Fostex X-24 User's Manual
Contents
1. 7902 bora Pp I I l l sora XC I I v 805 z l 9V9 I 1000 pe sp 0 2 A 5 8 E mo pet rosa py tto X ot Ed2. 3 dB 3 dB 40 Hz 400 Hz 12 5 kHz Test tape AC 514 NR OUT recording level 0 dB 3 dB 3 dB 40 Hz 400 Hz 12 5 kHz Test tape AC 514 NR IN recording level 25dB 5 6 dB 250 Hz 10 kHz 12 5 kHz RECORDER SECTION continued Level Deviation at Reference Output Level PLAY REC amp PLAY S N PLAY REC amp PLAY Distortion REC amp PLAY Erasure Ratio Cross Erasure Channel Separation Sync Crosstalk Bias Leakage Click Noise PLAY gt STOP REC STOP Monitor PLAY Punch In Out Shock Noise 1 dB or less at 400 Hz NR OUT TCW 231 test tape 3 dB or less at 40 HZ 12 5 kHz NR OUT SCW 977 TCW 284F test tape 1 dB or less at 400 Hz NR OUT AC 514 test tape 2 dB or less at 100 Hz 10 NR OUT AC 514 test tape 47 dB or more NR OUT DIN AUDIO 55 dB or more NR OUT IHF A 45 dB or more NR OUT DIN AUDIO 48 dB or more NR OUT IHF A 48 dB or more NR IN DIN AUDIO 55 dB or more NR IN IHF A 2 or less Input signal 1 kHz standard level standard fader position with 400 Hz HPF amp 30 kHz LPF 67 dB or more at 1 kHz Input signal 1 KHz 0 dB V standard fader position with 1 kHz BPF 1 dB or less Input signal 10 KHz 10 dB V standard fader position Measure level difference when adjacent track is put into REC mode 50 dB or more Input signal 1 KHz 10 dBV standard fader position with 1 kHz BPF Measur
3. ang 2 3S00PIPP m 222 22215 u 8 1 1 us 2 TU ua PGH ADJUST Rab Rar RI E 2 2 2 SUB mus qme US ue z h TATAAEK um DTATAAEK B DTATAAEK 2 OTATAAEK u22 B TRANSPORT m E o 027 PP ok P cus Im orr js m 4 REG LEVEL DIC ark ERIT Q T M E C123 REC LEVEL ie cas mo HZ 1 iR 2 2 a UB a E A le b Tap M E 622 REC LEVEL 2 b f E cao NON cum Rog W M E notae p AD M Caz
4. uva 9V Do Sien l z 3 aL alo o a ra s rog 2060 22 wOVh 29 2 vin I 85 y LA 3 2 4 HONNA 1 9 x l I owen 1 I i I 2 1 s 1 I a Y atO On 1 L 1 2 NET 170 S3NOHd E 9 39A LI Gum 4 5 I I viozn 1 1 1 gv 00 1 4 70 1 2 1 gus su Y m 1 2 1 110034315 n el La i 1 T vion I 4 1 LI tiiH l 55 89d 3XIVI 2 1 89d MOVE d3XIN 23 R P REGULATOR PCBs TAPE QUT Bv 931111133 TAKI PCB 43211254 8 39 6106 ing 2 390 408 Lev TEN 2 s H yo Doby 8 TE en Meee Lev NH 2 D P END 88 4 i 550 m ci 4708 Meee Lev ord 2215 ii il jo Doisy 8 pra aora T ja 20 gt cas 082
5. gt ps 2 abre 6 i ohm 20m 10dBV 8 PB RTN CADRE REC BARGRAPH RING SEND REC TRK 2 Q CCICICIC 1 PB 577 2 pi Lip LINE ININSERT 3 10dBV a CICICIILCICI RING SEND FADER REC TRK 3 so 2 PB Q 4 Be PAN TAPE OUT LINE 4 9 4 A 21 INPUT RING SEND FADER 4 3 1 4 OX 2 i F MIC IN 1 3 10dBV lt gt 50dBV TRIM 8 TIH IN 2 4 10dBV lt gt 50dBV TRIM 3 1 7 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 8288772000
6. 5 R020 8230 138473 carbon 1 4W 47 5 R135 435 8230 1382 22 HT carbon 1 4W 2 2 5 R021 8230 138103 HT carbon 1 4W 10 5 R136 436 8230 1382 20 carbon 1 4W 220 5 R022 026 8230 1384 73 carbon 1 4W 47 5 R027 8230 138103 HT carbon 1 4W 10 5 CAPACITORs R028 029 8230 1384 73 carbon 1 4W 47 5 ALU Hlectrolytic type R030 8230 1381 03 HT carbon 1 4W 10 5 CER Ceramic type R031 8230 1384 73 carbon 1 4W 47 5 PES Mylar type R032 8230 138103 carbon 1 4W 10 5 PPR Polypropylene type R033 8230 138473 carbon 1 4W 47 5 Ref No Part No Description R038 8230 138103 HT carbon 1 4W 10 5 001 8232 8031 03 50 0 01 40 8230 1381 05 carbon 1 4W 1 5 002 8232 1444 77 ALU 25V 470 20 SME R041 8230 1381 03 HT carbon 1 4W 10 5 C003 8232 1441 07 ALU 25V 100uF 20 SME R042 8230 1383 32 carbon 1 4W 3 3 5 C004 8232 1421 07 ALU 10V 100uF 20 SME R043 8231 5033 32 R TRIM PIT carbon 3 3kQ 637T C005 8232 1432 26 ALU 16V 22uF 20 SME R044 8230 1385 11 HT carbon 1 4W 5100 5 C006 007 8232 142227 VT ALU 10V 220 20 SME R050 8230 1382 03 carbon 1 4W 20 5 C008 009 8232 1421 07 ALU 10V 100uF 20 SME R051 8230 1384 72 HT carbon 1 4W 4 7 5 C012 8232 1432 26 ALU 16V 22uF 20 SME R052 8230
7. Service Manual Model 24 multitracker Fostex CAUTION TO PREVENT ELECTRIC SHOCK MATCH WIDE BLADE OF PLUG TO WIDE SOLT 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 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 The 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 instructions The safety and ope
8. 128 428 8232901103 VT PES 50V 0 01uF 5 C001 002 8232901103 Capacitor VT PES 50V 0 018 AMZV MISBEEDAREDUS 011 8276 908420 Cable flat 4P L200 ___ Y101 8207 0122 04 Holder cable 4P 51048 E001 Wire jumper IPS 1041 2 F5 E002 Wire jumper IPS 1041 3 F7 5 E003 Wire jumper IPS 1041 4 F10 E004 Wire jumper IPS 1041 5 F12 5 Abbreviation J001 8245 541000 Connector PL jack DC inlet YKB31 0012 ST Small Outline Package J002 8245 3080 02 Connector PI jack 254 Single In line Package 1003 8245 5470 09 Connector jack 9P WHT 220 TO 220 type 1004 8245 2260 01 Connector PL jack RCA SDI Shrink DIP dual in line YKC21 3115 SOP Small Outline Package J005 8245 3080 06 Connector PI jack SBRK 65 4 HT Horizontal mount taping device J006 8245 3080 13 Connector PI jack SBRK 1354 Vertical mount J007 8245 3080 08 Connector PI jack SBRK 85 4 Vertical mount Taping device 1008 8245 3080 09 Connector PI jack SBRK 95 4 PE Penetrate mount I form straight 1009 010 8245 5280 01 Connector PI jack PL Penetrate mount L form right angle RT 01T 1 0B Penetrate mount Taping device 1011 8245 3080 04 Connector PI jack SBRK 45 4 Penetrate mount I form Taping device J101 8245 547005 Connector PI jack PH 5L WHT J201 8245 5471 05 Connector PI jack PH 5P RED X 24 5 CIRCUIT amp BLOCK DIAGRAMS
