PIONEER PD-91 REFERENCE COMPCT DISC PLAYER (1988)

this is the pride and joy of my audio source component collection. one of the best, and arguably the very best CD player that PIONEER, or any other manufacturer ever made. a twenty-five pound, beautiful sounding tank of a CDP...









-SELECTED INSTRUCTION MANUAL SCANS-


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i aquired this 1988 TOTL $2000.00 CDP from a fellow in california for $25.00 with remote and manual in non-functional condition. many of PIONEER's late 80's CDPs, both single disc and six-disc magazine types, low end and high alike, suffered an issue with substandard adhesive holding the laser pick-up's lens in place. the adhesive would fail after a few years, and the lens would either fly off during the pick-up's slewing actions, or fall off, in the case of the upside-down mounted magazine models' pick-ups. this is what my PD-91 suffered. strangely, the lens was no where to be found in the chassis. i went ahead and robbed a lens off a dead KENWOOD portable i found at a yard sale years back, and fitted it in place. it fit like hand and glove!! TRACE dots of LOCTITE super glue around the circumference held it fast with no fogging afteraffects. it wouldn't work. a friend suggested twiddling the series of seven VRs on the pick-up control board directly aft of the transport assembly. i did so, and aft er 30 minutes of semi-organized experementation, i had the deck playing factory CDs!! another 30 minutes/less of fine tuning, and it was playing CD-Rs without a hitch!! it serves me well to this day. i am so very proud of this CDP. my very favorite CD player, restored to full function by my own hand!

This post has been edited by MacGyver on December 06, 2008 09:32 pm

more on this baby at The Vintage Knob:


http://www.thevintageknob.org/PIONEER/PD91/PD91.html

This post has been edited by MacGyver on December 06, 2008 11:14 pm

Very nice player. Does it feature the stable platter platform? That platform was used in EAD and Theta cdps as well- borrowed right from Pioneer. The other innovative platform from pioneer is a type of air-lock platform, used on models post the period of the stable platter darlings.

I own a Pioneer Elite PD-65 and find it a great player, including it's interesting Legato Link sound processing.

no, it does not use the stable platter design of the 1990s. it is a conventionally oriented tray loader, as you can see. i prefer it that way; this baby has beautiful looks and sound that i'm totally satisfied with, and is the only TOTL REFERENCE PIONEER CDP ever made with the traditional 1980's CDP look, which is one of the defining aspects of a classic CDP, IMO. i do not personally care for the mid-mount design of the ninties that dominated everything, from CDPs to VCRs. mid mount or no, this CDP is one of the most formidable CDP designs ever conceived, with an elaborate clamping-stabilzation mechanism and a magnetic linear rail pick-up transport mechanism that endows the player the ability to read, synchronize, play and slew between tracks virtually any CD/CD-R that enters it within a mean average access time of 0.5 seconds/less!! let me reiterate that there is NO MECHANICAL DRIVE in the linear transport! the pick up moves along it's travel via ELECTROMAGNETIC REACTION that is totally silent, and FAR faster than any mechanical drive!!!! bless PIONEER's heart; they stuck with this deck's pick-up assembly for all their TOTL CDPs from the 1987 debut of this model, straight to whatever TOTL CDP they're marketing in japan at present, the pick-up being STILL IN PRODUCTION and currently AVAILABLE from PIONEER's U.S. parts service!!!! despite this CDP's seeming complexity, it is quite literally the easiest thing to service!! PIONEER will forever retain my utmost respect for producing such an elegant design, crafted to last the decades, and also as they're just about the only mainstream japanese consumer electronics company left that still so openly supports the vast history of fine products they have produced. therefore, IMO, TOTL PIONEER CDPs, most especially this PD-91, have everything going for them to make them the most desirable vintage high-end Compact Disc Players in existence. no wonder this CDP is so hard to come by! only the most persnickety golden ears, that desire the absolute bleeding edge in CDP sound ever let examples of this CDP go! and i cannot imagine why, either. an all CLASS-A output stage provides a warm tonal character that's far preferable, IMO, to the more accurate, but rather shrill tonal character of the current state of the art. i guess i'm not so much of a true audiophile, as i prefer romantic epiphany over clinical accuracy...

