Service Manual Model X-24 multitracker
CAUTION: CAUTION TO PREVENT ELECTRIC SHOCK, MATCH RISK OF ELECTRIC SHOCK DO NOT OPEN WIDE BLADE OF PLUG TO WIDE SOLT, 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 CORRESPONDANTE DE LA PRISE ET POUSSER REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. JUSQU' AU FOND.
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 . . . . . . . . . . . . . . . . . . . . . . . .
X-24 1. SPECIFICATIONS DEFINITION Specification Unit Normal Fader Position Input fader Condition Master fader Condition 0 dBV = 1 Vrms At 8 ± 1 position 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) 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.
X-24 MIXER SECTION (continued) Distortion (With 400 Hz HPF & 30 kHz LPF) Fader Attenuation Crosstalk PAN Crosstalk Click Noise Power on / off Other switching Shock Noise 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 / 16Ω.) 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.
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.
X-24 2. CONTROLS, INDICATORS & CONNECTORS < Top Panel > 1 2 3 4 L LINE IN/INSERT R OFF ON STANDBY ON DOLBY NR LINE OUT DC IN 12V RESET - MASTER PAN 000 + WIDE PITCH INPUT/PLAYBACK LEVEL REC SEL -10 5 0 3 6+ -10 5 0 3 6+ -10 5 0 3 6+ -10 5 0 3 6+ 1 1 L R REC SEL 2 2 L R REC SEL 3 3 L R REC SEL 4 4 L R REC Auto Bounce 1/3 MIC IN POWER REHEARSAL DOLBY B NR 2/4 REC 1. Master fader [MASTER] 2. Input/playback level control faders [INPUT/PLAYBACK LEVEL] 3.
X-24 < Front Panel > PHONES PUNCH IN/OUT 2 (HOT) 3 (COLD) 1 (GND) 1. Mic input jacks [MIC IN 1/3, 2/4] 2. Headphone jack [PHONES] 3. Punch in/out jack [PUNCH IN/OUT] < Rear Panel > 4 1. Line out jacks [LINE OUT L, R] 2. Line in/insert jacks [LINE/INSERT 1, 2, 3, 4] 3. Tape out jacks [TAPE OUT 1, 2, 3, 4] TAPE OUT 3 2 1 4. Dolby B noise reduction on/off switch [DOLBY NR ON/OFF] 5. Power switch [ON-STANDBY] 6. DC IN connector [DC IN 12V] 3. ADJUSTING PROCEDURES 3-1. Routine Maintenance 3-1-1.
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.
X-24 3-3. Tape Transport Mechanical Data 3-3-1. Reel torque 1) PLAY mode (TW-2111A) 2) FF/REW mode (TW-2231) Supply: 1.5 ~ 6 g-cm Takeup: 20 ~ 70 g-cm 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.
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.
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.
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).
X-24 3-20. Table of Adjusting Items Adjusting Item Tape speed Playback level calibration Playback frequency response calibration Erase current adjustment Coarse bias adjustment Record level calibration Overall frequency response adjustment Measuring Point TAPE OUT TAPE OUT 1 ~ 4 TAPE OUT 1 ~ 4 TP106 ~ TP406 TP105 ~ TP405 TP104 ~ 404 TAPE OUT 1 ~ 4 TAPE OUT 1 ~ 4 Adjusting Point R43 (R/P) R106 ~ R406 (R/P) R103 ~ R403 (R/P) T101 ~ 401 (R/P) R133 ~ 433 R121 ~ 421 R133 ~ 433 Ref.
X-24 X-24 OVERALL EXPLODED VIEW 1 2 5 6 BBT 3x8 CZn 4 8 7 9 17 3 18 10 19 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 BBT 3x8 CZn 14 16 26 31 29 15 BBT 3x8 CZn BBT 3x12 BZn 15
X-24 16 X-24 TRANSPORT EXPLODED VIEW
X-24 • MIXER / JACK PCBs X-24 PCB PATTERN DRAWING 17
X-24 18 • R/P / REGULATOR PCBs
X-24 X-24 Parts List • MIXER PCB Ref. No. Part No. Description PCB assy, Mixer, X-24 Plain PCB, Mixer, X-24 Ref. No. Part No. Description R108~408 8230 1384 32 R109~409 8230 1383 03 HT, carbon, 1/4W, 4.
X-24 Ref. No. Part No. Description Part No.
X-24 Ref. No. Part No. Q002, 003 8234 5043 03 Description VT, NPN, 2SC1740S, S Ref. No. Part No. R102~402 8230 1381 04 Description HT, carbon, 1/4W, 100kΩ, 5% Q004 8234 5050 00 Q101~401 8234 5043 03 VT, FET, 2SK117, Y/GR/BL VT, NPN, 2SC1740S, S R103~403 8231 5032 23 R105~405 8230 1383 94 R-TRIM, PIT, carbon, 22kΩ, 637T HT, carbon, 1/4W, 390kΩ, 5% R106~406 8231 5034 71 R107~407 8230 1383 32 R-TRIM, PIT, carbon, 470Ω, 637T HT, carbon, 1/4W, 3.
X-24 Ref. No. Part No. C053, 054 8232 9014 72 Description VT, PES, 50V, 0.0047µF, 5%, AMZ Ref. No. J301 Part No.
J404 AGND +VCC -VCC HGND H+VCC H-VCC INPUT IMP 14Kohm LINE IN4 -10dBV J304 INPUT IMP 14Kohm LINE IN3 -10dBV J204 INPUT IMP 14Kohm LINE IN2 -10dBV J104 INPUT IMP 14Kohm LINE IN1 -10dBV INPUT IMP MIC :12Kohm LINE:22Kohm INPUT MIC 2/4 (BALANCE) -10dBV <> -50dBV INPUT IMP MIC :12Kohm LINE:22Kohm INPUT MIC 1/3 (BALANCE) -10dBV <> -50dBV 1 2 3 4 5 6 W5 3 3 H-VCC HGND H+VCC R408 4.3K R308 4.3K R208 4.3K R108 4.
X-24 24 R/P / REGULATOR PCBs TAPE OUT -10dBV TRK4 TRK3 TRK2 TRK1 RRRR EEEEPPPP CCCCBBBB 4 3 2 1 1 2 3 4 R/P PCB REP EQ TP101 C102 1/50 C107 2.2/50 5 3 C101 560P 6 R102 100K R101 24K 1 0.0082(PP) 2 4 7 8 1 R103 22KB 1 1 4 1 6 3 R110 3.3K 5 R108 180 1 1 1 2 1 3 R113 18K 2 REP EQ 2 U104 DTC114TK 3 C106 47/10 7 3.3K R207 3.3K R107 3.3K +VCC 1 0 2 J7 8 7 6 5 4 3 2 1 J4 1 2 7 8 R131 100 C114 47/10 C117 47/10 R117 2K C115 47/10 C119 10/16 R122 6.
BLOCK DIAGRAM LINE OUT -10dBV LINE IN/INSERT -10dBV 1 INPUT FADER TIP: RTN RING: SEND LINE IN/INSERT -10dBV -10dBV -10dBV REC A. B REC PB REC TRK 2 1 PAN INPUT FADER 2 3 REC TRK 3 REC A. B REC PB 4 PAN TAPE OUT -10dBV INPUT FADER TIP: RTN RING: SEND PHONES OUT BARGRAPH REC A. B REC PB REC A. B REC PB 4 MASTER FADER 16 ohm 20mW REC A. B REC PB 3 L R PAN INPUT FADER TIP: RTN RING: SEND LINE IN/INSERT REC TRK 1 REC A.
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