PH50 Service Manual
Contents
1. 62903579 weo2 62903579 R753 E 0751 188133 EOS 45708 0751 ow 547 Fi 188133 ma 155133 751 22 rst RISI ust risa R150 C201 R212 E 0251 R252 C301 82 R352 caor 82 1451 R452 100k 100k 10p 100k 4570A T202 109 100k 100k ASTOA 0302 10 100k 10 10 sora 4570A 10p 100k 82 9 R512 B2 R551 1551 552 R550 10 U501A 4570A 100k 82 9 62903560 c155 10v 47u g 10k u202 eg 3 ES 3888 c205 10v 47u 8 18 ES 3808 0258 10v 47u Fae 10k u302 o 8 ES 3808 10v 47u R356 Tok u352 Gag 3 ES 3666 cass 10v 47u RAG 10k Gag 2 2B ES 3888 10v 47u FASS 10k u452 gAs 3 ES 3865 10v 47u FETS 1 uso2 ec ES 3865 c505 10v 47u cios 1613300 10 0 0474 c184 16V 330u C204 16V 330u 19 c209 0 047u Cass 16V 330u C304 16V 330u 7 10 309 0 047 C354 16V 330u 16V 330u 19 0047 1613300 0504 16V 330u RSI7 10 0509 00470 16V 330u2. Service Manual Model 50 Amp Distributor Fostex CAUTION TO PREVENT ELECTRIC SHOCK MATCH WIDE BLADE OF PLUG TO WIDE SLOT FULLY INSERT RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION POUR VITER LES CHOCS LECTRIQUES INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRE SPONDANTE DE LA PRISE ET POUSSER JUSQU AU FOND CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL The lightening flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s en closure that may be of sufficient magnitude to constitute a risk of electric shock to persons The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and mainte nance servicing instructions in the literature accompanying the appliance WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOIS TURE SAFETY INSTRUCTIONS 1 Read instructions All the safety and operating instruc 9 Heat appliance should be situated away from heat tions should be read before the appliance is operated sources such as radiators heat registers stoves or other 2 Retain instruct
3. 3 PHONES OUT 1 3201 3 PHONES OUT 2 4 3 PHONES OUT PHONES OUT 4 3501 3 PHONES OUT 5 09 LL BLOCK DIAGRAM INPUT PEAK OUTPUT LEVEL 1 GT od 1 PHONES 1 4dBu 10dB ST MONO IN gt 2 BALANCE IN OUTPUT LEVEL 2 7 o a E gt 2 R 7 NI E PHONES 2 OUTPUT LEVEL 3 42 E PHONES 3 UNBALIN 5 ZS gt AUX IN LEVEL 4 7 2 2 gt i RO D PHONES 4 OUTPUT LEVEL 5 CHANNEL IN AN PHONES 5 9 07 50 OL CASCADE OUT OR 09 FOSTCX FOSTEX CORPORATION 3 2 35 Musashino Akishima Tokyo Japan 196 0021 FOSTEX CORPORATION OF AMERICA 15431 Blackburn Ave Norwalk CA 90650 U S A PRINTED IN JAPAN JUNE 1998 8288774000
4. 5 5099 3 espe 1 TS 099 8194 9999 ii oa ott o 522 2198 E Mira 9 if DSe 29659 a Se y A ing 8 LL 793 1089 NESS gt ij po 2 pal 5 ees 11111 o go ea NGA 65 Bra o H a e 99 2299 NG sl ZI oH evs wua 22222 e 12 5520 2910 Salo O 2 2 2275 LO 1000 OLS 8 BA 6 41909 Zon OR ese 008 Soa Ss La RI 5268 Ea UN 7 lt 0 Be 8 5020 pyzsor 9598 E lt gt 1199 a 8 EX KE G casu 094 S15 lt gt 55 0 nm gt 498 En lt LE a 10 01 4 CIRCUIT amp BLOCK DIAGRAMS UNBAL INL L 9341D 5V 8259 gt 1 1048 0 4dBu 10dBV 3 BR C603 5 2510221 a2 8617 7 ONT 25 22 E HTJ064 a 4 C654 4570A 5 10004 25V 22u 3 667 25 2 CASCADE QUT L CASCADE OUT R 0601 1 9340 5 TEMIZAHE n OUT caso 998 5 as 620 25088000 To Tanstormer DHI REIS A 2svii000u 82 peo
