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.
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shalt
ttyl
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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.

FD-42A
SECTION 1
ADJUSTMENTS
HOLD DOWN CIRCUIT CHECK
1.
Connect regurated dc power supply to DC IN
6V jack (J601).
. Confirm that the set operates when applying
7420.1V.
.
Confirm
that
the
set
does
not
operate
when
ap-
plying 8.7 + 0.1V.
Disconnect requrated dc power supply.
Connect requrated dc power supply as illustrat-
ed.
Confirm that the set operates when applying
6.0+0.1V.
. Confirm that the set does not operate when
F + OV
applying 7.2 _ 0.1V.
requrated dc
power supply
NOTE
1. Test Equipment Required
® regulated dc power supply
® color-bar/pattern generator
®@ frequency counter
® digital voltmeter
@VOM
. Input Signal
Cross hatch color-bar or off-the-air signal.
3. The adjustment should be performed with 6V dc
and about 5 minutes warmup unless otherwise
noted.
4. Position the set vertically with the front side
faced to the north for TV-section adjustments.
to
Horizontal Adjustment
. Loosen the adjustment screw.
. Tune in a test or off-the-air signal and adjust de-
flection yoke for optimum horizontal picture.
. Tighten the screw after the adjustment.
Centering Adjustment
. Tune in a test or off-the-air signal.
. Adjust the two centering magnets so that the
picture is at the center.
. Lock the magnets with locking compound after
the adjustment.

Horizontal Amplitude (H-SIZE) Adjustment
1. Tune in an off-the-air signal.
2. Adjust RV852 for the best horizontal ampli-
RV852
Vertical Amplitude (V-SIZE) Adjustment
1. Tune in an off-the-air signal.
2. Adjust RV851 for the best vertical ampli-
RvV851
Keystone Correction (KEYST) Adjustment
FD-42A
4.7V Adjustment
1. Connect digital voltmeter to Q601 collector.
2. Adjust RV601 for 4.7V reading on digital
voltmeter.
digital
voltmeter
iat
=a
Q601 collector
RV601
— D BOARD —
RV502
1. Tune in an off-the-air signal.
2. Adjust RV502 for the optimum picture.
x Oo x
RV853 | _
as #
Rv4o1 | ~
Horizontal Frequency (H-F REQ) Adjustment
1. Short-circuit between ICSO1 pin a3) and
ground with jumper wire.
2. Connect the frequency counter to ICSO1 pin
6).
RV501
3.
Adjust
RV501
for
a
15,734
kHz
reading
on
fre-
quency counter.
4. After the adjustment, remove the jumper
wire in step 1.
frequency counter
ae
RV802
Focus Adjustment
. Set the regulated dc power supply voltage to
4.8V.
. Tune in an off-the-air signal.
. Adjust RV802 for the best focus at the center
of the picture.
FD-42A
Luminance (BRT) Adjustment
1. Bridge the pattern according to the mark on
the neck of the picture tube.
mark
pattern connection
(R871)
2.
Turn
BRT
knob
(RV853)
fully
counterclock-
wise
and
then
turn
CONTR
knob
(RV401)
fully
clockwise.
3. Connect the digital voltmeter across R860.
4. Adjust the RV802 for 9.0V dc reading on the
digital voltmeter. If not, disconnect pattern
connection @ and connect ® and adjust
again.
digital voltmeter
%
ia PUSH ON é

