GE/RCA Superadio 3 Manual

Re-typed in HTML format, remaining as faithful as possible to the original.

Thomson Consumer Electronics, Inc.
Audio and Communications
Basic Service Data 		7-2887A
Technical Publications
P O Box 1976/ Indianapolis Indiana 46206		 Technical Publications
6540 Tomken Road/ Mississuaga, Ont L5T 2E9

SERVICE DATA INDEX
    PAGE
NUMBER
Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Schematic Dragram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5


SAFETY NOTICE
Components having special safety characteristics are identified by stars (*) on schematics and on the parts list in this Service
Data and its bulletins. Before servicing this instrument, it is important that the service technician read and follow all applicable
"Safety Precautions" and "Product Safety Notices".

First Edition .. First Printing
Copyright 1992 .. Thomson Consumer Electronics, Inc.
Printed in USA .. Trademark(s) Registered .. Marca(s) Registrada(s) 		SM72887A


SAFTY CHECK

Perform the following safety cheek after servicing this unit.

  1. Remove all externally connected test equipment and wires
    before safety testing this unit.

  2. Use RT6440 Safety Test Box or construct circuit as shown.

  3. Plug power cord of unit to be testecl into Test Receptacle.

  4. Switch unit being tested to On position.
  1. Conncct VTVM across 1K resistor in test circuit. Set meter
    on high (150 V AC) scale to avoid meter damage and touch
    the following points with Test Probe.

    a) Power transformer frame
    b) Volume control frame

  2. Any reading greater than two tenth (.2) volts indicates a
    potential shock hazard If this occurs determine thc cause of
    the leakage, correct the problem, and repeat safety test.






ALIGNMENT PROCEDURE
ALIGNMENT PROCEDURE

AM ALIGNMENT - FUNCTION SWITCH IN AM POSITION

AM Generator - RF Radiated Signal Modulated 30% at 400 Hz
GENERATOR
FREQUENCY		 RADIO DIAL
SETTING		 INDICATOR ADJUST REMARKS
1. 455 kHz Low End
Output Meter

Across Speaker		 T4, T5, T6, T9 Adjust for maximum.
2. 1640 kHz High End C37 Adjust for maximum
3. 520 kHz Low End L5 Adjust for maximum. Repeat steps
2 and 3 for band ends.
4. 1420 kHz Tune to Signal C8, C30 Adjust for maximum
5. 600 kHz Tune to Signal T10, L6 Adjust to obtain maximum output.
Repeat steps 4 and 5 until no
further improvement is noted.

FM ALIGNMENT - FUNCTION SWITCH IN FM POSITION

High Side of FM Sweep Generator thru a 5pF capacitor in series with 68 Ohm resistor to TP1.
Use only enough Marker Signal for Indication.
GENERATOR
FREQUENCY		 RADIO DIAL
SETTING		 INDICATOR ADJUST REMARKS
1. 10.7 MHz Low End Scope at TP4 T1, T2, T3 Adjust for maximum gain and
symmetry. Repeat as necessary.
2. 10.7 MHz Low End Scope at TP5 T7, T8 Adjust for symmetrical S-Curve
using strong signal.
FM Generator - Modulated RF Radiated Signal
3. 109.0 MHz High End
Output Meter

Across Speaker		 C26 Adjust for maximum.
4. 87.2 MHz Low End L4 Spread or compress coil windings
slightly to raise or lower frequency.
Repeat Steps 3 and 4
5. 108.0 MHz Tune to Signal C13, C17 Adjust for maximum.
6. 88.1 MHz Tune to Signal L1, L2 Spread or compress coil windings
slightly to obtain optimum
alignment. Repeat Steps 5 and 6

NOTE: Scope used must have at least 50 mV/CM sensitivity and sweep generator at least 200mV output.

L7 ALIGNMENT
  1. Connect a frequency counter through a 150k ohm resistor to the cathode of D1.
  2. Adjust L7 for 3 MHZ to 3.5 MHz.

