Philips 523 ub service manual

Page 2

PHILIPS

1104

523 U B
l Aeprox. l
OTHER COMPONENTS lilies Loca-
(ohml) tlous
Y1- - n.w. mm aerial 1'0 -
L2 L.W. inrne serial . .. 10 . -
L3 M.W. loading coil. 3'0 AI.
L4 L.W. loeding coil. 34-0 Al
LE LI". filter . 28-0 A2
{3 Oscillator tun. coils $33 2;
LB Oscillator reaction H) Al
L9 coils 1).... 1:12 i 2;
L10 . r . - .
L11 1st LF. trans 5;. l 138 1 fig
L12 Ii. r '
L13 2nd I.F. trans. Sec. 12,0 . B2
L14 Spccch coil .. 3'0 --
T1 0.1). trans. 5;; 533° 32
SIASIZ Waveblnd swiwhes - CM
'53) Mains/battery C2
3 IN) switches
l 319 A l D3
sh) Butt. recharge s.
$21.4 Ou/ofi switch . in

F1, le loomum . - cl

VALVE ANALYSIS

Valve voltages and currents given in the
table I'l'lnw are derived from the manufacturers"
information and are the avenge of readings
taken on a number 0! receivers. which were
operated from 241V AC. mains. the voltage
adjustments being set to the 245 V tapplngs.

Voltages were measured with a valve volt-
meter. and as this type of instrument has a
high internal resistance. allowance should in
made [or the current drawn bly other types or
motel. uhnssir was the nrgut ve connection In
each case. Total input current on mains was
136 mA.

l Anode l Srreen
Valve ___. -.-
l mA v mi
V1 DF91 in 1-5 43 7
ss 0-7
V2 DKQ2 Oscillator 56 r NEE)
' l 015
vs DEM .. RH 15 so no
V4 DAF9I . 20 0-07 l 18 Wt!
V5 mm 32 5'9 Rn l-fi .

No reading quoted.

GENERAL NOTES

Switch . 51-51: are the wavebnnd switches.
ranged in single unit beneath the chassis.
Its waitiofl is indicated in our undcr~chnssls
illustration. and e detailed drawlng oi the unit
is inset In the top leit»hand corner of the cir~
cult diagram overleal. The associated 5w ch
table in column 2 gives the switch p05 us
{or the two control settings, starting from the
fully anti-clockwise position of the control
lever. A dash indicates open, and I. closed.

811(M)-ll1(8), snarl) are the'maim/hat-
tery change-over switches, ganged lli n second
lever-operated unit. mounted on a bracket at

Supplement to Wireless (5'
€12:trical__1_'71dir,__fiuglglwl, 1953

#l
lSwltches M.w.l ow.

OIOIOIllOlOI

812

stcband switch table.
The diagram is over-

.r'rrriiEi.

leaf

the rear of the chassis. Tins is indicated in our
plan View of thc chas 5. null shown in dctuil
ut the right or the circuit diugram. The null
is spring-loaded and in its normal position (lcvnr
iully anticlockwise when viewed iron: rcrtr) the
receiver ls switched to mains o oration, and all
the switches with the sumx ( ) close. When
the lever is turned fully clockwise, the (I)
switchers close lor battery operation.

To hold the unit in this position. the milins
vlu? Is inserted in the Mains Plug Recepr
tac c " which we indicate in the plan View of th
chassis, when the pins lock the switch in posi-
tion. By this device the mains cannot be con
coated to the receiver while it is switched for
Imttery operation. The receptacle will nccept a
standard 5A spin plug.

Sin, 3211 are the hailery ohurge switohe.
comprising a Q MIL unii mounted on the volume

Front view of the
drive system, gang
at maximum.

Hf, _._._ \w

) . 3 dmmnd

L ,-,,f, , flmr

control spindle. and operated by a control lever
concentric with the volume control knob. In
order to prolong the life of the 11.1 battery
the char e circuit is brought into oncratlon
hy switch in; the receiver to mains operation and
turning the charge control lever to "Butt.
Charge" (fully clockwise). The receiver can
then be switch"! on. and the 1LT. buttery
trickle-charged.

In order to operatc the receiver normally from
Innins, the rlcllurge switch should in: set to
" Mains." when the receiver Is opernted from
hatteries, it does not matter In which posmou
the control is set. .

$21-51! are the QJrIJL "oniofl" switillleS.
winged with ihe volume control R18.

Frunl Avian-The MW. (outer) frame wlml~
inn LI and the LW. (inner) winding L2 are
mounted on the hack cover oi the can ing use.
together with GI, 02 und the A and sockets.
A piece or copper ioil secured licncath the lower

r

Undersid: View of the chassis.

