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A good user manual
The rules should oblige the seller to give the purchaser an operating instrucion of Realistic DX-75, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.
What is an instruction?
The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Realistic DX-75 one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.
Unfortunately, only a few customers devote their time to read an instruction of Realistic DX-75. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.
What should a perfect user manual contain?
First and foremost, an user manual of Realistic DX-75 should contain:
- informations concerning technical data of Realistic DX-75
- name of the manufacturer and a year of construction of the Realistic DX-75 item
- rules of operation, control and maintenance of the Realistic DX-75 item
- safety signs and mark certificates which confirm compatibility with appropriate standards
Why don't we read the manuals?
Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Realistic DX-75 alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Realistic DX-75, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Realistic service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Realistic DX-75.
Why one should read the manuals?
It is mostly in the manuals where we will find the details concerning construction and possibility of the Realistic DX-75 item, and its use of respective accessory, as well as information concerning all the functions and facilities.
After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.
Table of contents for the manual
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Page 1
Ltstlc- COM MUN I C AT I ON REC E IV E R OPERATING AND SERVICE INSTRUCTIONS M(IDEL DX.I5 RADIO SHACK CORPORATION DIVISION OF TANDY COR,PORATION[...]
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Page 2
# INTRODUCTION The Realistic DX -75 Communications Receiver is desig'ned to I rvideboth the usual "long wave" standard broadcast recei)tion and'short wave' international broadcast recep- tion. Therefore, it allows the listener to span the oceans ald travel around the world by means of radio waves. of radio waves. Short wave[...]
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Page 3
SPECIF'ICATIONS 6-5/16 x 14-I/4 x Lt)-17/32 1 5 pounds 550 to 1600 KC - 1.6 to 30 MC 3.5prv at 20 MC (6 db signal-to- noisc ratio with 30/s mocl . ) 6 db dorvn, 14.5 KC; 60 db dorvn, I 25 KC I .5 warrs 105 to 125 volts, 60 cps 35 watts OPERATION VOLUME Ciockwise rotation of t]le Volurne control knob turns on powcl and increascs volume. BAND SE[...]
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Page 4
SET TUNING CAPACITOR FULLY CLOSEO SPRING HERE 3_LooP coRD 3_t/2 TURt{S AROUNO SHAFT LOOP CORD FAST E FASTE Fig. I Dial Stringing Diagram SET TUNING CAPACITOR FULLY CLOSEO G' MAIN TUNING DIAL CORD (REAR VIEIV) BAND SPREAD DIAL CORD ( REAR VIEIY) LooP coRD 2-t/2-'' TURNS AROUND SHAFT ,ffit[...]
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Page 5
s c3 2-25 c4 4-40 c5 4-40 c6 4-40 c7 220 ct5 .OO5Pf ALL RESISTOR VALUES ARE IN OHMS A I/2WATT UNLESS OTHERWISE SPECIFIED, ALL CAPACITOR VALUES ARE IN MICROMICROFARADS UNLESS OTHERWISE SPECIFIED. f3- ){ R2 t.5K : g.F.o. I c27 30 "/ sw .{ oN I {as I 470 = 4 B.F.O. VIB lz, eCuea clo t.o R3 roo R4 47K --- I I I 7 lc24 I reov i L-- R7 looK c22 L .o[...]
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Page 6
v2 I28A6 c38 rt .oo5l s V3 I2AV6 V4 6AQ5A I c26 I.otpt - R24 o, sw 3 IOOK .1 ST8Y. I REc. = Rll 2.2M cRl EO 3004 R23 4.7K Rt9 250 stv 4 8.F.O. CONT clD 40pl 350v crc lOpf 350V DX -75 T- I I l rC t28 +7ovj JI PHONE[...]
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Page 7
/ii- ey/ ,ri-3-l t'_J .t@ ,-.@ .o@ cs@ cq@ cs@ ceO L6@ L8@ 15@ cu@ crz@ u z (O gs@ qq@ o Fig. 2 Chassis Layout Diagram[...]
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Page 8
* A LIC;NMENT INSTITIJC'f IONS Equiptnr:nt rcquirccl : l. Oscilloscopc with calibratcd vcrtical scalc 2, RF Signal gcncrator- capablc of: a, Oprcratiol fronr 455 KC to 30 MC b. Attenuation below lpv output c. Modulation at I KC wich variablc modula- tron pcrccnt.rges IF Alignnrent 1. Looscly couplc a 455 KC, 50/u modulatcct signal into thc ant[...]
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Page 9
PARTS LIST I'TEM NO. DESCRIPTION PART NO. ITEM NO. DESCRIPTION PART NO. VI v2 V3 V4 TUI]ES 6CL8A 128A6 I2AV6 6AQsA CAPACITORS 40 -20 -10 -4Oprfl350V -350V -350V -150V Electrclytic .0lpf GMV Z5U 500V Cerarnic 2-2Spf Ceramic Trirnmer 4 -40pf Ceramic Trimmer 4-40pf Ceramic Trimmer 4-40pf Ceramic Trimmer 22Opt tl/o NPO 500V Ceramic -? I t- 2) c33[...]
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Page 10
PARTS LIST (CON'T.) ITEM NO. DESCRIPTION PART NO. ITEM NO. DESCRIPTION PART NO. TI lz .r? T4 TRANSFORMERS Power Traasformer Outprt Transformer IF 455KC IF 455KC COILS RF Band #l RF Band #2 RF Band #3 RF Band #4 Osc, Band #l Osc. Band #2 Osc. Band #3 Osc. Band #4 SWITCHES Power Switch (On Volume Control) ANL (On - Off) STBY-REC BFO Switch (On B[...]