Motorola 51L1U Schematic

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Product Information:
Model:51L1U
Manufacturer:Motorola (Galvin)

Schematics Content:

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Page 1:

__.& >LA PAGE 22 77
>>Y fum `~;" M ,> _ >, __ ' ;3
(C)J?hn F. Rider

Page 2:

RAGE
MODELS ,
Q.. ' - Q Too
' Sis 3 5 1 , 3- 5

Page 3:

MOTOROLA PAGE 22-73
AMP
MODELS 5Ll, 5LlU, Rev.;
sums
LOOP
9 moo KC
____. _ B AF AMP
AMP co~v_
(C) PRI. from
FIGURE 2. TUBE Arm 'rlrillunzlz DOCATIONS
SERVICE NOTES
GENERAL
The Chassis of this receiver is isolated frorn the AC
power line circuit by nespeeifor-ehoke assembly fb elim-
inate the shock hazard when handling the receiver. How-
ever, as an additionalprecaution when aligning or servicing
the receiver from AC, an isolation transformer should be
inserted between the power line and the chassis(
The tubes are exposed when the rerir cover is opened.
It is not necessary to remove the chassis to replace tubes.
T0 REMOVE THE CHASSIS FROM THE CABINET:
l. Pull off the two control knobs on the front of the cabinet.
Z. Open the rear cover and remove the batteries.
3. Disconnect the two loop antenna leads from the chassis.
4. Remove the two hex head screws holding the chassis to
the cabinet ("A" ~ "A" in Figure 1).
5. Slide the chassis from the cabinet.
PRODUCTION REVISIONS
The following revisions in the chassis and cabinets have
been rnede from early prodiiefion receivers:
1. Alternate IF and diode frensforrners have been added,
with Connections as shown on the Circuit diagrams. Elec-
frieelly, the original and fhe alternate transformers ere
z. A multiple eepeoizor-resistor plate is used in sorne
chassis to replace several resistors and eepseifors in the
eddie circuit. Refer to the appropriate oironif diagram
when servicing ri chassis.
3. A battery retainer spring, which elips to the rear edge
ofthe ehessis, hasbeen provided for fhe 5.T1 and 5Jz series
models to prevent fhe "B" battery frorn foreing off the rear
4. The rear cover locking clips on the early 5Jl end 512
series models were replaced with 3 different type to pro-
vide better locking. The new type elips are interchange-
able with the old olips.
REAR COVER HINGE INSTALLATXON
The proper method forinstalling n new hinge in the 5I_.l,
5142 end 5lLlU, 51LZU series is ehown in Figure 3. Nofe
that the under side of the cabinet should rest on an iron
block duringthe heating process to prevent fhe formation of
s heel bubble on the bottom of the eobinef.
ee?"? APPLY HEAT AT
`e? rms POINT SE/MJN6
BLOCK
` FIGURE 3. '
E HINGE INSTALLATIUN Fon 5L1 Am: 511.111 SERIES
(C)John F. Rider

Page 4:

PAGE Z2-74 Moronom
MODELS 5Ll, 5LlU,
FIGURE 4. 51.1 AND 51.12 REAR VIEW
IF AMP
FIGURE 5. 51L1U AND 51L2U REAR VIEW
(C)John F. Rider

Page 5:

MOTOROLA PAGE 22-75
MODELS 5Ll, 5L1U, Rev-;
FIGURE 6. SJIU AND 5J2U REAR VIEW
ummm 7. us-224 .nm as-250 Top vmw or c:mss1s
(C)John F. Rider

Page 6:

PAGE 22-76 MOTOROLA
HASSIS HS-224 AND HS-250 SHOWING MULTIPLE CAPACITOR PLATE
FIGURE 8. BOTTOM VIEW OF C
S-1224 AND HS-250 SHOWING MULTIPLE CAPACITOR-RESISTOR PLATE
FIGURE 9. BOTTOM VIEW OF CHASSIS H
(C)John F. Rider