5. 621 661 622 662 623 663 624 664 625 665 626 666 627 667 628 668 629 669 630 670 631 671 632 672 633 673 8240284001 8230138393 8230138393 8230138104 8230138332 8230138332 8230138332 8230138103 8230138100 8230111568 8230138332 8230138393 8230138393 8230138104 8230138332 8230138332 8230138332 8230138103 8230138100 8230111568 8230138332 8240284001 8230138104 8230138103 8230138103 8230138103 8230138103 8230138104 8230138104 8230138103 8230138103 8230138822 8230138822 8230138822 8230138822 8230138103 8230138103 8230138102 8230138104 8230138393 8230138393 8230138332 8230138103 8230138103 8230138393 8230138101 VR RKO9K120A1NA 5KQA x 2 HT CARBON 1 4W 39KQ 5 HT CARBON 1 4W 39KQ 5 HT CARBON 1 4W 100K 5 HT CARBON 1 4W 3 3KQ 5 HT CARBON 1 4W 3 3KQ 5 HT CARBON 1 4W 3 3KQ 5 HT CARBON 1 4W 10KQ 5 HT CARBON 1 4W 100 5 H METAL 5 6 5 HT CARBON 1 4W 3 3KQ 5 HT CARBON 1 4W 39KQ 5 HT CARBON 1 4W 39KQ 5 HT CARBON 1 4W 100 5 HT CARBON 1 4W 3 3KQ 5 HT CARBON 1 4W 3 3KQ 5 HT CARBON 1 4W 3 3KQ 5 HT CARBON 1 4W 10KQ 5 HT CARBON 1 4W 10 5 H METAL 5 6Q 5 HT CARBON 1 4W 3 3 5 VR RKO9K120A1NA 5 x 2 HT CARBON 1 4W 100KQ 5 HT CARBON 1 4W 10KQ 5 HT CARBON 1 4W 10KQ 5 HT CARBON 1 4W 10KQ 5 HT CARBON 1 4W 10KQ 5 HT CARBON 1 4W 100KQ 5 HT C
6. 8232096338 8232096108 8232804104 8232804104 8232144226 8232144226 8232901473 8232901473 8232096108 J603 1651 1652 J701 J706 50 10PF 5PF SL 25 0 1 80 20 PES 50V 0 001 uF 5 AMZV ALU 16V 20 SME VB ALU 10 47uF 20 SME VB CER 25 0 1uE 80 20 YF CER 25 0 1uE 80 20 YF PES 50V 0 047 5 AMZV CER 50 10PF 5PF SL PES 50 0 001 5 AMZV ALU 16V 330uF 20 SME VB ALU 10 47uF 20 SME VB PES 50V 0 047 5 AMZV 25 0 115 80 20 YF 25 0 115 80 20 YF ALU 25V 22 20 SME VB ALU 25V 22 20 SME VB ALU 25V 22uF 20 SME VB CER 50V 100PF 5 SL CER 50V 100PF 5 SL 25 0 1uE 80 20 YF ALU 25V 22 20 SME VB 50 0 5PF SL ALU 25 22uF 20 SME VB 50 10PF 5PF SL CER 25 0 1uE 80 20 YF ALU 25V 22 20 SME VB 50 10PF 5PF SL ALU 25 22uF 20 SME VB ALU 50 2 24 20 BP SME VB ALU 50 2 2uF 20 SME VB ALU 50 2 2uF 20 SME VB ALU 25V 22 20 SME VB 25 0 1uE 80 20 YF ALU 25 1000UF 20 SME VB ALU 25 3300UF 20 SME ALU 25 1000UF 20 SME VB CER 25 0 1uE 80 20 YF 25 0 1uE 80 20 YF ALU 25 22uF 20 SME VB ALU 25 22uF 20 SME VB PES 50 0 047 5 AMZV PES 50 0 047 5 AMZV ALU 25 1
7. N lt Rear Panel gt 5 2 IN sui F E 4dBu 10dBV ian TOTO 2 00000 1odBv A CASCADE OWT INPUT UX IN roda 11 12 13 14 15 9 Channel input jacks CHANNEL IN 1 5 13 AUX input jacks AUX IN 10 Balanced input connector XLR INPUT 14 Balanced input level selector switch 4dBu 10dBV 11 Cascade output jack CASCADE OUT 15 Balanced input connector Stereo phone INPUT 12 Unbalanced input jack INPUT PH 50 3 EXPLODED VIEW PCB ASSEMBLY AND PARTS LIST O PH 50 OVERALL EXPLODED VIEW 8 PARTS LIST Ref No Part No Description Ref No Part No Description 1 8221262000 CASE COVER PH 50 8274175000 PCB Assy VR PH 50 2 8221264000 PANEL FRONT PH 50 8226198003 ROTARY KNOB C G 3 8274174000 PCB Assy MAIN PH 50 10 8226198001 ROTARY KNOB A A 4 8650800000 CORD USA CND A 11 8242256003 TRANS POWER 120V 8650801000 CORD AC EUR 8242256006 TRANS POWER 230V 8650802000 CORD AC UK 8242256010 TRANS POWER 100V 8650803000 CORD AC 12 8221263000 CHASSIS MAIN PH 50 5 8207000208 BUSHING SR 4N 4 A 13 8253014007 SW WL PUSH POWER SDDLB SPST 8218775001 INSULATION SHEET PH 50 14 8207000318 PLASTY FOOT 3725 7 8228775002 INSULATION SHEET B PH 50 15 8226228000
