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A good user manual
The rules should oblige the seller to give the purchaser an operating instrucion of NAD 7140, 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 NAD 7140 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 NAD 7140. 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 NAD 7140 should contain:
- informations concerning technical data of NAD 7140
- name of the manufacturer and a year of construction of the NAD 7140 item
- rules of operation, control and maintenance of the NAD 7140 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 NAD 7140 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 NAD 7140, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the NAD 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 NAD 7140.
Why one should read the manuals?
It is mostly in the manuals where we will find the details concerning construction and possibility of the NAD 7140 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
7140 S t e r e o Re c e i v e r Date of manufacture : Jan 87 - Nov 89 Please note that this document contains the text from the original product brochure, and some technical statements may now be out of date NAD is internationally recognised as the value leader in Hi-Fi, and the new 7140 stereo receiver provides an exceptional ratio of performance [...]
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Page 2
High-curr ent output stage Electrical power is the product of voltage and cur r ent, but cur r ent flowing through the voice coil is what makes a loudspeaker cone vibrate and reproduce sound. In many amplifiers the out-put cur r ent is deliberately constricted by cur r ent limiters (protection circuits), in order to allow the use of smaller , cheap[...]
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Page 3
PRE-AMP SECTION Phono input Input impedance (R and C) 47k Ω / 100pF Input sensitivity , (1kHz, ref. rated power) 3.2mV Signal/Noise ratio (A-weighted with cartridge connected) 76dB ref. 5mV THD (20Hz - 20kHz) <0.04% RIAA response accuracy (20Hz - 20kHz) ±0.5dB Line level inputs Input impedance (R and C) 15k Ω / 100pF Input sensitivity (ref.[...]
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Page 4
FM TUNER SECTION Input sensitivity Mono -30dB THD+N 10.3dBf (1.8µV/300 Ω ) Mono 30dB S/N 14.2dBf (2.8µV/300 Ω ) Stereo 50dB S/N 36dBf (34µV/300 Ω ) FM NR of f 29dBf (16µV/300 Ω ) FM NR on Stereo 60dB S/N 46dBf (110µV/300 Ω ) FM NR of f 40dBf (56µV/300 Ω ) FM NR on Capture ratio (45 - 65dBf) <1.5dB AM rejection (45 - 65dBf) >[...]