Luminance (BRT) Adjustment
ector. 1
ligital
.
Bridge
the
pattern
according
to
the
mark
on
the
neck
of
the
picture
tube.
LJ
5
mark
pattern connection
(R871)
2. Turn BRT knob (RV853) fully counterclock-
wise and then turn CONTR knob (RV401)
fully clockwise.
3.
Connect
the
digital
voltmeter
across
R860.
4.
Adjust
the
RV802
for
9.0V
dc
reading
on
the
digital
voltmeter.
If
not,
disconnect
pattern
connection
@)
and
connect
@®
and
adjust
again.
digital voltmeter
@
“ a ih
Front
eras) ®
Nr
oO
T
Channel Display Adjustment
.
Set
the
BAND
SELECT
switch
to
VHE.
.
Turn
the
TUNING
knob
fully
clockwise.
.
Turn
the
TUNING
knob,
set
the
dial
pointer
to
the
letter
“2”
on
dial
scale.
Adjust
RV151
for
the
optimum
picture.
In
the
area
where
an
off-the-air
signal
can
not
be
tuned
in,
adjust
RV151
for
2.2V
reading
on
VOM.
...
(V.L.
START)
.
Turn
the
TUNING
knob,
set
the
dial
pointer
~
to the letter “6” on dial scale.
Adjust
RV152
for
the
optimum
picture.
In
the area where an off-the-air signal can not be
tuned
in,
adjust
RV152
for
18V
reading
on
VOM. ... (V.L. END)
.
Turn
the
TUNING
knob,
set
the
dial
pointer
to
the
letter
‘‘7”’
on
dial
scale.
Adjust
RV153
for
the
optimum
picture.
In
the
area
where
an
off-the-air
signal
can
not
be
tuned
in,
adjust
RV153
for
8.4V
reading
on
VOM.
...
(V.H.
START)
.
Turn
the
TUNING
knob,
set
the
dial
pointer
to
the
letter
‘13’
on
dial
scale.
Adjust
RV154
for
the
optimum
picture.
In
the
area
where
an
off-the-air
signal
can
not
be
tuned
in,
adjust
RV154
for
20V
reading
on
VOM.
...
(V.H.
END)
.
When
tuning
in
all
the
off-the-air
signals
(VHF
CH2-13)
capable
of
receiving,
make
sure
that
the
dial
pointer
is
correctly
set
to
the
dial
scale.
— A BOARD —
L202 L203
VIF and AFT Adjustments
1. Tune in an off-the-air signal.
2.
Adjust
L202
(VIF)
and
L203
(AFT)
for
the
best picutre.
8.
Set
the
BAND
SELECT
switch
to
UHF.
9.
Turn
the
TUNING
knob,
set
the
dial
pointer
to
the
letter
‘‘69”
on
dial
scale.
Adjust
RV155
for
the
optimum
picture.
In
the
area
where
an
off-the-air
signal
can
not
be
tuned
in,
adjust
RV155
for
22V
reading
on
VOM.
...
(U.LEND)
.
When
tuning
in
all
the
off-the-air
signals
(UHF)
capable
of
receiving,
make
sure
that
the
pointer
is
correctly
set
to
the
dial
scale.
ead
|
-
-
RV2071
RF AGC Adjustment
1. Tune in an off-the-air signal.
2,
Adjust
RV201
so
that
snow
noise
disappears
from the picture.