9. 6580 00 Sheet meter X 24 20 8226 2091 01 Knob cassette REW 14 24 2 8212 5931 00 Cover cassette X 14 24 21 8226 208101 Knob cassette FF X 14 24 3 8212 6050 00 top 24 22 8226 211101 Knob cassette STOP X 14 24 4 8226 159004 Knob fader N7 GR 23 8226 212101 Knob cassette PAUSE X 14 24 5 8226 1590 05 Knob fader 7 R 24 8216 6600 00 Shield center X 24 6 8226 2070 02 Knob pitch gain N7 25 8274 1340 00 assy Jack 24 7 8226 207001 Knob pitch 7 26 8221 2260 00 Bracket jack 24 8 8216 6490 00 Cushion cover X 14 24 A 27 8274 1350 00 assy X 24 9 8216 4230 00 Reflector cassette 28 8204 082000 Plate mounting 10 8214 211000 Spring cassette 18 14 24 29 8212 606000 Case bottom X 24 11 8216 6590 00 Shield top X 24 AN 30 8270 7270 03 AC adaptor AD 12A USA CND 12 8226 2360 01 Knob sel bounce X 24 8270 7270 06 AC adaptor AD 12A EUR 13 8204 037001 Ring CSTW 2 8270 7270 07 AC adaptor AD 12A UK 14 8226 162005 Knob volume N7 Y 8270 7270 10 AC adaptor AD 12A JPN 15 8274 1330 00 assy Mixer 24 8274 1400 00 55 Regulator 24 16 8216 661000 Shield bottom 24 32 8216 6800 00 Sheet isolation 24 17 8270 8240 00 Transport assy X 24 33 8277 4470 15 Cable assy earth lug D3 8MF F 18 8226 2131 01 Knob cassette REC X 14 24 L150 19 8226 210101 Knob cassette PLAY X 14 24 X 24 TRANSPORT EXPLODED VIEW 8 PARTS LIST Ref No P
10. AL 14 gg n 2 mg ay Ee E 96 OT 15 2 JACK PCBs R P REGULATOR PCBs 75 sa XC OC e fet m I lt en p 7 X 24 Parts List MIXER PCB Ref No Part No Description Ref No Part No Description 8274 133000 assy Mixer X 24 R108 408 8230 1384 32 carbon 1 4W 4 3 5 B001 8251968001 Plain PCB Mixer X 24 R109 409 8230 1383 03 carbon 1 4W 30 5 R110 410 8230 138473 carbon 1 4 47 5 R111 411 8230 1381 23 carbon 1 4W 12 5 Ref No Part No Description R112 412 8230 138104 carbon 1 4 100 5 U001 8236 5405 00 ST analog NJM2068M R113 413 8230 1381 23 carbon 1 4W 12 5 002 004 8236 7207 00 analog NJM4560M R114 414 8230 1381 23 carbon 1 4W 12 5 0005 8236 0352 03 SIP analog NJM4556AL R115 415 8230 1384 73 carbon 1 4W 47 5 0006 8236720700 ST analog NJM4560M R116 416 8230 138243 carbon 1 4W 24 5 007 012 8236 5707 01 ST digital DTA144EK R117 417 8230 138243 HT carbon 1 4 24 5 U101 401 8236500000 ST digital CMOS 4066BF R118 418 8230 1383 03 carbon 1 4 30 5 U102 402 8236 5706 01 ST digital DTCI44EK R119 419 8230 1383 03 HT carbon 1 4W 30 5 U103 403 8236 5706 01 ST digital DTC144EK R
11. T301 for minimum voltage at TP306 Then confirm that the voltage at TP305 is more than 55 mV Track 4 Adjust T401 for minimum voltage at TP406 Then confirm that the voltage at 405 is more than 55 mV 3 11 Coarse Bias Adjustment At coarsely adjusting the bias current put a blank cassette tape to the transport and the track to be adjusted is put in REC mode Assuming the track 1 to be adjusted the oscilloscope probe is connected to the test point TP104 on the R P PCB assy and rotate and fix the pot R133 220 at 60 mV Adjust the remaining tracks in the same way Track 2 Adjust R233 so that the voltage at TP204 is 60 mV Track 3 Adjust R333 so that the voltage at TP304 is 60 mV Track 4 Adjust R433 so that the voltage at TP404 is 60 mV 3 12 Record Level Calibration The procedures up to 3 10 must be completed before proceeding to this adjustment 1 Put a blank cassette tape to the transport and apply a 400 Hz 10 dBV 0 3 V sine wave signal to the INPUT 1 and 2 phone jacks In the case the signal is input from XLR jack the terminal No 3 COLD and No 1 GND must be shortened 2 Set the controls as follows Record track select switch All tracks ON Confirm that the REC TRK LEDs 1 4 are blinking Trim knob At minimum Dolby B noise reduction on off switch OFF 3 Connect an AC volt meter to the TAPE OUT 1 4 pin jacks 4 Put the transport into REC PAUSE mode and adjust the Input Fader so that the level at T