8. Peak LED Indication GENERAL Dimensions Weight Power supply JPN USA CND EUR UK Power consumption XLR Hot Pin 2 Stereo phone Hot 4dBu 10dBV switchable 10 or more RCA pin 10dBV 10 kQ or more RCA pin 10dBV 10 kQ or more RCA pin 10dBV 10 kQ or more Stereo phone 500 mW or more 32 Q load Distortion 3 0 or less 8 320 30 20 kHz 24 32 load 1kHz 200 mW 65dBV or less DIN AUDIO OUTPUT MIN 80dBV or less IHF A OUTPUT VR MIN 0 1 or less 32 Q load 1kHz 200 mW RCA pin 10dBV 3dB INPUT VR CAL 30 20 kHz 1dB 85dBV or less DIN AUDIO OUTPUT VR MIN 90dBV or less IHF A OUTPUT MIN 0 05 or less 1kHz 10dBV 20dB Vp p or less OUTPUT VR MIN 40dB Vp p or less Measure noise level when one side of appliance 18 dropped 3 times from 5 cm height 7dBV 3dB 210 W x 200 D x 43 H mm 1 9 kg 100 VAC 50 60 Hz 120 VAC 60 Hz 230 VAC 50 60 Hz 8 W Specifications and appearance are subject to change without notice for product improvement PH 50 2 CONTROLS INDICATORS 8 CONNECTORS lt Front Panel gt Headphone output level control knob PHONES 1 5 AUX input level control knob AUX IN Peak LED PEAK Power LED POWER Headphone jacks PHONES 1 5 Input image position selector switch ST MONO Input master level control knob INPUT Power switch POWER gt
9. tions All other servicing should be referred to qualified service personnel TABLE OF CONTENTS 1 SPECIFICATIONS des 4 2 CONTROLS INDICATORS AND CONNECTORS 5 3 EXPLODED VIEW PCB ASSEMBLY AND PARTS LIST 6 4 CIRCUIT amp BLOCK 5 10 NOTES Parts List and circuit diagrams are given in this manual to assist the service technician in maintaining the Model 50 following accessories are supplied with 50 as the standard accessories Owner s manual 8288384000 for export model Owner s manual 8288385000 for domestic model Following is the packing material for the Model PH 50 PACKING SIDE A 50 8228445000 CARTON BOX PH 50 8228721000 CAUTION A Parts marked with this sign are safety critical components They must always be replaced with identical components Refer to the Fostex Parts List and ensure exact replacement PH 50 PH 50 1 SPECIFICATIONS INPUT SECTION INPUT Balanced Connector Input level Impedance INPUT Unbalanced Connector Input level Impedance CHANNEL INPUT Connector Input level Impedance AUX INPUT Connector level Impedance OUTPUT SECTION PHONES 1 5 Connector Max Output Level Load Impedance Frequency Response S N Distortion CASCADE OUT Connector Output level Frequency Response S N Distortion Click Noise Power on off Shock Noise