This post has been edited by MacGyver on December 07, 2008 09:45 am

Tanx for sharing this audio classic gem.
The copper chassis is just awesome.

Nice looking PD-91. Been looking for one to complete my set.

here's an excellent example of just how stratospherically far above the PD-91 is to every other CDP PIONEER made at the time. this is the PD-7100, the TOTL standard line model from the same production year as the PD-91:








truly, as nice as it is, it is clearly a total POS from the inside when compared directly to the PD-91. irrefutable proof that the 91 stands on it's own in the long history of PIONEER ELECTRONIC CORPORATION's fine products...

This post has been edited by MacGyver on December 24, 2008 10:18 am

some comparison shots of of the JPN market version, the PD-3000:









the primary differences consist of a solid aluminum top plate in lieu of the PIONEER standard, ribbed sheet metal bonnet, a very different main board design, two independent outboard power transformers, one for ANALOG, one for DIGITAL, in lieu of the single large outboard transformer of the PD-91, a chrome ringed isolator supporting the solid aluminum transformer cradle rather than the smaller, solid black one, a much thicker power cable, and finally, a blue shaded FL display rather than the PIONEER U.S. standard amber shading. why did PIONEER choose to do this? my only logical guess is that they sold the U.S. PD-91 version here for less than what they MSRPed the JPN PD-3000 version for, probably to supposedly enhance it's competitiveness in the more competitive (at the time, anyway) U.S. market. though it seems to me that such a obviously superlative compact disc player would have sold just as well to the well-heeled american audiophile with those extra niceties and their attendant price increase retained. after all, it seems to me that PIONEER, at the time, at least, had massive market-share, second only to SONY. well, i suppose PIONEER's U.S. divisions' bean counters always have been a little on the nutty side...

This post has been edited by MacGyver on February 11, 2009 07:58 am

****02/17/2009****


i've got a bead on a mint PD-3000 with a faulty pick-up. there is a very good chance that i'll be getting it to replace the fully functional, but cosmetically worn PD-91 i currently own. this will be the ultimate, perfect version of my very favorite CDP!! if it's laser problem is a loose lens, i'll simply put a new lens on it, like i did with the 91. if i am unable to do that, then i'll just pull the transport assembly from my 91 and place it in the 3000, yeilding an instantly fully-functional player! this will also allow me to use the extra set of large PIONEER isolation feet gleaned from the 91 for my 1988 PIONEER GR-777 graphic EQ! my system is looking to turn out far better than i ever dared dream!!

This post has been edited by MacGyver on February 17, 2009 10:32 am

Shrewd businessman, you are!

ＰＩＯＮＥＥＲ　ＰＤ-３０００ PIONEER PD-3000
ＣＯＭＰＡＣＴ　ＤＩＳＣ　ＰＬＡＹＥＲ　￥１８０，０００ COMPACT DISC PLAYER ¥ 180,000

パイオニアが１９８７年に発売したＣＤプレーヤー。 The Pioneer CD player, released in 1987. 当時のパイオニアのＣＤプレーヤーの最高級機で，漆黒うるし調 At the time of the pioneers of the finest CD player in the machine, and that dark tone
の仕上げが美しい「ＥＸシリーズ」（他にＬＤプレーヤーやセパレートアンプ，ＤＡＴなどもあった）の一つで，優美な外 The beautiful finish of the "EX Series" (In addition to a separate amplifier and LD players, DAT and was) one of the outside and elegant
観の中に物量をしっかり投入して作り上げられていました。 Was created by investing in a good amount of sense.

Ｄ／Ａコンバーター部には１８ビット４倍オーバーサンプリングデジタルフィルターが採用され，ゆるやかな特性を持 D / A converter is 18 bits in the four times OBASANPURINGUDEJITARUFIRUTA is used, to have the characteristics of loose
つ低次のディスクリート構成アナログローパスフィルターで高次のサンプリングノイズを取り除くことで，位相特性， By removing the noise in the sampling of higher-order discrete low ANAROGUROPASUFIRUTA configuration, the phase characteristics,
歪率の向上を図っていました。 Was to improve the rate of strain. Ｄ／Ａコンバーターは，量子化レベルを１８ビットに引き上げた１８ビットＤ／Ａコンバー D / A converters, the quantization level raised to 18-bit 18-bit D / A Comber
ターをＬ／Ｒ独立で搭載した１８ビットツインＤ／Ａコンバーターを搭載していました。 The parameter L / R in a separate 18-bit twin D / A converter was equipped with.