R14 is hidden in a plastic sleeve.

7 Prinlzd n. EnglandTy'cmiuall pm; Ltd. pan? 'carim, Layton.

Plan View of the chassis.

half 0' LI provides u smltli coupling l-nlrru'ltnlli-p
by whll'h to inject a. signal iron: an external
ncrllil {or M.W. operation. 011 L.W. the ox-
tcrnnl aeriul socket is coupled to the junction of
LI und Ll.

Connections from the chassis to the buck
cover are made by live coloured leads to sockets
hearing similarly coloured paint spots. Bending
lrom top to bottom. the trance sockets are: 1.
orange; 2. grey: 3. black; 4, green; 5. hrown.

Blflnriel.7TiIe LT. batteries recommended
are two Evcr Ready All Dry 25s r' ed at 4.5V
well, or the equivalents in other rrlzlk ' mulling
V. The 1LT. huttcriis recommended llrc two
Ever Ready BIO-15 rated at 45V each. or the
equivalents in other mu making on v. (LB.
is automatic. All thn hilt! rins fit into the has
of the Cnrlyillx Whit. IIJI. liutivrir's iii the but
iron, null or, hutturlos on top. where they
are secured hy lilt' metul buttery clip .rnll
IiIillllIllMl'flW.

Volllge AdjustmentiThrr-e positions of volt:

agr- niljnhimluit .m- prnridrd on n sp ial rotary
pluc. the voltage setting being that adjacent
to the V embossed in the top of the mount
ing plincl.
DrIVI com null-cement. *Abuut 3 [out cl cord
is required, and it should be made up with u
looput cuch end to mlltsurc 32in ovornil. using
spccml metal collars to clamp the ends. Run
on as xhowli in the sketch (Col. 2), starting
anticlockwise round I.Ii|' drum.

CIRCUIT ALIGNMENT

I.F. filletiltemovc ('IIRSSIS from cnhinet 1nd
stnnd it on its metal rectifier end. Switch
receiver to M.W. nud turn gong to minimum
capncitnnce. Connect, signal numerator output.
via an 0.047 nIV capacitor in the livc " lcnll, to
control grid (Din ii) at V2 und chass Feed in
it 470 he]: (649.3 m) signal null ailjllsr the corps
or Lia, Liz (location reierem-e he) and Lil. L10
(A2) for maximum output. Repeat thew udjlmi
merits.

l.F. Flinn-Transfer live" signal genera-
tor lead, and aim in Cllpllcltor. to control Krill
min a) of v1. Fin-ding in n 470kc/s signal,
lidjust the corn oi La (A2) for minimum out-

put.

Oscillulcr Stage. (Ilcrk [hilt with the filing
lit llillKlmllm capacitance the cursor coincides
with [he m " at the hilrll wrlvl'lenuirll cm! 0!
(he lbw. tuning scale. With the siglllll genera-
tor live leud rorruerlrd to v1 routrnl grill,
Carry out the i'nliuvliux :liijirstlncllts.

M.W. . 'iich wet in M. , and iler gnng
to um um cnpnc nnlo. Food in n sillkr/r
(555.5 In) siznnl nnil adjust the core of L6
(Al) ior maximum output. Turn gong to mini-
mum capacitance, feud ill a 1,585 lie/5 89.3 in)
signal and adjust ass (G2) {or maximum out»
not. Repeat these illuwuuontli.

L.W.7SWit€h rcuul u in LIV. rind turn Rani!
to muxlmum capacitance. Food in .1. Hoke/s
(2.143 m) signal and whilst the core of L7 (Al)
{or minimum output.

I'LF. Stigm-(onnert the Irume Mriuls llllil
place the hack covcr Min from the roar of the
chassis. with the batteries lirrnnued in thi'il'
normal positions relutivu to the "rum: acrials.
Transfer signal Konerlttrlr lends to Ll loop 07 wirc
taped in position (in the hack cover (.1 lairly
lame gcnerutor output will he need-2d).

M.W.7Switlh rirein-r in l\I.\V., lead in a 600
kc/s (500 or) signal. tune in receiver and ail'ust
the cirrc of L3 (in) fur maximum output. foil
in a 1.500 krls (son m) signul, tune in receiver
and adjust 012 (Gil) for maximum nutrmt.
urneut these adjustments.

L.W.-Swit h rccciver to Ll, Iced in a 15"
103's _.00llrn) .ignrtl nlld lllljll=t the run- ni Ll
(Al) {or mi mum (-Ilillut.