10. 000UF 20 SME VB S601 5602 601 602 W603 MISCELLANEOUS Part No 8745503003 8245337000 8245268002 8245311004 8245337000 8245268002 8245311006 8245311001 8253467000 8253467000 8277473001 8277473001 8277473002 8207012800 Description CONN XH 3P 87003048 CONN PHONE JACK STEREO CONN PL JACK XLR31 NC3FAH2 CONN RCA 4P YKC21 3084 CONN PHONE JACK STEREO CONN PL JACK XLR31 NC3FAH2 CONN RCA 6P YKC21 3154 CONN RCA 1P YKB11 0273 SW SS010 P022MAM PA9 SW SS010 P022MAM PA9 CORD SCN SCN 8P x 200 CORD SCN SCN 8P x 200 CORD SCN SCN 10P x 200 HEATSINK PC1115 25 PH 50 82094 27 lt lt 9 LS 6 por gt S 9 1 31 HIIT mus a NIE Sos SUI 1 1 i 2 0594 g 537 8 3 a sons 8 gt issu 9998 OESTE gt 9698 gt BEN ME cc 5 5 MUD N i gt Sua 22690 lt lt 8 Ma maa 7 NG aci LATINA iy 7 2 LOR 2296 1 god A zou 9708 lea MAA DES Re i punk ras Jag T UIJ S 8 5 gt 251998 EN 32 298 7999 9099 ogre DIR A BOSE jak vere i 9 pus o 20 6
11. ARBON 1 4W 100KQ 5 HT CARBON 1 4W 10KQ 5 HT CARBON 1 4W 10KQ 5 HT CARBON 1 4W 8 2K 5 HT CARBON 1 4W 8 2KQ 5 HT CARBON 1 4W 8 2 5 HT CARBON 1 4W 8 2 5 HT CARBON 1 4W 10KQ 5 HT CARBON 1 4W 10KQ 5 HT CARBON 1 4W IKO 5 HT CARBON 1 4W 100KQ 5 HT CARBON 1 4W 39KQ 5 HT CARBON 1 4W 39KQ 5 HT CARBON 1 4W 3 3KQ 5 HT CARBON 1 4W 10 5 HT CARBON 1 4W 10 5 HT CARBON 1 4W 39 5 HT CARBON 1 4W 1000 5 PH 50 PH 50 Ref ALU Electrolytic CER Ceramic type PES Mylar type Part No CAPACITORs Ref No CN803 J101 601 Description J602 C101 501 C102 502 C103 503 C104 504 C105 505 C107 C108 C109 509 C151 551 C153 553 C154 554 155 555 159 559 C307 C308 C601 651 C602 652 C603 653 C604 654 C605 655 C606 656 C607 657 C608 658 C610 660 C611 661 C612 662 C614 664 C615 665 C617 667 C620 C621 C622 C701 705 C751 753 C801 C802 C803 C804 C805 C806 C807 C808 C809 C810 8232050100 8232804104 8232901102 8232143337 8232142476 8232804104 8232804104 8232901473 8232050100 8232901102 8232143337 8232142476 8232901473 8232804104 8232804104 8232144226 8232144226 8232144226 8232050101 8232050101 8232804104 8232144226 8232050100 8232144226 8232050100 8232804104 8232144226 8232050100 8232144226 8232153225 8232146225 8232146225 8232144226 8232804104 8232096108
12. BUTTON PUSH POWER BBT 3x6 BZn 2 BBT 3x6 BZn 50 Parts List e MAIN VR PCBs ICs Ref No Part No Description U101 501 8236035803 uPC4570HA U102 502 8236046000 IC NJM386BD U152 552 8236046000 IC NJM386BD U601 8236035803 uPC4570HA 0602 8236035803 uPC4570HA 0605 8236035803 uPC4570HA 0651 8236035803 uPC4570HA 0701 8236035803 uPC4570HA 0801 8236032005 REGULATOR NJM78M12FA 0802 8236034705 REGULATOR 79M12FA TRANSISTORs Ref No Part No Description Q601 8234108900 TR 2SD1858 QR T Q602 8234108900 TR 2SD1858 QR T Q603 8234108800 TR 2SB1237 PQR T Q604 8234108900 TR 2SD1858 QR T Q801 8234107600 TR 2SC4549 NEC DIODES Ref Part No Description D601 8234106500 LED RT3 222HCS D602 8234500700 D HT 1SS136 D603 8234500700 D HT 155136 D751 8234500700 D HT 155136 D752 8234106500 OPT LED RT3 222HCS D753 8234500700 D HT 155136 D754 8234500700 D HT 155136 D801 8234108700 D RB151 D802 8234106500 OPT LED RT3 222HCS Ref No Part No RESISTORS Description R101 501 R110 510 R111 511 R112 512 R113 513 R114 514 R115 515 R116 516 R117 517 R118 518 R119 519 R150 550 R151 551 R152 552 R153 553 R154 554 R155 555 R156 556 R157 557 R158 558 R159 559 R601 602 R610 650 R611 651 R612 652 R613 653 614 654 615 655 R616 656 617 657 618 658 619 659 620 660