12. mode 1 leaking into the track being reproduced When sync crosstalk is excessively high playback output during overdubbing will sound muddy by effect of the recording signal leakage or cause oscillation at pingpong recording where the playback output is transferred to another track 1 Set the controls as follow and put a blank tape to the transport Trim knob At minimum Input fader Standard position At 8 1 Dolby B noise reduction on off switch OFF 2 Apply a signal whose level is 10 dB V 0 3 V 3 Put one track into REC mode and check if the level at TAPE OUT on an adjacent track is within the specifications listed below when sweeping the oscillator frequency At 1 kHz 25 dBV or less 1 20 kHz 10 dBV or less 3 18 S N Measurement 3 18 1 Reproduce 1 Set the control as follow Dolby B noise reduction on off switch OFF 2 Connect an AC volt meter and put the transport into PLAY mode without loading a tape 3 Check if the AC volt meter reading is within the following specifications DIN AUDIO 47 dB IHF A 55 dB 3 18 2 Record and reproduce Overall 1 Set the control as follow Dolby B noise reduction on off switch OFF 2 Put a blank cassette tape and start recording without applying a signal 3 Rewind the tape to the start point and play it back 4 Check if the AC volt meter reading is within the following specifications DIN AUDIO 45 dB IHF A 48 dB 5 Next turn the Dolby switch on and repeat the above pr
13. 01 Connector jack 01 1 0 w y Ref No Part No Description J104 404 8245 298000 Connector PL jack phone 8274 1350 00 assy R P 24 LGR4609 7000 B001 8251 9700 01 Plain PCB R P 24 5001 005 8253 1350 02 Switch PT tact SOR 112HS 005 8207 0122 09 Holder cable 9P 51048 ICs Y006 8207 012213 Holder cable 13P 51048 T Ref No Part No Description Y007 8207 0122 08 Holder cable 8P 51048 U001 N A 008 8207 0122 06 Holder cable 6P 51048 i U002 8236 0782 06 PT digital driver DTA143TS W001 8277 016015 Cable assy shield 2C 3P U003 8236 0361 00 SIP analog BA4560N WHT 9073 L150 U004 022 8236 5707 01 ST digital driver DTA144EK W002 8277 0161 30 Cable assy shield 2C 3P 0023 8236 0837 00 SDI digital CPU X 24 RED 9073 L300 2 TMP47C200BN W003 8277 0162 50 Cable assy shield 2C 0030 031 8236570601 ST digital driver DTC144EK BLK 9073 L500 ae 0040 8236 5706 01 ST digital driver DTCI44EK W005 8276 9086 25 Cable flat 6P L250 he 0041 8236 570701 ST digital driver DTAI44EK W006 8276 9093 25 Cable flat 13P L250 U101 401 8236 5405 00 ST analog NJM2068M W007 8276 9088 25 Cable flat 8P L250 U102 402 8236 0457 00 SOP analog HA12135AF W008 8276 9089 25 Cable flat 9P L250 Mo U104 404 8236 5701 03 ST digital driver DTC114TK U105 405 8236 5707 01 ST digital driver DTA144EK JACK PCB U106 406 8236 5701 03 ST digital drive
14. 120 420 8230 138123 carbon 1 4W 12 5 U104 404 8236 0832 00 SIP analog LED driver BA6124 R121 421 8230 1385 12 HT carbon 1 4W 5 1 5 U105 205 8236 570201 ST digital driver DTC314TK R122 422 8230 1381 03 carbon 1 4W 10 5 R125 425 8230 1384 73 carbon 1 4W 47 5 DIODEs R126 426 8230 138123 HT carbon 1 4W 12 5 Ref No Part No Description R127 427 8230 1381 23 carbon 1 4 12 5 D001 005 8234 104602 Opt VT LED R130 230 8240 171028 Pot PI RT14 100kOCC SLR 332MC TE7 14 123 L15 2006 8234 1046 01 Opt VT LED RED R131 8240 2740 03 Pot PI 5L30 20 RS30H111 SLR 332VC TE7 R133 433 8240 1670 06 Pot PI 50 09 113 2007 8234 1046 02 Opt VT LED R134 434 8240 2740 04 Pot PL 51 30 20 RS30H121 SLR 332MC TE7 R135 8240 1670 08 Pot PI RTO9 10 RK09K113 D101 401 8234 5007 00 155136 R150 250 8230 1386 83 carbon 1 4W 68 5 D102 402 8234 5007 00 155136 R151 250 8230 138123 HT carbon 1 4W 12 5 D103 403 8234 1046 03 Opt VT LED YEL R152 252 8230 1382 43 carbon 1 4W 24 5 SLR 332YC TE7 R153 253 8230 1384 73 carbon 1 4W 47 5 D104 404 8234 1046 03 Opt VT LED YEL R154 254 8230 1381 02 carbon 1 4W 1 5 SLR 332YC TE7 R155 255 8230 1384 73 carbon 1 4W 47 5 D105 405 8234 1046 03 Opt VT LED YEL R156 256 8230 1381 60 carb
15. 1383 32 HT carbon 1 4W 3 3 5 C020 025 8232 8031 03 CER 50V 0 01 YF R053 8230 1384 73 carbon 1 4W 47 5 C028 8232 8181 04 CER 25V 0 YF R054 8230 138470 HT carbon 1 4W 470 5 C029 8232 8031 03 CER 50V 0 01 YF R055 8230 138333 HT carbon 1 4W 33 5 C050 8232 1421 07 ALU 10V 100uF 20 SME R056 8230 1384 72 HT carbon 1 4W 4 7 5 C051 8232 9011 04 PES 50V 5 AMZ R101 401 8230 1382 43 carbon 1 4 24 5 C052 8232 9012 23 VT PES 50V 0 022uF 5 AMZ 21 X 24 22 Ref No Part No Description Ref No Part No Description C053 054 8232901472 VT PES 50V 0 0047uF 5 AMZ 1301 8245 5472 05 Connector Pl jack 5 BLU C055 8232 1431 06 VT ALU 16V 10uF 20 SME 1401 8245 5473 05 Connector PI jack 5P 101 401 8232801561 50 560 5 SL 1001 8242 1420 00 bias 150 1 102 402 8232 1461 05 ALU 50V 20 SME L101 401 8256 0660 00 Module trap 80kHz 103 403 N A L102 402 8256 0990 00 Module MPX XR 5 X 24 104 404 8232801221 CER 50V 220pF 5 SL L103 403 8256 0660 00 Module trap 80kHz 105 405 8232 9018 22 VT PES 50V 0 0082uF 5 AMZ S001 002 8253652005 SW PL slide 2 2 106 406 8232 142476 VT ALU 10V 47 20 SME non shortening SSSU1 1 09 107 407 8232146225 VT ALU 50V 2 2uF 20 SME 001 8276001000 Pin heade
