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Service Manual
Model
X-24
multitracker
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CAUTION: CAUTION TO PREVENT ELECTRIC SHOCK, MATCH RISK OF ELECTRIC SHOCK WIDE BLADE OF PLUG TO WIDE SOLT, DO NOT OPEN FULLY INSERT. ATTENTION: CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, POUR ÉVITER LES CHOCS ÉLECTRIQUES, DO NOT REMOVE COVER (OR BACK). INTRODUIRE LA LAME LA PLUS LARGE DE NO USER-SERVICEABLE PARTS INSIDE. LA FICHE DANS LA BORNE CORRE- SPONDANTE DE LA PRISE ET POUSSER REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. JUSQU' AU FOND. The lightening flash with arrowhead symbol, The
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X-24 TABLE OF CONTENTS 1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . . 7 3. ADJUSTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . 8 4. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . . 14 5. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . 23 NOTES * Adjusting Procedures, Parts List and circuit diagrams are given in this manual to assist t
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X-24 1. SPECIFICATIONS DEFINITION Specification Unit 0 dBV = 1 Vrms Normal Fader Position Input fader At 8 ± 1 position Condition LINE IN / INSERT: -10 dBV / 1 kHz Recorder: Input Monitor mode (REC - PAUSE) Adjust input fader for -10 dBV at TAPE OUT. PAN: L (R) Master fader At 8 ± 1 position Condition LINE IN / INSERT: -10 dBV / 1 kHz Recorder: Input Monitor mode (STOP) Adjust master fader for -10 dBV at LINE OUT. PAN: L (R) MIXER SECTION Standard Input MIC IN Connector Phone (unbalanced) / XLR
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X-24 MIXER SECTION (continued) Distortion (With 400 Hz HPF & 30 kHz LPF) 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 / 16W .) Fader Attenuation 70 dB or more at 1 kHz (from standard fader position) Crosstalk 60 dB or more at 1 kHz (Input: MIC IN, MIC GAIN: LINE, OUT: SEND OUT. Measure level at non-input channel.) PAN Crosstalk 42 dB or more at 1 kHz (Input: MIC IN, MIC GAIN: LINE, OUT: LIN
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X-24 RECORDER SECTION (continued) Level Deviation at Reference Output Level PLAY 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) REC & PLAY 1 dB or less at 400 Hz (NR: OUT, AC-514 test tape) 2 dB or less at 100 Hz ~ 10 kHz (NR: OUT, AC-514 test tape) S/N PLAY 47 dB or more (NR: OUT, DIN AUDIO) 55 dB or more (NR: OUT, IHF-A) REC & PLAY 45 dB or more (NR: OUT, DIN AUDIO) 48 dB or more (NR: OUT, IHF-A) 48 dB or more (NR: I
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1/3 X-24 2. CONTROLS, INDICATORS & CONNECTORS < Top Panel > 1 2 3 4 L R OFF ON STANDBY ON DC IN DOLBY NR 12V LINE IN/INSERT LINE OUT RESET 00 0 -+ MASTER WIDE PITCH PAN INPUT/PLAYBACK LEVEL REC SEL -10 5 0 3 6+ 1 1 L R REC SEL -10 5 0 3 6+ 2 2 L R -10 5 0 3 6+ REC SEL 3 3 L R REC SEL -10 5 0 3 6+ 4 4 LR REC POWER Auto REHEARSAL Bounce DOLBY B NR MIC IN REC PLAY REW FF STOP PAUSE [ ] 1. Master fader MASTER 10.Transport control buttons [ ] 2. Input/playback level control faders Play button PLAY [
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X-24 < Front Panel > PUNCH PHONES IN/OUT ( ) 2 HOT ( ) [ ] 3 COLD 1. Mic input jacks MIC IN 1/3, 2/4 [ ] 2. Headphone jack PHONES [ ] 3. Punch in/out jack PUNCH IN/OUT 1 (GND) < Rear Panel > TAPE OUT 4 3 2 1 [ ] 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 ON/OFF [ ] [ ] 3. Tape out jacks TAPE OUT 1, 2, 3, 4 5. Power switch ON-STANDBY [ ] 6. DC IN connector DC IN 12V 3. ADJUSTING PROCEDURES 3-1. Routine M