13. guid Care should be taken so that A DI objects do not fall and liquids are not spilled into the en closure through openings An appliance and cart combination should be moved with 16 Damage requiring Service appliance Snou dioe ser viced by qualified service personnel when care Quick stops excessive force and uneven surfaces tu A The power supply cord or the plug has been damaged may cause the appliance and cart combination to over turn ak 7 Wall or Ceiling Mounting The appliance should be B Objects have fallen or liquid has been spilled into the A appliance or mounted to a wall or ceiling only as recommended by the manufacturer C The appliance has been exposed to rain or 8 Ventilation The appliance should be situated so that its B The appliance coes not 2 toroperate norma yor a A exhibits a marked changed in performance location or position does not interfere with its proper ven E The appliance has been dropped or the enclosure tilation For example the appliance should not be situ damaged ated on a bed sofa rug or similar surface that may block 17 Servicing The user should not attempt to service the the ventilation openings or placed in a built in installa tion such as a bookcase or cabinet that may impede the flow of air through the ventilation openings pliance beyond that described in the operating instruc
14. ions The safety and operating instructions appliances including amplifiers that produce heat should be retained for future reference 10 Power Sources The appliance should be connected to a 3 Heed warnings All warnings on the appliance and in the power supply only of the type described in the operating operating instructions should be adhered to instructions or as marked on the appliance 4 Follow instructions All operating and use instructions 11 Grounding or Polarization The precautions that should should be followed be taken so that the grounding or polarization means of 5 Water and Moisture The appliance should not be used an appliance is not defeated near water for example near a bathtub washbowl 12 Power Cord Protection Power supply cords should be kitchen sink laundry tub in a wet basement or near a routed so that they are not likely to be walked on or swimming pool and the like pinched by items placed upon or against them paying 6 Carts and Stands The appliance should be used only particular attention to cords at plugs convenience recep with a cart or stand that is recommended by the manufac tacles and the point where they exit from the appliance turer 13 Cleaning The appliance should be cleaned only as rec ommended by the manufacturer 14 Periods power cord of the appliance should be unplugged from the outlet when left unused for long period of time 15 Objeci and Li
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