Sony MDS S9 – Circuit diagram – Minidisc Deck

MD mechanism type: MDM-7A

Optical pick-up name: KMS-260B

Display Board

BD Board

Main Board

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Teledex 21NF55 – Teledex 21PF93 – How to enter service mode – Schematic diagram – CRT Television

DESIGN/SERVICE mode
To enter the USER SERVICE mode
Caution: The user service mode adjustment can be changed only when service personnel adjust the whole set data during servicing. As the control data have dramatic effects on functions and
performance of the TV, service personnel should not tell user how to enter the SERVICE mode to avoid improper data settings.
Set the volume to 0. Then press and hold the MUTE button on the remote control, and press the MENU button on the TV to enter the SERVICE mode. (In this case, the S mode cannot be stored in the EEPROM. To exit from the S mode, turn off the TV set.)
After entering the S mode, Red“ S”is displayed on the upper center of the screen and MENU1 is default. Use the POS+/- buttons to highlight an adjustment and the VOL+/- buttons to adjust
it. The adjusted data are immediately output and stored in the EEPROM.
EX-1A1 chassis series are applied in 21NF55/21PF93 respectively which uses mainly Philips’ advanced UOC-ultimate chip TDA935X/6X/8X and I2C-bus controlled IC. With combination of
microcontroller and small signal processor, the TDA935X/6X/8X series feature high-integration, high-performance-to-price ratio and high-reliability and advanced functions with fewer external
components, which provide much convenience for manufacturing and technical service.
The super chips TDA935X/6X/8X are good in pins compatibility. Differences among them are shown as follows.
TDA9351（48K） PAL/NTSC/SECAM+1 PAGE TELETEST
TDA9350（48K） PAL/NTSC+1 PAGE TELETEST
TDA9361（64K） PAL/NTSC/SECAM+10 PAGE TELETEST
TDA9360（64K） PAL/NTSC+10 PAGE TELETEST
TDA9380（32K） PAL/NTSC
TDA9387（32K） NTSC

Circuit diagram & PWB

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RCA 24V12T – RCA 27V412T – RCA 32V432T – CRT TV schematic

RCA 24", 27" and 32" CRT TVs - circuit diagram (full)

Might take some time to load with slow internet connection speed

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Insignia NS-LCD32-09 32″LCD TV power, SMPS and LVDS circuit diagram

32 inch LCD TV - Insignia - Horizontal Frequency 31~60 kHz. SMPS, Audio amplifier, Audio processor, Audio output and LVDS schematic

LVDS

SMPS

Power

Audio output

Philips AL695 – FM-AM radio – Schematic

AM-FM Radio – Philips – Circuit diagram – Wiring diagram

Circuit diagram and PWB

Samsung LN23R51B - LN26R51B TFT-LCD TV - MONITOR – SMPS circuit diagram.

Samsung TFT-LCD TV/MONITOR – SMPS Schematic.  LN23R51B - LN26R51B - LN32R51B - LNR268WH - LNR328WH - LN32R51BH: ROME PJT 23 inch

 

Behringer B2031 Schematic - Active 2 way reference studio monitor speakers

  As is always the case with a two-way active monitor, each B2031 is equipped with two separate power amplifiers – one for the low frequency driver and one for the tweeter (150 watts and 75 watts respectively).  The low frequency polycarbonate driver is 22cm in diameter and the high frequency duties are handled by a one-inch ferofluid-cooled titanium dome tweeter. The crossover circuitry consists of an active fourth-order Linkwitz-Riley filter kicking in at 2kHz. The enclosure also employs a bass reflex porting system to extend the low frequency drivers’ overall frequency response down to a quoted 50Hz.  Other features of the B2031s worthy of note include: protection circuitry to look after the drivers and amplifiers in the event of overload; and electromagnetic shielding to allow close placement of the B2031’s to TV screens and computer monitors without interference.

At the back of the B2031s you’ll find a metal amplifier housing which extends about an inch or so beyond the dimensions of the speaker enclosure itself (H:W:D 400 x 250 x 290mm). The balanced XLR, balanced/unbalanced TRS and 240 volt IEC power cord all connect vertically upwards into the amplifier housing, leaving the back of the B2031s free of plugs jutting out at right angles. This arrangement makes it much easier to place these monitors close to rear walls – not the best placement, admittedly, but sometimes necessary.  The rear panel of the B2031 is also where you’ll find a number of active controls. These include: Input Trim – which adjusts the B2031’s input sensitivity to the signal source; Low Frequency cut – for adapting the B2031s to an additional subwoofer system; Room Compensation – which rolls off bottom-end relative to wall/corner placement (0, - 2, -4, -6dB); and High Frequency – which compensates for the amount of high frequency damping in the monitor environment (0, +2, -2, -4dB). High and low driver mute switches are also included, which the manual suggests are for maintenance and servicing only – although  found them quite useful while setting up, as they allowed  to get a feel for the individual speaker components.  First impressions of the B2031’s were clearly centered on their extended bottom-end and the impressive definition and detail in their stereo imaging. After much listening, and a bit of tweaking of the rear-panel settings, the B2031s did a creditable job of matching themselves to my particular monitoring environment – particularly in their ability to modify the bottom end in order to compensate for their less-than-ideal close-proximity to walls and corners.

Schematic (Circuit diagram)

A first mix on the B2031s – played back on a number of passive monitors I usually use – revealed a few home truths about the differences in working with passive and active monitor designs. Although the essential balance of the mix held up impressively when played back on the passives, overall it sounded a bit lifeless. All that wonderful detail and definition that oozes out of the B2031s gets lost among the inherent limitations of your typical near field passive monitors. In essence, you still need to ‘work the mix’ on the B2031s – sweetening it up, adding punch and color as the music requires – so as to get the mix to translate effectively into the all-pervasive passive world.  From the first time I heard active reference monitors I was a convert – particularly since I had the advantage of comparing a set of active monitors right alongside a passive version from the same manufacturer. The passive pair contained identical speaker components to the active monitors and were being powered by an amplifier of quite reputable design. The difference was such that it didn’t take an audiophile to pick which monitors had more detail and definition.

The Behringer TRUTH B2031s follow in this grand tradition of the active monitor. They certainly grabbed my attention from first listen and continued to impress after countless listening sessions and mixes. At their current price-point the B2031s will certainly keep the competition honest – as well as leaving many similarly priced passive speaker/external amplifier combinations sounding somewhat lifeless.