ディスクのピット信号を読みとるックアップ部には，ＬＤプレーヤーで培った技術が生かされていました。 Read the signals in the pit of the backup disk, LD technology expertise was utilized in the player. 新開発の高精度ピックアップを搭載し，従来採用されていたコリメータレンズを必要とせず，高倍率の有限対物レンズを採用 す<br> ることで光路長に余裕ができ，安定した光路を実現していました。 Features a newly developed high-precision pick-up, without the need for conventional KORIMETARENZU was adopted, adopted a high-magnification lens <br> and limited space in the optical path length, the optical path to achieve a stable was. ハーフミラーも従来より厚いものを用い，入射角 Thicker than those used in conventional half mirror, the angle of incidence
度も大きく設定することで，外力に対する歪みを最小に抑え，光路に発生する有害収差を低減し光信号のクオリティ The greater the degree of setting, minimizing the distortion to the external force, and reduce the quality of the optical signal in optical path aberration caused harmful
を高めていました。 Was high. フォトディテクタにも最新のＩＣ技術を投入し，バッファアンプも同一ＩＣ内に集積し，外乱に対して安 The latest technology to introduce IC FOTODITEKUTA, identical to IC buffer amplifier integrated in the weak against the disturbance
定した信号系を実現していました。 System was to achieve a constant signal.
また，ピックアップ部には，高級ＬＤプレーヤーＬＤ-Ｓ１で開発された「アキュフォーカスシステム」を採用し，読み取り Also, in the pickup, luxury LD LD-S1 player was developed by "AKYUFOKASUSHISUTEMU" used to read
エラーを大幅に低減していました。 Would significantly reduce the error. これは，レーザーの光信号を電気信号に変換し演算処理するＲＦ回路を改善する This is a process that converts an electrical signal of the laser light to improve the RF circuit
技術で，フォカースサーボのために４分割されたフォトディテクタの構造上，レーザー光がピットの進行方向に沿って Technology for structural FOTODITEKUTA FOKASUSABO 4 was split along the direction of the laser pit
フォトディテクタを横切るように動く際発生する，先行の信号と後行の信号の間の時間的ズれによる高域の位相ズレ That occur when moving across the FOTODITEKUTA, gap phase of high-ZURE time between the signal and the signal line after the preceding
を改善するために，先行の信号を遅延させ，後行の信号と位相を合わせるシステムでした。 To improve, leading to delay the signal, the system could adjust the phase of the signal line. これにより，読み取りエ This read-d
ラーの少ない高出力のＲＦ信号が得られるようになっていました。 RF high-power low-error was to get the signal.

大容量トランスなど，電源部の強化も行われていました。 Transformers and large, had been strengthened in the power section. サーボ，デジタル系電源とオーディオ系電源をトランスその Servo, the transformer power supply and digital audio system
ものから完全に分離したツインパワートランスを搭載していました。 TSUINPAWATORANSU was equipped with a completely isolated. 電源プラグ根本からサーボ回路，オーディオ回路 Power plug from the bottom servo circuit, audio circuit
専用に芯線を分離したＯＦＣ極太４芯電源コードを採用し，相互干渉を徹底して抑えていました。 OFC core to a separate dedicated power cord employs a thick 4-core, was to ensure less interference. さらに，オーディオト In addition, ODIOTO
ランスは，ＯＦＣバイファイラ巻と振動を抑える珪砂封入樹脂含浸を採用した高音質トランスとしていました。 Lance, OFC was used as a transformer of high quality silica sand filled resin-impregnated BAIFAIRA Volume and vibration control.
オーディオ回路用に，定電流ダイオード等の高精度部品を採用したディスクリートプッシュプル構成の電源回路を配 For audio circuits, power distribution circuit configuration employing DISUKURITOPUSSHUPURU precision parts such as constant-current diode
置し，供給電源の安定化を図っていました。 The position was an attempt to stabilize the power supply. さらに，負荷端の電圧の変化を検知してフィードバックし電圧を制御する In addition, to control the feedback voltage to detect voltage changes in the load end
リモートセンシング方式を採用し，電源回路から負荷端までのインピーダンスの影響を低減していました。 Remote sensing method was to reduce the effects of load impedance to the edge of the power circuit.