FD-42A
FD-42A
FD-42
SECTION 2
@
Waveforms
DIAGRAMS
pair
aii
teers
—
corp
ne
cee
epee
tn
nen
etree
tins
nat
ae
I--|
ie
5
6
en
a
ee
ae:
10_
~
2-1.
MOUNTING
DIAGRAM
fender
1
:
2
é
eS
ee
re
ah
4
i
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ea
a
fc
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z
Siete
{
12}
i
|
:
:
:
as
yore
e@
See
page
15
for
Semiconductor
Lead
Layouts.
i
:
: i
‘
:
:
|
|
‘ee
ipa
|
e
MOUNTING
DIAGRAM
Note
|
Oh
oA
ih
ay
‘
i”
@
ej{fe
:
MELF
component.
a
us
TE)
BOARD:
wen
Parag
TE
accu
eat
:
CaP
e
ee
oe
a
e
e
2
0.6Vp-p
4.5MHz
2)
28Vp-p
‘l
“
!
i
¥90i
BATT
CASE
SECTION
fa
.
AR
PHO
CRT
043M
GS
re
Pe
SCHEMATIC
DIAGRAM
Note
haa
=
ees
a
—
ev
e
All
capacitors
are
in
AF
pales
otherwise
noted.
pF:
MHF
a
i=
:
ore
_
ody
|e
Benseia
—_
4
50
WV
or
less
are
not
indicated
except
for
electrolytics
\
Het
H
dL
rer
GetleaNGN
KRIaiS
2
:
and
tantalums.
e
|
'
®
Pen
C
‘3:
0.2Vp-p
(14°
sovp-p
e
All
resistors
are
in
2
and
!/,W
or
less
unless
otherwise
|
:
‘
:
specified.
C
'
)
j
eo
memmemi>
=
=
YIDEO
signal
path.
oe
hg
care
ieee
ne
ee
os.
Al
le
ek
PPP
©
wmuseemep
-
AUDIO
signal
path.
Ne
ae
ae
se
oeteh
|
on
eae
Nev
®
wom
©
B+
bus.
po
ac
oT.
Seo.
~
me
os
to
=
Pest
v
~
2
@
(___]
:
adjustment
for
repair.
Cone
®
Power
voltage
is
6V
and
fed
with
de
power
suppiy
from
;
D
i
Sa
ne
DC
IN
6V
jack.
Voltages
are
dc
with
respect
to
ground
ay
under
no-signal
conditions.
io]
Voltage
variations
may
be
noted
due
to
normal
produc-
|
i
“
2%
|
L
L
tion
tolerances.
‘
e
©:
waveform
numbers.
i
|
L—
:
—
Waveforms
are
taken
to
ground
in
color
ber
signal
receiv-
E
&)
1.9Vpp
ing
mode
by
using
osilloscope.
hoa
Voltage
variations
may
be
noted
due
to
normai
produc-
al
tion
tolerances.
as
pass
2
| |
°
Switch
i
|
|
a
Switch
i
fon
H
ea
FY
—
BAND
SELECT
ty
(@)
Refer
to
@
“
POWER
f
|
(7)
0.44Vp-p
H
_
2st
cate
inc
a
\/\,
14v
A
5
:
G
:
|
x}
2psec
©
Semiconductor
Location
;
8°
4.8Vp-p
i
|
Ref.
No.
|
Location
|
Ref.
No.
|
Location
T
D151
G-8
Q151
G-6
ae
;
D152
|
H-8
Q201
|
G-6
Hh
re
D401
|
1-15
Q301
|
B-12
|
D501
E-14
Q302
B-12
|
|
9
o.8vpp
(9
1
veep
D503
|
E-12
401
|
B-14
{
a
fee
D601
E-16
Q402
C-14
D602
E-17
Q551
D-12
i
ag
aces
ae
es
D651
|
D-17
|
Q552
|
D-12
ney
D801
G-17
Q601
F-15
pais
cana
D802
|
H-17
|
Q602
|
F-17
r
100
avpp
20
1.svpp
=i
D803
|
H-16
|
Q651
|
C-17
ae
D804
1-15
Q652
D-17
D805
1-13
Q801
G-16
J
Sete
eo
ee
D806
1-12
Q802
H-16
i
ia
D807
|
1-14
Q803
G-16
b—»—
aa
D851
J-12
Q804
|
1-12
ae
=
aa
ore
D852
|
J-14
|
Q805
|
1-13
Q806
|
1-13
i
ists
ee
OR
1C201
1-3
Q851
J-12
K
rk
=
7
By
1C451
B-16
Q852
1-14
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|
3
4
5
6
:
7
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Seamer
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faqs

FD-42A
FD-42A
[D BOARD]
A,
[EJ BOARD]
BATT CASE SECTION
ORY BATTERY
UM- 2x4
, 6VDC
+ SIZE “e"
(IEC DESIGNATION R14)
' 4 PCS 6V
¥ 901
CRT O4JM
[om
uF
cs
se
[C BOARD }
BAND SELECT
othess
ae
a
ea
ia
: I
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