Realistic sta 2100 d service manual

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STA-21 00D

AM/FIM STEREO RECEIVER
Catalog Number : 31-2090

RADIO SHACK EA DIVISION OF TANDY CORPORATION

U.S.A.: FORT WORTH, TEXAS 76102
CANADA: BARRIE, ONTARIO L4M 4W5 L

TANDY CORPORATION

AUSTRALIA BELGIUM U, K

2807316 VICTORIA ROAD PARC INDUSTRIEI OE NANINNE BILSTON ROADWEDNESBURY r
RYDALMERE, N S W ZIIS 5I4O NANINNE WEST MIDLANDS WSIO 7JN

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CUSTOM MANUFACTURED FOR RADIO SHACKEA DIVISION OF TANDY CORPORATION

9A9 Printed in Japan

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L:::::I CONTENTS 3

. Page

1) ELECTRICAL PERFORMANCE SPECIFICATIONS .................... 3 .. 5

2) DISASSEMBLY INSTRUCTIONS ................................... 6 - 7

3) BLOCK DIAGRAM ....................................................... 8

4) DIAL STRINGING DIAGRAM .............................................. 9

5) LEVEL DIAGRAM ........................................................ 9

6) OPERATION CHECK FOR CIRCUITS .......................... 10 - 20

7) ALIGNMENT INSTRUCTIONS ....................................... 21 _ 26

8) BRIEF DESCRIPTION OF PROTECTOR CIRCUITS ...................... 27 ~ 29

9) DOLBY FM ....................................................... 29 ~ 30

10) TROUBLESHOOTING ............................................. 31 - 36
11) IC 8. TRANSISTOR LEAD IDENTIFICATION ................................ 37
12) FRONT END PCB. (TOP 8 BOTTOM VIEWS) .............................. 38
13) PRE AMP WITH SELECTOR SWITCH PCB. (TOP 8 BOTTOM VIEWS) ....... 39
14) TONE AMP, MUTING, TAPE SWITCH PCB. (TOP & BOTTOM VIEWS) .. 40 - 41
15) MAIN AMP PCB. (LEFT) (TOP 8. BOTTOM VIEWS) .................. 42
16) MAIN AMP PCB. (RIGHT) (TOP 8. BOTTOM VIEWS) .................. 43
17) IF 8. DOLBY PCB. (TOP 8 BOTTOM VIEWS) ............. 44 -. 45
18) PROTECTOR 8 METER PCB. (TOP & BOTTOM VIEWS) .................. 46
19) POWER SUPPLY PCB. (TOP 3 BOTTOM VIEWS) .................. 47
20) SPEAKER SWITCH PCB. (TOP 8- BOTTOM VIEW VIEWS) ............. 48
21) MODE SWITCH PCB. (TOP 8- BOTTOM VIEWS) .................. 48
22) MAIN SUB PCB. (LEFT & RIGHT) (TOP 8 BOTTOM VIEWS) ................ 49
23) RELAY PCB. (UL models only) (TOP 8. BOTTOM VIEWS) .................. 49
24) PHONO LEVEL PCB. (TOP &. BOTTOM VIEWS) .................. 49
25) SELECTOR INDICATOR PCB. (TOP VIEW) ................................ 49
26) LED WITH POWER SWITCH PCB. (TOP VIEW) ............................ 49
27) ELECTRICAL PARTS LIST ..................................... . ..... 50 - 57
28) EXPLODED VIEW PARTS LIST ...................................... 58 - 60
29) MISCELLANEOUS PARTS LIST .......................................... 61
30) IC INTERNAL DIAGRAM ........................................... 62 ~ 65
31) SCHEMATIC DIAGRAM .................................. SEPARATE SHEET

32) EXPLODED VIEW ........................................ SEPARATE SHEET

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1) ELECTRICAL PERFORMANCE SPECIFICATIONS

AM SECTION

Notes: 1. Output readings are taken across a non-reactive 47K load termination.
2. Output is measured at TAPE OUT terminals.
3. The Generator output shall terminate in an IRE loop antenna.
4. Standard modulation: 400 Hz, 30% modulation.
UNIT NOMINAL LIMIT

Frequency Coverage (kHz) 515- 1650 520- 1620
IF (kHz) 455 ~
Antenna Sensitivity for S/N 20 dB

at 600 kHz, 1000 kHz and 1400 kHz ( pV/m) 200 400
Terminal Sensitivity ( ,uVI 10 -
S;N Ratio at 5 mV/m Input . (dB) 45 40
ACA at S/N 20 dB Input, 1000 kHz (dB) 40 28
AGC Distortion at 100 mV/m Input, 80% modulation (%) 1.5 40
IF Rejection Ratio at 600 kHz (dB) 56 48
Image Rejection Ratio at 1400 kHz (dB) 60 52
Bandwidth at 6 dB down, 1000 kHz (kHz) 6.0 4.5~8.0
Distortion at 5 mV/m Input 1%) 1.0 3.0
Tape Out Level at 5 mV/m Input (mV) 200 200:3 dB
Audio Fidelity at 5 mV/m Input

(1 kHz = 0 d8) -6dB Point (Hz) 50-3K 70-~2.5K
Whistle Modulation of 2nd and 3rd Harmonic

at 1 mV, 5 mV and 100 mV (%l 3.0 10.0
Dial CaIibration at 600 kHz (kHz) 0 :25
at 1400 kHz ' (kHz) 0 :50

Spurious Response at 1000 kHz refered to

20 dB S/N Input (dB) 50 45
AGC Figure of Merit at 1000 kHz (dB) 48 40

The oscillator shall not drift more than 10 kHz starting at 25°C and through a temperature range
up to 50° C.

The Set shall opeate in satisfactory manner through a temperature range from OC through plus
45°C.

FM SECTION

Notes: 1. Output readings are taken across a non-reactive 47 K load termination.
2. Output is measured at TAPE OUT terminals.
3. The signal voltage in this specification is the voltage appearing across the tuner input
terminals (IHF).
4. Standard modulation: 1000 Hz, 75 kHz deviation.
UNIT NOMINAL LIMIT

Frequency Coverage (MHZ) 86.5~ 108.5 88-108
IF (MHZ) 10.7 ..
IHF Sensitivity at 90, 98 and 106 MHz 1 #V) 1.6 2.5
ldBf) 9.3 13.2
S/N 50 dB Quieting Sensitivity ( uV) 3.0 4.5
(dBf) 14.7 18.3
-3 dB Limiting Sensitivity l uV) 1.5 20
IF Rejection Ratio at 90 MHz ((18) 95 80
Image Rejection Ratio at 106 MHz (dB) 80 70
Spurious Response at 98 MHz (dB) 90 75
Capture Ratio (d8) 15 2.5
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