オーディオ回路の基板は，１４０mm×３００mmの大面積のものを使用し，余裕あるパーツレイアウトを施し，かつ両面 The audio circuit board, 140mm × 300mm and use a large area, giving a margin PATSUREIAUTO, and both
基板とすることで，サーボ回路と完全分離の構成として，相互干渉を排除していました。 The board, composed of a servo circuit and the complete separation would eliminate the interference. オーディオ信号系のＤ／Ａコン Of the audio signal D / A Con
バーター以降のアナログ回路には，すべてＡクラスＦＥＴバッファアンプを採用し，電源の負荷変動及び各回路相互の Since analog circuits barter, all Class A FET buffer amplifier used, and each circuit between the power load
干渉，全段，後段のアンプの負荷に影響されない安定した波形伝送を実現していました。 Interference, the banner was intended to achieve a stable transmission does not affect the waveform of the load amplifier stage.

PD-3000 internal

デジタル信号回路内の複数のクロックの干渉によるビートノイズの発生を抑えるために，Ｄ／Ａコンバーター，デジタル In order to suppress the beat noise caused by interference of multiple clock signals in digital circuits, D / A converters, digital
フィルター，デコーダーからシステムコントロールマイコンまでクロックを同期させた「ＮＥＷクォーツマスタークロック」を Filter, a microcomputer control system to synchronize the decoder clock "NEW KUOTSUMASUTAKUROKKU"
採用していました。 Was adopted. また，デジタル信号処理回路からのノイズの他への混入を避けるために，使用していない回路の In order to avoid the incorporation of noise from the digital signal processing circuit, the circuit does not use
動作を停止するデジタル／アナログアウト切換スイッチを装備していました。 Digital stop working / were equipped with analog switch Logout. ヘッドホン回路もジャックに差すと初めて And put the headphone jack on the circuit
回路が動作する方式とし，ＦＬ表示点灯ノイズを抑える，ＦＬ表示消灯スイッチも付けられていました。 Method and circuit, FL display lights control the noise, FL was also an off switch.

ＰＤ-３０００では，不要振動を排除する無共振・無振動化が徹底して行われていました。 PD-3000, was made to ensure the non-resonant vibration-free and eliminate unwanted vibration. ピックアップを支えるメカベー Supporting MEKABE Pickup
スを２重構造とし，ピックアップ側のベースに銅メッキを施して，さらにこれを特殊樹脂でモールディングして振動減衰 The device structure with two, giving the copper plating on the pickups, vibration damping and the special resin molding in addition
特性と磁気歪みの改善を図っていました。 Was an attempt to improve the distortion and magnetic properties. 一番の振動発生源である電源トランスは，プレーヤー外部に独立したトラ Power transformer is the best source of vibration, an external independent tigers players
ンスベースを設定し，極厚アルミアングルと真鍮無垢のインシュレーターを採用して，トランスブロックをフローティング Set NSUBESU, insulators using solid brass and aluminum thick polar angle, the block floating transformer
構造としていました。 I was a parent.

