United Motors Service - Delco R1231A Schematic

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Product Information:
Model:R1231A
Manufacturer:United Motors Service - Delco

Schematics Content:

Please note: this content is a computer-generated interpretation of the above schematic and is provided only to help assist you in locating this schematic. For the actual text, please consult the schematic above. Thank you.

Page 1:

(C)John F. Rider
osc||_LAToR-|mou\_/non 1.5 AMPLIFER ann oEIAvc` a Aumo BEAM OUTPUI ,S
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' 3 | - | ' , _ onus 5 3 9 ? U 1
YELLOW _ / U O 5
AND B__ VOLTAGE TQLERANCE ls t'D%_ l 24 E (D) '5 05 SOLS |2SA7 |2?K1 |2507 H 2 OM. H 1 Y;
um 12 vous asrwzen rms nan ' % (R) (B) N _ _zo , 5 w *i
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23 ;s?(;nETB?;:LocATN;s<;EL:rr? aa onus '""'"? "NGE ' ' ' 54? T? "'2? K ?' g'

Page 2:

E 1 - NITE M TORS
MODELS R125O, R123OA, UNITED MOTORS SERVICE
R1231, R1251A, R1252 DIV. OF GENERAL MOTORS CORP.
T0 B' GROUND
CHASSIS GROUND _
GRAY T0 CHASSIS
enema emo
OSCILLATOR COIL
GREEN V
'asm PLATE |zso1 mon:
|2507 CATHODE I
B+ 2? owns LOAD
VOLUME CONTROL
RED 47 M
SECOND I. F. TRANSFORMER
PART #22 UNSHIELDED
p0|N'|'ER GQRD MODELS R~1230, R-1231 and R~12s2
2-|/ 2 TURNS
DIAL s'r|uNG DRAWING
BOTTOM VIEW OF CHASSIS
DO VOLTAGES MEASURED WITH ZOQOOO./\_/VOLT VOLTMETER
BETWEEN SOCKET TEWMINALS AND B
A_C~L|NE VOLTAGE M7 VOLTS
(A) I2 VOLTS BETWEEN Plus Haw
(B) 55 VOLTS BETWEEN PINS N an!
(C) 50 VOLTS BETWEEN P N5 a
(D) 6 VOLTS EETVIEEN P|N5 H28 3
(E) METER STOPS LOCAL OSC\|.LAT0R
VOLTAGE TOLERANCE IS :lol
TUBE SOCKET VOLTAGE CHART
@John F. Rider

Page 3:

UNITED M TORS ?ERVI'CE Moms 21250, R12Z5OA,
DIV. OF GENERAL MOTORS CORP. R1251, mzsui, mesa
sac Pm. .-| la - sec W U ~ -
PARTS LAYOUT - TUBE VIEW PARTS LAYOUT _ TUBE VIEW
MODELS R-1230A, R-1231A MODELS R-1230, 3.1231
AND R>>1232A AND R-1232
LOOP I > Eben- T'
PARTS LAYOUT - cl-IAss1s VIEW PARTS LAYOUT ' CHASSIS VIEW
MODELS R-1230 R-1231 `
MoDsIfN1S1?el\?;& is-1231A AND R_ 125 2
Output Mere: Connections ....__. _
Generator Ground .........,A,........
ALIGNMENT PROCEDURE
Dummy Antenna , ,,,..__ .,,,, _ .,._..__,.._...
_...___..._......_....,........_..._........_____._..,...Across Voice Coil Winding
__ .I......_..To Chassis through .01 MFD
_.._..,.._.._._.In Series with generator
Volume Control Position ..._. _ ....._Y, ..........I...._..._........._Ve.v_......VY.,....._...,Y......._..._........._,_.,Y.I....._...,._......_.....__,_.... .....e,. F u lly on
Series Condenser Connect Signal Adfust Signal Turn Radio
Step; or Dummy Antenna Generator To Generator To Dial To Adjmt Trimmers
IZSA7 Grid (Pin #8) ,
1 0.1 Mfd. Ground Generator 456 KC Quiet Point A-B (Znd IF Trans)
to B- (not chassis) near H. F. end C-D (lst IF Trans)
3 .000Z00 Mfd. Ant. lead 1400 KC 1100 KC F (Ann)
(C)Jonn F. Rider

Page 4:

E 17-10 UNITED MOT RS
UNITED MOTORS SERVICE
111251, R125lA., R1232 DIV. OF GENERAL MOTORS CORP.
SERVICE PARTS LIST
Illus. Service _
No. Part No. Description
ELECTRICAL PARTS
COILS Y
1 1217593 Antenna Assembly - Loop and Baal: Cover
Z 1216518 Oscillator
Z2 1216980 Znd I. F. (Includes Illus. No. 7 and 28) Unshiclded - Mounted on under side
of chassis
22A 1217594 2nd I. F. (Includes Illus. No. 28) Shielded - Mounted on top of chassis
CONDENSERS
11 E204 .20 1)/lfd. 400V Tubular
IZ E502 .005 Mfd. 600V Tubular
13 G471 .000470 Mfd. Molded
14 E503 .05 Mfd. 600V Tubular
15 E503 .05 Mfd. 600V Tubular
16 E103 .01 Mfd. 600V Tubular
17 _]908 2 Section Electrolytic
18 1217391 Condenser and Pulley Parts Package
Condenser and Pulley
Grommet (3)
Screw (3)
25 E503 .05 Nlfd. 600V Tubular
26 E502 .005 I)/Ifd. 600V Tubular
RESISTORS
4 A224 220,000 Ohms % W Insulated
5 A151 150 Ohms % W Insulated
6 A685 6.8 Megohms % W Insulated
7 A335 3.3 Megohms % W Insulated
8 A223 22,000 Ohms % W Insulated
9 B102 1,000 Ohms 1 W Insulated
10 A474 470,000 Ohms % W Insulated
Z7 A224 220,000 Ohms Vg W Insulated
Z8 A473 47,000 Ohms % W Insulated (Used only on sets utilizing volume controls
without avstop.)
29 A330 33 Ohms % W Insulated
| TUBE COMPLEMENT
MISCELLANEOUS ELECTRICAL PARTS
24 1216477 Control - Volurhe and Switch
24A Volume Control
24B Switch
1216512 Cord ~ Universal Power
435433 Lamp _ Dial Light (Mazda #47)
I 3 1216563 Speaker - 5" P. M. (Bracket #1217406 is necessary when replacing original
23 1216571 Transformer - Output
(C)John F. Rider

Page 5:

' UNITED MOTOR PA E 1 -
' Power Consumption
"` MGTORS ERVICEW MODELS 111250, ruzsos,
DIV. OF GENERAL MOTORS CORP. 111251, R12s1.1, 111252
SERVICE PARTS LIST (Cont)
.. .__.._._..30 Watts sig;
Illus. Service
' No. Part No. Description
MECHANICAL PARTS
MISCELLANEOUS CHASSIS PARTS
1217406 Bracket - Speaker Mounting (For 5" Speakers)
1216559 Clip - Condenser
1212233 Cord - Universal Dial Drive
1217210 Dial and Dial Plate - Dial, Dial Plate and Bracket Assy. (Model R-1232)
1.217213 Dial and Dial Plate - Dial, Dial Plate and Bracket Assy.
1217421 Dial and Dial Plate - Dial; Dial Plate and Bracket Assy.
1216831 Pointer - Dial
20 1216479 Shaft - Tuning
1217366 Spacer (Use with Tuning Shaft)
1217323 Spring - Drive Cord Tension
19 1217819 Socket - Dial Light, Less Lamp
7236279 Socket - Octal Tube
1216508 Washer _ "C" (Use with Tuning Shaft)
MISCELLANEOUS CABINET PARTS
lZ167l5 Cabinet - Ivory - Models R-1230, R-1230A (Includes Crystal)
1216827 Cabinet - Walnut - Model R-1232 (Includes Crystal)
1216714 Cabinet - Brown - Models R-1231, R-1231A (Includes Crystal)
1216660 Crystal - Dial (Models R-1230, R-1230A, R-1231, R-1231A)
1216811 Crystal - Dial (Model R-1232)
1215825 Knob - Ivory - Volume and Tuning (Models R-1230, R-IZSOA)
1216826 Knob - Brown - Volume and Tuning (Models R-1231, R-123lA, R-1232)
speaker ._,._._ s" PM j ~'ss 371
Tuning _>>ff_ff>>>>ff, - ee-fe,e ~__>>>>ef,~>>-f_._-- M anual #1335 ii if Zi _`~~ 2
Timing Range ....e............ e..... s 40 to 1720 KC ig <= ,>>
I Intermediate Frequency ...,. _ _,f.e>>,fffeffff,ffffffff fffee 4 56 KC 31151. Q llei' gf'
Power Supply ....._ .............. eeeee... 1 0 5/125 volts AC-DC 1
Model R-1232-Walnut Wood Cabinet
Models R-1231 and R-1231A-Brown Plastic Cabinet
Models R-1230 and R-1230A-White or Ivory
The same chassis is used in all of tloe five different models
listed in this bulletin. Models R~1230A and R-1231A are -
equipped with a shielded
, is mounted on the upper side of the chassis whereas Models
MODELS R-1230, R-1231,
R-1230A and R-1231A
Plastic Cabinet
Second I. F. Transformer which
R-1230, R-1231 and R-1232 are equipped with an unshielded '
Second I. F. which is mounted on the under side of the
MODEL R-1232 '
(C)John F. Rider

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