16. 7 00 155136 R116 416 8230 138241 carbon 1 4 2400 5 104 404 8234 5007 00 155136 R117 417 8230 1382 02 carbon 1 4W 2 5 R118 418 8230 1382 02 carbon 1 4 2 5 RESISTORs R119 419 8230 1382 02 carbon 1 4W 2 5 Ref No Part No Description R120 420 8230 1384 72 carbon 1 4W 4 7 5 001 8230 138821 carbon 1 4W 8200 5 R121 421 8231 503223 PIT carbon 22 6371 R002 8230 1383 94 carbon 1 4W 390 5 R122 422 8230 1386 22 carbon 1 4W 6 2 5 R003 8230 1382 03 carbon 1 4W 20 5 123 423 8230 1383 63 carbon 1 4 36 5 4 005 8230 1381 03 carbon 1 4 10 5 R124 424 8230 1381 53 carbon 1 4W 15 5 R006 007 8230 1382 20 carbon 1 4W 220 5 R125 425 8230 1381 53 carbon 1 4W 15 5 R008 8230 1387 51 carbon 1 4W 7500 5 R129 429 8230 1386 22 carbon 1 4W 6 2 5 R010 8230 0510 06 array 1 8W 47 47 5 R130 430 8230 1381 03 carbon 1 4W 10 5 5 R131 431 8230 1381 01 carbon 1 4W 1000 5 R011 8230 0361 03 array 1 8W 10 x 4 5 R132 432 8230 1381 09 HT carbon 1 4W 10 5 R012 8230 0361 03 array 1 8W 10 x 4 5 133 433 8231 5032 24 PIT carbon 220 637T R013 014 8230 138479 HT carbon 1 4W 4 70 5 R134 434 8230 138222 carbon 1 4W 2 2
17. ALU 16V 10 20 SME 12 5 109 409 8232 1431 06 ALU 16V 10 20 SME 101 201 110 410 Wire jumper IPS 1041 2 F5 C102 202 N A 111 411 1 Wire jumper 5 1041 2 F5 C112 412 N A E002 Wire jumper IPS 1041 4 F10 C113 413 8232 1431 06 ALU 16V 10IIL 20 SME J001 8245171103 Connector LI jack 8283 3P 114 414 8232 1431 06 ALU 16V 10uF 20 SME J002 8245 171203 Connector jack 8283 3P RED 115 415 8232 1431 06 ALU 16V 10uF 20 SME J003 8245 171303 Connector jack 8283 BLK C150 250 8232 8012 21 CER 50V 220 5 SL 1005 8245 298000 Connector PL jack phone C151 251 8232 8012 20 CER 50V 22pF 5 SL LGR4609 7000 C152 252 8232 1431 06 ALU 16V 10uF 20 SME 1006 8245 298000 Connector PL jack phone 153 253 8232 801221 50 220pF 5 51 LGR4609 7000 C154 254 8232801220 50 22pF 5 SL 7101 201 8245339004 Connector PL Jack phone 155 255 8232 1431 06 ALU 16V 10uF 20 SME YKB21 5074 C156 256 8232 1424 77 VT ALU 10V 470uF 20 SME J102 202 8245 2680 04 Connector PL jack XLR31 NC3FAHR10 MISCELLANEOUS W004 8276908220 Cahble flat 2P L200 Ref No Part No Description Y901 8207 0122 02 Holder cable 2P 51048 E001 Wire jumper IPS 1041 2 F5 E002 Wire jumper IPS 1041 4 F10 1004 8245 212001 Connector PL jack 2P BLK R P PCB J007 8245 5280
18. APE OUT 1 415 10 dBV 0 3 V 5 Release the PAUSE button and start recording the signal 6 After recording a certain length rewind the tape to the start point of recording section Then playback the tape and check the level at TAPE OUT 1 4 If the AC volt meter reading is not within 10 dBV 0 3 V 0 5 dB adjust the pot R121 421 22 on the R P PCB assy 11 X 24 3 13 Overall Frequency Response Adjustment 1 Set the controls under the same condition as 3 12 except the DOLB Y switch The switch should be turned on 2 Apply a 400 Hz 35 dB V 18 mV signal to the INPUT 1 and 2 phone jacks 3 Record the signal rewind and playback the recorded section of the tape and memorize the output level at TAPE OUT 1 4 4 Next apply 6 kHz amp 12 kHz 35 dB V 18 mV signals to the INPUT 1 and 2 phone jacks 5 Record the signal rewind and playback the recorded section of the tape 6 Check if the 6 KHz 12 kHz output level at OUT 1 4 is within 2 dB comparing to the 400 Hz output level If the AC volt meter reading is not within the above specification adjust the pot R133 433 220 on the R P AMP PCB assy so that the recording level at 6 kHz will be within the specification 3 14 T H D Measurement 1 Connect a distortion meter 400 Hz HPF and 30 kHz LPF to OUT 1 4 and set the controls under the same condition as 3 12 2 Record a 1 kHz 10 dBV 0 3 V sine wave signal 3 Playback the rec
19. a uso 3 No2 AND BGND 3 E 22010 T mI TER mn 3 SES 3 2 25 ri mi 2 rm Bios fX Ra D 2 OSC LEVEL FA 8234 Waa 22k RE T 2 osc LEVEL 3 22 7480 2 osc LEVEL osc LEVEL Divec c y Pios Bas CURR Drona mao 2 BIAS ADU CURR prenan r7 TK 2 R BRS ADT 26 RAN 18 CURA romani vana 2 877 p BRS ADT 080 867 10 CURA BRS ADT caas POWER SW REGULATOR PCB 8 1 crea tv BLOCK DIAGRAM LINE OUT 10dBV LINE ININSERT AE L A B REC 4 as ol 2 0 TIP RTN INPUT gt R RING SEND FADER 1 T 9 MASTER PB FADER 08 4 Lo LINE IN INSERT Q 822 0
20. aken so that A AIU objects do not fall and liquids are not spilled into the en closure through openings An appliance and cart combination should be moved with 19 Damage requiring Service aN apblianee should beser by qualified service when care Quick stops excessive force and uneven surfaces BA A The power supply cord or the plug has been damaged may cause the appliance and cart combination to over gt gt turn 7 Wall or Ceiling Mounting The appliance should be B Objects have fallen or liquid has been spilled into the mounted to 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 D The 900800 2 to operate normally or m cs exhibits a marked changed in performance or 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 90 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