PD-3000 part pickupPD-3000 The Ministry of Trans -

システムを支えるシャーシにはハニカム形状を採用し，１．２mm厚の鉄板を使用して，高い構造的強度を確保してい Chassis that support the system employs a honeycomb shape, 1.2mm thick steel plate using, to ensure high structural strength
ました。 Fiscal. また，シャーシ全体に銅メッキを施し，不要な振動と磁気歪みを大幅に低減していました。 The copper-plated to give the entire chassis, they significantly reduce unwanted vibration and magnetic distortion.
プレーヤー本体を支える脚も，振動減衰特性の高い大型インシュレーターを採用し，さらにその形状も樹脂成形され The legs supporting the main players, employs a large insulators high vibration damping characteristics, the shape of the molding and more
たハニカム形状にして外部振動の吸収力を高めていました。 Was to increase the absorption of external vibration and honeycomb shape.
光学メカニズムを外部振動から守るため，光学系メカニズムをシャーシからフローティングし，減衰特性のすぐれた特 From external vibration to protect the optical mechanisms, floating from the chassis and the mechanism of the optical attenuation characteristics of the special qualities
殊ゴムとスプリングによる低重心コアキシャルサスペンションを採用し，高剛性で内部損失の大きいセラミックの支柱 By adopting a low center of gravity and spring KOAKISHARUSASUPENSHON especially rubber, ceramic pillars inside the large loss in the high stiffness
で固定して不要な振動を抑えていました。 Was to reduce unwanted vibration fixed.
ＣＤプレーヤーはディスク盤を中央のみで支えるため，外部振動や音圧の影響を受けやすいということで，ディスクを CD player is only the central panel for supporting the disk, all that susceptible to external vibration and sound pressure, the disk
マグネットの吸引力でキャッチしてディスクの共振を抑える「ディスクスタビライザー」を搭載していました。 Suppress the resonance of the disc to catch The attraction of magnets "DISUKUSUTABIRAIZA" had been mounted. また，ローデ The Rohde
ィングトレイ部には比重の大きい特殊樹脂を使用し，重量と精度向上を図っていました。 INGUTOREI to the resin using a special high-density were weight and improving accuracy.

The bottom of the PD-3000

パーツも厳選された高品質ものが使用されていました。 Was used by a carefully selected high quality parts. シャーシにＬ／Ｒ独立でがっちり固定された金メッキピンジャ Chassis L / R Manager-pin gold-plated fixed tightly with independent
ック，極性表示付ＯＦＣ極太４芯電源コード，高品質なフィルムコンデンサー，炭素皮膜抵抗，電解コンデンサーなど Motorfeedback, polar view with thick OFC four core power, high-quality film capacitors, carbon film resistors, and electrolytic capacitors
非常にコストのかかった作りとなっていました。 Was taken and the cost to build.

以上のように，ＰＤ-３０００は，パイオニアがパーツからコンストラクションに至るまで，贅を尽くして高品質に作り上げ As noted above, PD-3000's, to pioneer the construction parts, creating a high quality luxury
た高級機でした。 Could end. パイオニアらしい中庸に音楽を聴かせてくれる癖のないアナログ的な大人の音を持った逸品でした。 McCoy was with the sound of an analog adults can not hear the music habit in moderation PAIONIARASHII.

以下に，当時のカタログの一部をご紹介します。 Here are some of the catalog at the time.

全身で，高音質を奏でる。 The whole body, high quality play.
ＲＥＡＬ　ＴＲＡＮＳＭＩＳＳＩＯＮ　ＤＥＳＩＧＮ REAL TRANSMISSION DESIGN

すべての信号をピックアップし，ピュアに伝送する。 Picks up the signal, transmit the Pure.
◎ＣＤ技術は，高精度デジタル信号処理から始まる。 ◎ CD technology, starting with high-precision digital signal processing.
　　 ●伸びやかな高音を実現する１８ビット４倍オーバーサンプリングデジタルフィルター。 ● To achieve a high note and 18-bit伸BIYAKA OBASANPURINGUDEJITARUFIRUTA four times.
　　 ●微少レベルの再現性を高めるリアル１８ビットツインＤ／Ａコンバーター搭載。 ● Real enhance the reproducibility of micro-level 18-bit twin D / A converter board.
　　 ●読み取りエラーを大幅に低減するアキュフォーカスシステムを採用。 ● AKYUFOKASUSHISUTEMU adopted to reduce read errors.
　　 ●すぐれた読み取り精度，高信頼性を実現。 ● Read a good accuracy, and reliability. 樹脂ボディ採用の新開発ピックアップ。 Employment development in the resin body pickup.
　 ◎どのような条件下でも，余裕の伝送波形を生み出す。 ◎ In what circumstances, produce a waveform of the transmission capacity.
　　 ●サーボ系，オーディオ系を完全分離したツインパワートランス。 ● servo system, audio system TSUINPAWATORANSU completely isolated.
　　 ●常に安定した電源供給を実現するリモートセンシングプッシュプル構成電源。 ● Power RIMOTOSENSHINGUPUSSHUPURU configuration to realize a stable power supply.
　　 ●理想的なレイアウトを追求した大面積の高音質基板。 ● The large high-quality board to pursue the ideal layout.
　　 ●アナログ回路の増幅すべてにＡクラスＦＥＴバッファアンプ採用。 ● in all class A FET amplifier in the analog buffer amplifier employed.
◎ノイズ混入の要因を排除し，高純度な伝送を実現する。 ◎ incorporation to eliminate the factors of noise, transmission and high purity.
　　 ●デジタル回路からの影響を抑えるＮＥＷクォーツマスタークロック。 ● reduce the impact of the digital circuit KUOTSUMASUTAKUROKKU NEW.
　　 ●不使用回路の動作を止め，ノイズ混入を防ぐデジタル・アナログアウト切換機能。 ● Use non-stop operation of the circuit, the switching function prevents mixed digital analog noise Logout.

