is 0.75V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
HOW TO FIND A GOOD EARTH GROUND
A cold-water pipe is guaranteed earth ground; the
cover-plate retaining screw on most AC outlet boxes is
also at earth ground. If the retaining screw is to be
used as your earth-ground, verify that it is at ground
by measuring the resistance between it and a cold-
water pipe with an ohmmeter. The reading should be
zero Ohms. If a cold-water pipe is not accessible,
connect a 60-100 watts trouble light (not a reon
lamp) between the hot side of the receptacle and the
retaining screw. Try both slots, if necessary, to locate
the hot side of the line, the lamp should light at
normal brilliance if the screw is at ground potential.
(See Fig. B)
Trouble Light
a Ohmmeter
- AC Outlet Box
Cold-water Five
Fig. B. Checking for earth ground.

FD-42A
PRECAUTION FOR A BOARD REPLACEMENT
(Only for Canadian Model)
Perform this parts replacement only for |
Canadian model. |
EXT ANT (external antenna) jack J101 is mounted
on A board for repair, but J101 should not be used in 2
Canadian model. In case of Canadian model, perform
the following procedure.
Install jamper.

FD-42A
be ee
NOTE ON THE ANODE CAP REMOVAL
Even
when
the
power
switch
is
off,
the
voltage
at
2.
Pinch
and
remove
the
anode
pin
with
a
pair
of
the
anode
cap
is
still
high.
tweezers.
Remove
the
anode
cap
as
follows.
At
this
time,
be
careful
not
to
scratch
the
anode
1.
Discharge
the
anode
pin
to
the
ground.
button.
anode pin
anode
cap
\
anode button
Caution on Reinstallation :
Confirm that the anode button is inserted into the anode cap
securely.
tl
shalt
ttyl
lt
clit
al
hcl
th
ltl
tl
ltl
lt
latch
lll
cl
hl
Atel
ltl
Hl
al
At
Atl
cA
al
cl
al
PARTS
IDENTIFICATION
Speaker
: BAND SELECT switch
Telescopic antenna
US,
E
model:
POWER
switch
EXT ANT (external antenna) _______-»-} [
jack (left side)
CONTR
(contrast)
control
eee
4
(left side)
VOL (volume) control
Tuning knob
BRT (brightness) control ~
(left side)
Dial scale
DC IN 6V (external power
input) jack
‘ae Battery compartment (rear)
Screen
EARPHONE jack
CONTR (contrast) control BRT (brightness) control
The
picture
contrast
becomes
stronger
by
turning
gy
Turn
the
control
counterclockwise
for
more
bright-
the
contro!
counterclockwise,
and
is
reduced
by
|
ness
and
clockwise
for
less
brightness.
turning it clockwise.