Zenith royal 400

Page 1

VOLUME R-22, @T-OFIEN-PXEEDED 1962 RADIO SERVICING INFORMATION
ZENITH RADIO Model Royal 400, Chassis 7GT4OZ2, Continued

(Continued on the
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CHASSIS, WIRING AND COMPONENTS VIEWED FROM WIRING SIDE

152

Page 2

VOLUME R-22, MmT-OFTEN~NEEDED 1962 RADIO SERVICING INFORMATION
ZENITH RADIO Model Royal 400, Chassis 7GT40Z2, Continued

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PM? TRANSISTORS

W", m." m mm H u cuAssrs INFORMATION CHART

mm mm mm n u,

Transistor Crystal
22:31.52 33. amok; Chassis Layout Part Diode Output- Supplier
5" Chassis Color Dot Label No. Mixer Osc. lst LFr 2nd [Fl Detector Driver Output R.C.A.
n: In Color
Black Zmlth 121479 121-135 121-80 121-181 103-19 121-64 12:53
7611022 Bllck 102-3126 RETMA 2N1527 ZNISZS 2N1525 2N1525 1N87G 2N407 2N407 R.C,Al
Type PNP PWP PM? PM? PNP PNP
! vs This trans istor portable chassis is a conventional super-
n N :I 2| heterodyne receiver using an individual mixer and as-
uru u u cillator to reduce the 455Kc intermediate frequalcy.
P
am.» méft/ The first and second intermediate frequency amplifiers
are conventional. A (103-19) is used as the diode de-
tector and AVC voltage source. This is then followed
by a driver stage and a class B push-pull output
stage. As you can see from the chart, the chassis uses
mum Pmruumrmu a pair of matched transistors in the final output stage
and therefore should one transistor fail, both transistors
W H_,, ,5, must be replaced simultaneously as chances are they
) reign mm will not perform properly unless so matched.
to!
a. m 'v .3 ALIGNMENY PROCEDURE
nu , .
s c r Cundct c towers!) in
mm-0 .. own... ::;;::; $3.: 333nm 4° 35%.. mi: SerDiAlAt 1m"...-
5" Quill-tor To
Ch an 600 KC Ad). rxcrz.
now mung [-um Lr, I 55 Kc " 13 [or maxi-
mum ONE mllm amp-n.
TURN _ nut
2 1620 KC Loose _ _u.n. c...
'63- comzu-zn 'MOM- .
" 3 535 KC 1° cu; Adjust slug
(mm: Q- uvsmcnar - Chad in 15
'L) l 4 REPEAT _ _
© sraPszas " r
TRANSISTOR In TRIMMER lAYOU'I 5 mo Kc - 1250 KC cu

153