音は不要な振動から解放され，美しい輪郭を現した。 Sound vibrations are freed from unnecessary現SHITA a beautiful outline.
◎システム全体に貫かれた，無共振化の思想。 ◎ were held throughout the system, the idea of non-resonant.
　　 ●ピックアップを不要振動から守る無共振化ラミサートメカベース。 ● RAMISATOMEKABESU and non-resonant pickup eliminates the need to protect them from vibration.
　　 ●電源トランスからの振動を効果的に抑えるアイソレーテッドトランスベース。 ● AISORETEDDOTORANSUBESU effectively suppress the vibration of the power transformer.
　　 ●不要振動と同時に，磁気ひずみを抑える１．２mm厚銅メッキハニカムシャーシ。 ● No vibration and reduce magnetostriction MEKKIHANIKAMUSHASHI 1.2mm thick copper.
　　 ●ディスクの不要振動を抑えるバーチカルクランプ方式ディスクスタビライザー。 ● DISUKUSUTABIRAIZA BACHIKARUKURANPU method to suppress unwanted vibration of the disc.
　　 ●光学系メカの不要な横揺れを防ぐ，コアキシャルサスペンション＆セラミックメカサポート。 ● to prevent unwanted rolling mechanical optical systems, KOAKISHARUSASUPENSHON & SERAMIKKUMEKASAPOTO.
　　 ●振動特性にすぐれたハニカム構造を採用。 ● adopting a honeycomb structure excellent in vibration characteristics. 大型ハニカムインシュレーター。 HANIKAMUINSHURETA large.
◎音質追求のための高音質パーツ群 ◎ part of the quest for high quality sound
　　 ●接続コードの機械的ストレスが音質に及ぼす影響を排除。 ● eliminate the effect of mechanical stress on the quality of the connection code.
　　 ●ＯＦＣ（無酸素銅）極太４芯電源コードは，＋･－極性表示付き。 ● OFC (oxygen-free copper) cord thick inner 4, +・- with the polarity shown.
　　 ●パーツの一つ一つにまで音質追求の目を向けたＣ・Ｒパーツ類。 ● focus on the pursuit of quality to every part and part C R.
　　 ●高級感あふれる漆黒うるし調デザイン。 ● design style black lacquer feel fine. 無共振化もバックアップ。 And resonance-free backup.
◎リファレンスならではの快適な操作フィーリング。 ◎ feel comfortable operation of the unique reference.
　　 ●ハイスピードリニアモーター採用による平均０．５秒以下の高速アクセス。 ● Employment HAISUPIDORINIAMOTA average 0.5 seconds faster access.
　　 ●静かでスムーズな動作を実現。 ● achieve a smooth and quiet operation. 重量級ローディングトレイ。 Heavy loading tray.
　　 ●オプティカル（光）リンクとコアキシャルの２系統デジタルアウトを装備。 ● Optical (light) of two links and KOAKISHARU system equipped with a digital out.