21. ape for Wow amp Flutter measurement is recommended 231 P N 8266002000 TCW 284F P N 8266003000 C 90 or shorter tape TYPE II HIGH position General type General type General type Stereo type is recommended General type General type General type General type X 24 3 3 Tape Transport Mechanical Data 3 3 1 Reel torque 1 PLAY mode 2111 Supply 1 5 6 g cm Takeup 20 70 g cm 2 FF REW mode TW 2231 FF REW 60 120 g cm 3 3 2 Pinch roller pressure Pull force 300 500g 3 4 Tape Travel Check and Adjustment Using the mirror type cassette check to see that the tape is running stable between the ERASE and REC PLAY heads tape guides without weaving If the tape is not running stable between the guides erasure and frequency response will be affected or the tape will be damaged by curling It then becomes necessary to check the guide height perpendicularity of the head surface and alignment of the pinch roller in relation to the capstan In addition to the mirror type cassette the Head Height and Tape Contact Jig is required To check the head guide height the cassette tape is removed and the above jig is placed on the head mount base plate While firmly seating the jig on the base plate surface slide the jig past each head guide to see that it goes through without hitting them Also check perpendicularity of each head surface using the rear check bar of the jig If the guide is low insert t
22. art No Description Ref No Part No Description 1 8259 0500 00 Head erase X 14 24 13 8223 2770 00 Shaft button 2 8259 0520 00 Head R P 4T N LRAARSOT 24 14 8216 5310 00 Belt main 3 8260 4620 00 Pinch roller assy 15 8216 5320 00 Belt sub 4 8260 4630 00 Idler arm assy 16 8216 5330 00 Belt counter 5 8260 4640 00 wheel assy 17 8221 197000 Bracket button 6 8260 465000 Motor assy 18 8256 169000 Counter 7 8260 4660 00 arm assy 19 8214 3550 00 Spring pinch arm 8 8212 4930 00 Lever REC safety 20 8214 3560 00 Spring FR torsion 9 8212 4910 00 Gear arm 21 8214 3570 00 Spring stop pause 10 8212 4920 00 Gear FF 22 8214 3580 00 Spring safety sensor 11 8253 4280 00 SW leaf 5 1541 23 8214 3590 00 Spring rec lever 12 8253 4290 00 SW leaf MSW 1716CV 24 8214 3600 00 Spring play lever 14 X 24 BBT 3x8 CZn 9 BBT 3x8 CZn 8 X 24 OVERALL EXPLODED VIEW BBT 3x12 BZn B BBT 3x8 CZn 9 BBT 3x8 CZn c5 BBT 3x8 CZn 15 X 24 TRANSPORT EXPLODED VIEW 2 7 36 2 2 3 N 9 N o 24 PCB PATTERN DRAWING 124 2 H A x 0 zum al 21195 86 12 J EN 5 7 dio Bes 8 1 8 75 FA 5 gt 22 Ka ES 0 15 1 2 TEN
23. ch OFF Dolby B noise reduction on off switch OFF 2 Connect an AC volt meter to the TAPE OUT 1 through 4 pin jacks 10 X 24 3 Playback the TCW 231 test tape and check the output level if it is 10 dBV 0 3 V 1 dB reading 4 If the reading is not within the above range adjust R106 R406 on the R P AMP PCB assy 3 9 Playback Frequency Response Calibration 1 Set the controls as follows Record track select switch OFF Dolby B noise reduction on off switch OFF 2 Connect an AC volt meter to the TAPE OUT 1 through 4 pin jacks respectively 3 Playback the TCW 284F test tape and adjust R103 R403 so that the output level at 6 3 kHz is 0 5 dB lower than the 400 Hz output level 4 Confirm that the output level at 12 5 kHz 16 within 1 dB of the 400 Hz output level 3 10 Erase Current Adjustment At adjusting the erase current put a blank cassette tape to the transport and the track to be adjusted is put in REC mode Assuming the track 1 to be adjusted the oscilloscope probe is connected to the test point TP106 on the R P PCB assy and rotate and fix the core T101 for minimum voltage point Then confirm that the voltage at TP105 is more than 55 mV NOTE If the voltage at TP106 is adjusted at minimum the erase current flowing the erase head is set to the maximum Adjust the remaining tracks in the same way Track 2 Adjust T201 for minimum voltage at TP206 Then confirm that the voltage at TP205 is more than 55 mV Track 3 Adjust
24. e leakage level when adjacent track is put into REC mode 25 dBV or less Input signal 1 KHz 10 dBV 10 dBV or less Input signal peak frequency 10 dBV Measure leakage level when adjacent track is put into REC mode 35 dBV or less No LED meter is lit Standard fader position Measure leakage level at TAPE OUT when unit is put into REC mode 30 dBV p p or less 20 dB Vp p or less 20 dB Vp p or less 30 dB Vp p or less at PLAY 30 dBVp p or less Measure playback noise level when one side of appliance is dropped 3 times from 5 cm height Specifications and appearance are subject to change without notice for product improvement X 24 2 CONTROLS INDICATORS amp CONNECTORS lt Top Panel gt N O Q 1 2X5 4 6 8 9 NP DG 6 17 E 1 2 3 4 L R OFF ON STANDBY ON 9 4 LINE ININSERT LINE OUT RESET O 000 MASTER WIDE PITCH PAN INPUT PLAYBACK LEVEL REC SEL 10 5 0 3 6 L R _ REC SEL 10 5 0 3 LR _ REC SEL 40 5 0 3 6 lt L 8 SS REC SEL 40 5 0 3 6 C EU 9 POWER A