Page 7:

MOTOROLA PAGE 22-83
Rel . Part
Description
MODEL 51LZU CABINET PARTS - Same as 5L2 & 5L2U
N0 . Number
Mount 5Jl a 5JlU
Cover, cabinet back: less
latch spring and loop an-
Knob, tuning: maroon plastic
CABINET PARTS
Bracket, chassis support
(on sides of chassis).....
Bracket, hinge mtg: black
nickel finish (inside
cabinet front) ............
lite (on handle mtg cover)
Button, plug: black .....
Cabinet, front section:
less grille, loop and
front cover; black plastic
Clip, cabinet locking (on
front section of cabinet)
Clip, cabinet locking (ou
rear cover) (replaces
Cover Assembly, cabinet
back: complete with 'locki-
ing clip and stop cord;
black plastic ...........
Cover and Loop Assembly,
cabinet front: complete
with hinges and medallion;
black plastic .............
Cover, cabinet front: less
medallion and loop; black
plastic ...................
Cover, handle mtg: brass
plated (over ends of
Frame, grille: satin brass
finish (around top of
speaker gri1le).._ ...... ...
Frame, grille: satin brass
finish (around bottom of _
speaker grille). ..,,... ..
Grille, speaker: green
Handle, carrying: black
plastic; less spring ......
Hinge Assembly, front cover:
complete ........... . .... . .
Knob, control: green plastic
Lead and Eyelet -Assembly:
white (loop lead) ........
Lead and Eyelet Assembly:
green (loop lead) ...... ..
Lug, soldering: #6 hole
(loop lead connector-on
loop panel) ..........,
Medallion: brass plated (on
front cover) ..............
Plate, handle mtg (under
ends of handle) .... ..
Plate, loop panel support
(under loop hinges on
loop panel) ...........
black nkl (mounts hinge
to loop panel) .... :_
MODELS 5Ll, 5LlU, ?@v>>;
Ref. Part
No. Number Description
plain hex head (handle
3/16; plain hex head
(holds hinge to hinge mtg
3s490o1s Screw, sheet metal: #2 x ?;
PKZ; phillips flat head;
blk nkl (mounts loop to
front cover) .........
229 3SBl36 Screw, sneer metal: #4 X ?;
PKZ; phillips round head;
blk nkl (chassis support
3S400036 Screw, thread cutting: #6
x ?; PKF; slotted binder
head (holds hinge mtg
3S488OfV9 Screw, thread Cutting: #6
x 3/S; type 25 plain hex
head (mounts chassis to
2S49OS40 Speednut: for l/16 Stud;
black parkerized finish
257092 Speednut: for .125 stud;
black parkerized finish
(spkr grille mtg) .....
234 2S490842 Speednut: for .271 stud;
black parkerized finish
(holds cover stop cord)
235 4214600663 Spring, battery retainer..
4lA69205O Spring, handle (inside
plastic handle) ..........
MODEL SJ2 X: 5J2U CABINET PARTS - Same as 5Jl except
241 38K600402 Button, plug: green .....
242 l6K600409 Cabinet, front section:
less gr111e, loop and
front cover; green plastic
243 lX60043S Cover Assembly, cabinet
back: complete with lock-
ing clip and stop cord;,
green plastic ............
lX600435 Cover and Loop Assembly,
cabinet front: complete
with hinges and medallion;
green plastic ........... ..
l5K6004l4 Cover, cabinet front: less
medallion and loop; green
plastic ...................
l3K600408 Grille, speaker: black
plastic .................
247 55K60040l Handle, carrying: less
spring; green plastic .....
36K60OE59 Knob, control black plastic
557773 Rivet: .122 x 7-/32 Stl; ant
copper (mounts hinge to
loop panel) .......
SS3389 Screw, sheet metal: #2 x 1
PKZ; phillips flat head;
Statuary bronze finish
(mounts loop to front cover)
(C)John F. Rider

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