R1 ALIGNMENT
Set band switch to FM position and AFC switch to off.
  1. Connect a high impedance voltmeter to junction of R2 and C7.
  2. Adjust R1 for 9.4V to 9.6V.

AFC ALIGNMENT
Set radio frequency to 98MHz and AFC switch to off.
  1. Measure DC voltage at junction of C5 and S2.
  2. Connect voltmeter to junction of R45 and S2 and adjust R45 for same voltage measured at junction of C5 and S2.


REPLACEMENT PARTS

Ref. No.Cat. No.Description Ref. No.Cat. No.Description
CABINET AND CHASSIS
CA6098A20159CABINET, FRONT CA7643A20169KNOB
CA6198A20160CABINET, BACK CA8495A20170SPEAKER, 6-1/2"
CA639A20161DOOR, BATTERY CA8595A20171SPEAKER, 2"
CA6590A20162CRYSTAL, DIAL CA8688A20172*TRANSFORMER, POWER
CA6690A20163CRYSTAL, TOP CA90EA66X87*CORD, POWER
CA6778A20164HANDLE C1025-1992ANTENNA, WHIP
CA6989A20165GRILLE, SPEAKER CA1042A20173SPRING, BATTERY
CA7043A20166KNOB, TUNING CA105EA2X1893CONTACT, BATTERY
CA7243A20167KNOB CA1062A20174SPRING, CONICAL
CA7443A20168KNOB, POWER    
 
ELECTRICAL
C6631A19120*CAP LYTC 1000uF 16V Q9EA15X1061TRANSISTOR C732TM
D1EA16X503DIODE 1S1588 Q10EA16X1061TRANSISTOR C732TM
D2EA16X878DIODE 1N4148 Q11EA15X1061TRANSISTOR C732TM
D3EA16X878DIODE 1N4148 Q12EA15X1061TRANSISTOR C732TM
D4EA16X878DIODE 1N4148 Q13EA15X1061TRANSISTOR C732TM
D5EA16X941DIODE Q14EA15X681TRANSISTOR 2SC1923
D6EA16X854DIODE ZENER Q15EA15X681TRANSISTOR 2SC1923
D7EA57X14DIODE 1N4002 Q16 EA15X1061TRANSISTOR C732TM
D8EA57X14DIODE 1N4002 Q17EA15X1061TRANSISTOR C732TM
D9EA57X14DIODE 1N4002 R5349A20177RES CONTROL
D10EA57X14DIODE 1N4002 R5649A20177RES CONTROL
D11EA16X878DIODE 1N4148 R64EA49X881RES CONTROL
D12EA16X878DIODE 1N4148 S139A20178SWITCH
D13EA16X878DIODE 1N4148 S239A20178SWITCH
F1EA41X780FILTER CERAMIC FM S3EA39X1115SWITCH
J1EA41X844JACK PHONE STEREO S439A20178SWITCH
Q1EA15X7242TRANSISTOR U1EA33X9431IC AM/FM
Q215A20175TRANSISTOR VD116A20150DIODE VARACTOR
Q315A20176TRANSISTOR VD216A20150DIODE VARACTOR
Q4EA15X1422TRANSISTOR C380TM VD316A20150DIODE VARACTOR
Q515A20176TRANSISTOR VD416A20150DIODE VARACT0R
Q6EA15X4335TRANSISTOR VD516A20179DIODE VARACTOR
Q7EA15X4335TRANSISTOR VD616A20179DIODE VARACTOR
Q8EA15X1061TRANSISTOR CT732M  UC7887AUSE and CARE GUIDE
 
NOTE: "CA", "MS" and "TM" referenceses are for factory use
only.

Parts not listed or listed without catalog number are non-
stocked items.

Capacitors, resrstors and items not listed are non-stocked
items. All such items should be replaced with same type, size
and rating as original. 		Parts marked on the schematic and in the parts list with a "*" are
safety critical and must be replaced wrth factory replacement
parts in order to maintain the safety chamctenstics of the
Instrument.

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