grundig: Grundig Yacht-Boy 230: Design choices
Grundig: grundig yacht-boy 230: design choices .
Despite being an analog receiver design, the management is done by a Sanyo LC5850 -738 CMOS Single Chip 4-bit Micro-Computer with LCD Driver ( IC101 on the PCB), that also supports the Clock, Alarm, Wolrd Map Time Zones, and Sleep functions.
The LC5850-738 receiver management functions are:
- RF Band selection with the help of a 74HC154 4-16 line decoder ( IC5 ) whose output lines enables one of the 16 RF bands available in this radio model.
- Power ON/OFF control. This receiver design do not offer regulated power supply to the Management Processor, therefore the CR2016 3V is the single power source for both Clock and Receiver functions.
- Light control. Neither the Dial Scale nor the LCD feature ilummination, although the offered Light function allows to clearly see the clock time area with a nice green color thanks to the included single green LED ( D101 ).
- Show Tuning and Stereo indicators on the LCD, by reading these signals from the Toshiba TA8122AN AM/FM Tuner IC.
The RF front-end uses discrete active buffer/amplifier devices together with pairs of tuned circuits, one transformer for RF tuning and the other for local oscillator, resulting in the use of a large number of RF transformers and switching devices for RF band selection. This is a good design choice imho.
The filtered RF signal is passed to the Toshiba TA8122AN AM/FM Tuner IC ( IC1 ) that handles the RF amplification, local oscillators and mixers, as well as signal decoding with FM Stereo.
The dual channel audio signal is shaped for Tone Control, actively buffered and then passed to a Sanyo LC7534M Electronic Volume Control ( IC3 ). A Toshiba TA7376P dual channel Audio Power Amplifier ( IC2 ) will drive the stereo earphones while the internal 16 Ohm speaker appears to be connected in bridged mode.
The source of power supply (4.5VDC dry cells, or external adapter) is then used by:
- The IC3 thrugh a transistor switch ( Q10 )
- The LCD Clock zone green LED thrugh a transistor switch ( Q17 )
- The Sanyo LA5003M 3V LDO power regulator ( IC4 ) thrugh a transistor switch ( Q19 ).
- The transistor switches are controlled by IC101
- A smart protection circuit, built around a PNP power transistor Q18 is inserted when using a external power adapter.
- The regulated 3VDC from IC4 powers all the remaining devices, where some of them uses a 2.3VDC power source obtained by inserting a series diode ( D34 ) at the output of IC4.
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Grundig Yacht Boy 230 service manual
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Grundig Yacht Boy 230 Service Manual
This is the 13 pages manual for Grundig Yacht Boy 230 Service Manual. Read or download the pdf for free. If you want to contribute, please mail your pdfs to [email protected] .
Extracted text from Grundig Yacht Boy 230 Service Manual (Ocr-read)
G RU n DIG SERVICE MANUAL
Yacht Boy 230 Yacht Boy 230 Italia
Bel Eingriflen Schuumalinahmen iUr MOS-Bauleile beachlen!
N.B. When carrying out repairs, observe MOS placaulions!
Das Gerét muB auch nach dei Reparatui den Sicherheitsbesttmmuni gen nach DIN/IEC 65 VDE 0560 emsprechen,
lnhaltsverzaichnis Seite Ausbauhinweise 2-3 Ersatzteiliiste dis Sichemeitsvorsohritten 6-9 Behandlung von Chip ; Bauieilen 9-10 Abgleich 1 L14 Druckplatten 15-20 Schaltbild 21722 Blockschaitbild 2324
After the unit has been repaired, ii should still meet the DIN/\EC 65 VDE 0860 saiely requirements
Contents Page Disassembly instructions 2-3 Spare Parts List 475 Safety requitements 6-9 Handling of Chip Components 9-10 Alignment 1144 Printed Circuit Boards 1520 Connection Diagram 2122
Block Diagram 23-24
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Grundig Yacht-Boy-230 Service Manual
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