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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 fo
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X-24 3-3. Tape Transport Mechanical Data 3-3-1. Reel torque 1) PLAY mode (TW-2111A) 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 ~ 500 g 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
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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 th
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X-24 3-13. Overall Frequency Response Adjustment 1) Set the controls under the same condition as 3.12 except the DOLBY switch. (The switch should be turned on.) 2) Apply a 400 Hz, -35 dBV (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 & 12 kHz, -35 dBV (18 mV) signals to the INPUT 1 and 2 phone jacks. 5) Record the signal, rewind and playback the reco
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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 mode is 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 t
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X-24 3-20. Table of Adjusting Items Adjusting Item Measuring Point Adjusting Point Ref. Clause (page) Tape speed TAPE OUT R43 (R/P) 3-7 (P10) Playback level calibration TAPE OUT 1 ~ 4 R106 ~ R406 (R/P) 3-8 (P10 ~ 11) Playback frequency response calibration TAPE OUT 1 ~ 4 R103 ~ R403 (R/P) 3-9 (P11) TP106 ~ TP406 T101 ~ 401 (R/P) Erase current adjustment 3-10 (P11) TP105 ~ TP405 Coarse bias adjustment TP104 ~ 404 R133 ~ 433 3-11 (P11) Record level calibration TAPE OUT 1 ~ 4 R121 ~ 421 3-12 (P11)
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X-24 X-24 OVERALL EXPLODED VIEW 1 2 5 6 BBT 3x8 CZn 4 8 7 9 17 3 18 19 10 20 21 22 23 BBT 3x8 CZn 11 BBT 3x8 CZn 32 30 BBT 3x8 CZn 28 BBT 3x8 CZn 13 12 BBT 3x8 CZn 24 27 33 BBT 3x8 CZn BBT 3x8 CZn 25 16 BBT 26 3x8 CZn 31 14 29 15 BBT 3x8 CZn BBT 3x12 BZn 15
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X-24 16 X-24 TRANSPORT EXPLODED VIEW
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X-24 X-24 PCB PATTERN DRAWING 17 • MIXER / JACK PCBs
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X-24 18 • R/P / REGULATOR PCBs
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X-24 X-24 Parts List • MIXER PCB Ref. No. Part No. Description Ref. No. Part No. Description 8274 1330 00 PCB assy, Mixer, X-24 R108~408 8230 1384 32 HT, carbon, 1/4W, 4.3kW , 5% B001 8251 9680 01 Plain PCB, Mixer, X-24 R109~409 8230 1383 03 HT, carbon, 1/4W, 30kW , 5% R110~410 8230 1384 73 HT, carbon, 1/4W, 47kW , 5% ICs R111~411 8230 1381 23 HT, carbon, 1/4W, 12kW , 5% Ref. No. Part No. Description R112~412 8230 1381 04 HT, carbon, 1/4W, 100kW , 5% U001 8236 5405 00 ST, analog, NJM2068M R
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X-24 Ref. No. Part No. Description Ref. No. Part No. Description C107, 207 8232 1431 06 VT, ALU, 16V, 10m F, 20%, SME R102, 202 8230 1381 23 Resistor, HT, carbon, 1/4W, C108~408 8232 1431 06 VT, ALU, 16V, 10m F, 20%, SME 12kW , 5% C109~409 8232 1431 06 VT, ALU, 16V, 10m F, 20%, SME C101, 201 N/A C110~410 Wire, jumper, IPS-1041-2, F5 C102, 202 N/A C111~411 N/A E001 Wire, jumper, IPS-1041-2, F5 C112~412 N/A E002 Wire, jumper, IPS-1041-4, F10 C113~413 8232 1431 06 VT, ALU, 16V, 10m F, 20%, SME J001