25. he required amount of 0 1 mm or 0 2 mm thick washers under the head mounting legs or vice versa if it is high NOTE Always adjust the head azimuth and phase when the head height is adjusted 3 5 Volume amp SW setting Input fader At 8 I position Master fader At 8 1 position Pan Fully CCW L or CW R position 3 6 Check and Adjusting of Head Azimuth 1 Switch off the DOLBY SW 2 Connect an AC volt meter to the TAPE OUT and playback the 12 5 kHz section on the TC 284W test tape 3 Rotate the REC PLA Y head azimuth adjusting screw to obtain a maximum output level 3 7 Tape Speed Check and Adjustment 1 Confirm that the Pitch control knob is at center position 2 Connect a frequency counter or wow amp flutter meter with frequency counter to the TAPE OUT and playback the Model 9152 test tape 3 Check the tape speed and wow amp flutter if they satisfy the following specifications Tape Speed 3000 Hz 30 Hz at both beginning of tape and EOT end of tape positions Wow amp Flutter 0 25 CCIR WTD at both BOT and EOT positions 4 If the speed 18 not within the above specification adjust R43 3 3 on the AMP PCB assy 5 Next check if the tape speed variable range satisfies the specifications below Maximum tape speed 12 or more 3360 Hz or more Minimum tape speed 45 or less 1650 Hz or less 3 8 Playback Level Calibration 1 Set the controls as follows Record track select swit
26. ing 1 Head With constant use the head surface becomes soiled with magnetic particles from the tape dirt and dust Under such conditions the tape will not always be in smooth contact with the head and thus result in poor performance Less X 24 output in the high region and dropout some parts of sound not reproduced are typical symptoms It is therefore recommended to clean the heads periodically before recording and playback to avoid such troubles 2 Capstan and pinch roller Buildup of magnetic particles and dust on these parts will cause increase in wow flutter and wrapping of tape on the capstan Thus these parts must always be kept clean Cleaning is done with cotton buds moistened with fluids prescribed or recommended for tape recorders and especially the heads Never use lacquer thinner acetone or other organic solvents 3 1 2 Demagnetizing The REC PLAY head becomes magnetized by extended use or when the head is touched with a magnetized object As a result frequency response especially in the high region will deteriorate noise level increases and in some cases may transfer noise to valuable prerecorded tapes For this reason do not touch the head with magnetized screwdriver and scissors or allow DC current to flow through the head winding such as when testing continuity with a circuit tester Should the head becomes magnetized demagnetize it with a head demagnetizer designed for this purpose Demagneti
27. ocedures 2 4 6 Check if the AC volt meter reading is within the following specifications DIN AUDIO 48 dB IHF A 55 dB 3 19 Click Noise Measurement 3 19 1 Dolby switch on off 1 Check if the click noise level at OUT when turning on off the Dolby switch is less than 30 dBV p p 3 19 2 REC STOP monitor 1 Check if the click noise level at TAPE OUT when punching out by pressing the STOP button is less than 20 dB Vp p 3 19 3 REC STOP on tape 1 Turn off the Dolby switch turn on all the 1 4 record track switches and put a blank cassette tape in the transport 2 Plug the foot switch e g Model 8051 in the Punch in out jack and press the PLAY button 3 Press the foot switch repeatedly and check if the click level at TAPE OUT 1 4 is less than 20 dBVp p 13 X 24 3 20 Table of Adjusting Items Adjusting Item Measuring Point Adjusting Point Ref Clause page Tape speed Playback level calibration Erase current adjustment Overall frequency response adjustment TAPE OUT OUT 1 4 4 Playback frequency response calibration OUT 1 106 406 105 405 OUT 1 4 R106 8406 103 8403 1101 401 R133 433 4 EXPLODED VIEW PCB ASSEMBLY AND PARTS LIST X 24 OVERALL EXPLODED VIEW amp PARTS LIST Ref No Part No Description Ref No Part No Description 1 8216
28. on 1 4W 160 5 SLR 332YC TE7 D106 406 8234 1046 01 Opt VT LED RED CAPACITORs SLR 332VC TE7 ALU Electrolytic type D107 407 8234 104601 Opt VT LED RED CER Ceramic type SLR 332VC TE7 Ref No Part No Description C001 002 8232 1424 76 ALU 10V 47uF 20 SME RESISTORs C005 006 8232 1424 76 VT ALU 10V 47uF 20 SME Ref No Part No Description C010 8232 801221 CER 50V 220pF 5 SL R001 007 8230 1387 51 carbon 1 4W 7500 5 C011 8232 8012 20 CER 50V 22pF 5 SL R010 012 8230 138123 carbon 1 4W 12kQ 5 C012 8232801221 VT CER 50V 220pF 596 SL R013 8230 1384 73 carbon 1 4W 47 5 C013 8232 801220 CER 50V 22 5 SL R103 203 8230 138102 carbon 1 4W 1 5 C014 8232 143106 ALU 16V 10UF 20 SME R104 204 8230 1381 02 HT carbon 1 4 1 5 C103 203 8232 1421 07 ALU 10 100uF 20 SME R105 205 8230 138104 carbon 1 4W 100 5 C104 204 8232 1421 07 ALU 10 100 20 SME R106 206 8230 1381 04 HT carbon 1 4W 100 5 C105 205 8232801100 CER 50V 10 5 SL R107 207 8230 1384 73 carbon 1 4W 47 5 C106 206 8232 801100 CER 50V 10pF 5 SL X 24 19 X 24 20 Ref No Part No Description Ref No Part No Description 107 207 8232 1431 06 VT ALU 16V 10 20 SME R102 202 8230 1381 23 Resistor HT carbon 1 4W C108 408 8232 1431 06 VT