●ＰＤ-３０００の仕様● ● ● PD-3000 Specifications

●一般● ● General ●
型式 Model コンパクトディスクプレーヤー Compact Disc Player
ピックアップ Pickup ３ビーム半導体レーザー方式 3-beam semiconductor laser system
Ｄ／Ａ変換フォーマット D / A conversion format １６ビット直線 16-bit linear
デジタル演算出力 Digital output operation １８ビット 18-bit
Ｄ／Ａ変換 D / A conversion １８ビット 18-bit
電源電圧 Power supply ＡＣ１００Ｖ，５０／６０Ｈｚ AC100V, 50/60Hz
消費電力 Power Consumption ２６Ｗ 26W
重量 Weight １２．５ｋｇ 12.5kg
外形寸法 Dimensions ４５８Ｗ×１２９Ｈ×４３５Ｄmm 458W × 129H × 435Dmm

●オーディオ特性● ● ● audio characteristics


周波数特性 Frequency response ２Ｈｚ～２０ｋＨｚ±０．３dB（ＥＩＡＪ） 2Hz ~ 20kHz ± 0.3dB (EIAJ)
ＳＮ比 SN ratio １１５dB以上（ＥＩＡＪ） 115dB or more (EIAJ)
ダイナミックレンジ Dynamic Range １００dB以上（ＥＩＡＪ） 100dB or more (EIAJ)
チャンネルセパレーション CHANNERUSEPARESHON １０９dB以上（ＥＩＡＪ） More than 109dB (EIAJ)
ワウ・フラッター Flutter wah 測定限界（±０．００１％Ｗ・Ｐｅａｋ）以下（ＥＩＡＪ） Measurement limit (± 0.001% W Peak) less (EIAJ)
全高調波歪率 Total Harmonic Distortion ０．００１４％以下（ＥＩＡＪ） 0.0014% (EIAJ)
出力電圧 Output voltage ２０Ｖ±０．５Ｖ（ＥＩＡＪ） 20V ± 0.5V (EIAJ)
チャンネル数 Number of Channels ２チャンネル（ステレオ） 2 channels (stereo)
デジタル出力 Digital Output 同軸出力　０．５Ｖｐ-ｐ（７５Ω） Coaxial Output 0.5Vp-p (75Ω)
光出力　　－１５dBｍ～－２０dBｍ（波長６６０nm） Light output-15dBm ~-20dBm (wavelength 660nm)

MacGyver , can you help another fan of PD-91?
I've bought this unit from a friend and it won't play burned discs , just factory.
Can you help me with some walkthrough or some tip what can i do to make it read burned discs.

Thanks in advance

MacGyver , can you help another fan of PD-91?
I've bought this unit from a friend and it won't play burned discs , just factory.
Can you help me with some walkthrough or some tip what can i do to make it read burned discs.

Thanks in advance

there are several variable pots on the transport control board, directly behind the transport itself. those control the LD pickup, focus, tracking, gain and so on. i was able to get the PD-91 i once had running by A: replacing the missing laser lens, and B: adjusting those pots until it started spinning up, attempting to read, and then finally syncing up and playing a factory disc. it is important to first dial it in with a factory disc; once it is playing, fast scanning forward/back, and track skipping, you can then put in a CD-R RECORDED AT 8x OR LESS, PREFERABLY 4x, and massage it to the point where it is reading those CD-Rs as effertlessly as a factory disc. the PD-91 is world class, and the still better japanese market PD-3000 version is in a class of it's own, IMO. i hate myself for frying my poor physical condition, but flawlessly functional PD-91 that i got for $25.00 from a fellow up in CALI because it was missing it's laser lens. there was a rash of defective PIONEER LD pickups in 1987/88, in many single disc and multi disc CDPs. it pains me to think of how many perfectly good CDPs were likely thrown out long before their time due to this manufacturing gaffe. anyway, i fried my PD-91 in a stupid attempted mod. the only thing that assuages the pain of it is my ownership of the JPN PD-3000, a cosmetically like new, but non-functional example. i plan to soon take it in to a tech in PORTLAND, and get it refurbished, no expense spared. i got it by a freak, chance encounter on EBAY, without remote and manual. fortunately, i have the PD-91 remote and manual, so when it finally gets fixed, i'll be all set. until that wonderful day, she sleeps up top my bookshelf, pretty, yet benign:

took a pic of the main PCB that i extracted from the 91 hulk. i also kept the transport, casted transformer and front panel, among some other effects...