29. orded part and check if the distortion level is less than 2 90 3 15 Erasure Measurement 1 Connect a 1 KHz bandpass filter and AC volt meter to TAPE OUT 1 4 and set the controls under the same condition as 3 12 2 Record a 1 KHz 0 dBV 1 V sine wave signal which is 10 dB higher than the reference recording level on a blank tape 3 Rewind the tape to the start point of recording and advance it by a short length Then record again without applying the signal on the remaining part 4 Rewind the tape to the start point again and play it back Check if the level ratio between the playback level and no signal section erased part is 67 dB or more 3 16 Cross Erasure Measurement 1 Set the controls as follow Trim knob At minimum Input fader Standard position At 8 1 Dolby B noise reduction on off switch OFF 2 Input a 100 kHz 10 dBV signal to the INPUT 1 and 2 phone jacks and record the signal on all tracks 3 Rewind the tape to the start point of recording Then erase the 10 kHz signal on the track and check if the level difference at the corresponding track indicated below is within 1 dB Tracks to be measured Track s to be erased 1 2 2 1 and 3 3 2 and 4 4 3 4 If the level goes down more than 1 dB check the running path again 12 X 24 3 17 Sync crosstalk measurement Sync crosstalk is a relative figure against the reference level on how much of the recording signal from a track in recording
30. r 108 408 8232901392 VT PES 50 0 0039UF 5 AMZ 101 401 8276 001000 Pin header 109 409 8232146105 ALU 50V 1 20 SME TP104 4048276 0010 00 Pin header 110 410 8232 1461 05 ALU 50V 1 20 SME 105 405 8276 0010 00 Pin header 112 412 8232146475 ALU 50V 4 7uF 20 SME 106 406 8276 0010 00 Pin header 113 413 8232146224 ALU 50V 0 228 20 SME 8242 1250 00 Transformer osc main 80kHz 114 414 8232 142476 VT ALU 10V 474F 20 SME 101 401 8242247000 Transformer osc sub 80kHz 115 415 8232 142476 ALU 10V 47 20 SME 001 82763640 07 Cable assy earth lug D3 kink L70 116 416 8232 142476 VT ALU 10V 47uF 209 SME X001 8256 0980 00 Resonator P CER 4MHz EFO 117 417 8232 142476 ALU 10V 47 20 SME 118 418 8232 9012 73 VT PES 50 0 027 5 AMZ 119 419 8232143106 ALU 16V 10uF 20 SME REGULATOR C120 420 N A 121 421 8232 146104 ALU 50V 0 1uF 20 Ref Part No Description 122 422 8232 801181 50 180pF 5 SL Regulator X 24 123 423 8232 901182 PES 50V 0 0018uF 5 AMz 8001 8251 970002 Plain PCB Regulator X 24 C124 424 8232 146225 VT ALU 50V 2 2uF 20 SME C125 425 8232 801221 VT CER 50V 220pF 5 SL Ref No Part No Descripuon 126 426 8233 0481 52 VT PPR 100V 0 0015UF 5 APS U001 8236 0449 10 IC 220 regulator 2
31. r DTC114TK Ref No Part No Description U107 407 8236 5701 03 ST DTC114TK 8274 1340 00 Mixer 24 2 js 8001 8251968102 Plain PCB Jack X 24 head I Ref No Part No Description i TRANSISTORS 101 201 8230 1381 23 Resistor HT carbon 1 4W 065600000 0001 8234 1430 00 25 3071 12 5 X 24 Ref No Part No Description Ref No Part No Description Q002 003 8234504303 VT NPN 2SC1740S S 102 402 8230 1381 04 carbon 1 4W 100 5 Q004 8234 5050 00 VT FET 2SK117 Y GR BL R103 403 8231 503223 PIT carbon 22 637T Q101 401 8234 5043 03 VT NPN 2SC1740S S R105 405 8230 1383 94 carbon 1 4W 390 5 DIODEs R106 406 8231 5034 71 R TRIM PIT carbon 4700 637T Ref No Part No Description R107 407 8230 1383 32 HT carbon 1 4W 3 3 5 D001 8234 0196 02 VT DSK10C BT R108 408 8230 138181 carbon 1 4W 1800 5 2002 Wire jumper IPS 1041 2 F5 R109 409 8230 1382 22 carbon 1 4W 2 2 5 D003 8234 0196 02 VT DSK10C BT 110 410 8230 1383 32 carbon 1 4 3 3 5 D004 005 8234 5007 00 155136 R113 413 8230 1381 83 carbon 1 4W 18 5 D101 401 8234 5007 00 155136 R114 414 8230 1382 03 carbon 1 4W 20 5 D102 402 8234 5007 00 155136 R115 415 8230 1382 03 carbon 1 4W 20 5 D103 403 8234 500
32. rating 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 ommended by the manufacturer E 14 Nonuse Periods The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time 15 Object Liquid Entry Care should be t
33. tions All other servicing should be referred to qualified Service personnel TABLE OF CONTENTS 1 SPECIFICATIONS sas RASEN GR RR Res 4 2 CONTROLS INDICATORS AND CONNECTORS 7 3 ADJUSTING PROCEDURES 8 4 EXPLODED VIEW PCB ASSEMBLY AND PARTS LIST 14 5 CIRCUIT amp BLOCK 58 23 NOTES Adjusting Procedures Parts List and circuit diagrams are given in this manual to assist the service technician in maintaining the Model X 24 following accessories are supplied with X 24 as the standard accessories Owner s manual 8288418000 for export amp domestic model AN AC adaptor AD 12A 8270727003 for USA CND 8270727006 for EUR 8270727007 for UK 8270727010 for JPN Following is the packing material for the Model X 24 Carton inner X 24 8228715000 Packing L X 24 8228439001 Packing R X 24 8228439002 CAUTION 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 X 24 X 24 1 SPECIFICATIONS DEFINITION Specification Unit Normal Fader Position Input fader Condition Master fader Condition MIXER SECTION Standard Input MICIN Connector Inputlevel Impedance LINE IN INSERT RCV Connector Inputlevel Impedance Standard Output OUT 1 4 Connector Outp
34. uation Crosstalk PAN Crosstalk Click Noise Power on off Other switching Shock Noise RECORDER SECTION Tape Speed Wow amp Flutter PLAY REC amp PLAY Pitch Control MIN PITCH VR Fully CCW MAX PITCH VR Fully CW Fast Winding Time FF RWD Tape Counter Deviation Standard Level PLAY REC amp PLAY Frequency response PLAY REC amp PLAY X 24 0 05 or less Input 1 KHz 0 dBV signal MIC GAIN LINE LINE OUT 0 dBV 0 2 or less Input 1 KHz 0 dBV signal MIC GAIN LINE PHONES 3 mW 169 70 dB or more at 1 kHz from standard fader position 60 dB or more at 1 kHz Input MIC IN MIC GAIN LINE OUT SEND OUT Measure level at non input channel 42 dB or more at 1 KHz Input MIC IN MIC GAIN LINE OUT LINE OUT Measure level at non input channel 20 dB Vp p or less 30 dB Vp p or less 30 dB Vp p or less Measure noise level when one side of appliance is dropped 3 times from 5 cm height 9 5 cm s 1 5 96 3000 Hz 45 Hz when reproducing TCW 211 test tape 0 25 96 or less TCW 211 test tape ANSI WTD 0 30 96 or less AC 514 test tape ANSI WTD 45 96 or less TCW 211 test tape 12 96 or more TCW 211 test tape 150 20 sec TAPE C 60 0 7 FF from BOT to EOT and then RWD to BOT again 10 1 dB TCW 231 test tape 10 1 dBV AC 514 test tape 1 dB or less of level difference between channels is also required Test tape SCW 977 TCW 284F NR OUT
35. ut level Load impedance LINE OUT L R Connector Output level Load impedance INSERT SEND Connector Output level Load impedance Phones Max Output Level Level Indication Frequency Response MIC IN Input Level 50 dB V MIC IN Input Level 10 dB V LINE IN Input Level 10 dB V N shorted by 150 Q resistor MIC IN MIC GAIN MIO MIC IN MIC GAIN LINE 0 1 Vrms At 8 position LINE IN INSERT 10 dBV 1 kHz Recorder Input Monitor mode REC PAUSE Adjust input fader for 10 dBV at TAPE OUT L R At 8 1 position LINE IN INSERT 10 dBV 1 kHz Recorder Input Monitor mode STOP Adjust master fader for 10 dBV at LINE OUT L R Phone unbalanced XLR balanced 50 10 dBV 10 or more Stereo phone tip 10 dBV 10 kQ or more RCA pin 10 dBV 10 kQ or more RCA pin 10 dBV 10 kQ or more Stereo phone ring 10 dBV 10 kQ or more 20 mW or more 1 kHz 16 Q load 0 dB is indicated by 5 dot LED bargraph meter when input output level is 10 dBV with the above standard input master fader position settings 40 20 kHz 3 dB at LINE OUT 20 20 kHz 3 dB at LINE OUT 50 10 kHz 2 dB at PHONES 10 mW 16 Q 66 dB or more at LINE OUT DIN AUDIO 68 dB or more at LINE OUT IHF A 73 dB or more at LINE OUT DIN AUDIO 75 dB or more at LINE OUT IHF A MIXER SECTION continued Distortion With 400 Hz HPF amp 30 kHz LPF Fader Atten
36. uto EES Sud nne multitracker 24 FOSTEX QE mic IN REC PLAY REW FF STOP PAUSE 0 b 5 14 3 15 Master fader MASTER Input playback level control faders INPUT PLAYBACK LEVEL Pan pot knob PAN Record track select switches REC SEL Record track LED Level meter Pitch control knob WIDE PITCH Tape counter reset button RESET Cassette lid Cassette tray 10 Transport control buttons Play button PLAY Stop button STOP Fast forward button FF Rewind button REW Recording button REC Pause button PAUSE Power LED POWER Record LED REC Auto bounce on off button Auto Bounce Auto bounce LED Trim knob X 24 lt Front Panel gt PUNCH IN OUT PHONES 1 Mic input jacks MIC IN 1 3 2 4 2 Headphone jack PHONES 3 Punch in out jack PUNCH IN OUT Rear Panel TAPE OUT 1 Line out jacks LINE OUT L R 4 Dolby B noise reduction on off switch 2 Line in insert jacks LINE INSERT 1 2 3 4 DOLBY NR 3 Tape out jacks TAPE OUT 1 2 3 4 5 Power switch DN STANDBY 6 DC IN connector DC IN 12V 3 ADJUSTING PROCEDURES 3 1 Routine Maintenance 3 1 1 Clean
37. zing Procedures 1 After turning off the power of Model X 24 open the cassette lid and if a cassette tape is loaded remove and place it far away from the deck 2 Switch on the head demagnetizer while holding it about one meter away from the Model X 24 Then slowly move the head demagnetizer tip to the head and wave the tip up and down several times close to the head surface 3 On completing the above procedures slowly draw the demagnetizer away from the head and switch it off when it is more than one meter away from the head As demagnetizm in the head cannot be seen unlike the soiled head routine demagnetizing is necessary It is recommended to do so at the same time the head is cleaned 3 2 Test Equipment and Adjusting Tools The following tools and equipment are required for adjusting the Model X 24 1 Head height and tape contact adjusting jig 2 Torque meter Cassette torque meter Cassette torque meter 3 Mirror tape cassette 4 Test tape Speed Flutter 3 kHz Reference playback level Playback frequency response 5 Blank tape 6 Audio oscillator 7 Frequency counter 8 Bandpass filter 9 AC voltmeter 10 Oscilloscope 11 Wow amp Flutter meter 12 Distortion meter 13 Frequency counter Model 9001 P N 8286001000 TW 2231 P N 8286008000 0 200 g cm 0 2 8 Oz In TW 2111A P N 8286009000 0 100 g cm 0 1 4 Oz In TCC 902 P N 8286002000 Model 9152 P N 82660022000 Also 3150 Hz test t
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