Fostex X-24 User Manual
Service Manual
Model
X-24
multitracker
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION:
TO PREVENT ELECTRIC SHOCK, MATCH
WIDE BLADE OF PLUG TO WIDE SOLT,
FULLY INSERT.
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 enclosure that may be of sufficient magnitude to
constitute a risk of electric shock to persons.
“WARNING”
“TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.”
SAFETY INSTRUCTIONS
1.
Read instructions - All the safety and operating instructions should be read before the appliance is operated.
2.
Retain instructions - The safety and operating instructions
should be retained for future reference.
3.
Heed warnings - All warnings on the appliance and in the
operating instructions should be adhered to.
4.
Follow instructions - All operating and use instructions
should be followed.
5.
Water and Moisture - The appliance should not be used
near water - for example, near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement, or near a
swimming pool, and the like.
6.
Carts and Stands - The appliance should be used only
with a cart or stand that is recommended by the manufacturer.
An appliance and cart combination should be moved with
care. Quick stops, excessive force, and uneven surfaces
may cause the appliance and cart combination to overturn.
Wall or Ceiling Mounting - The appliance should be
7.
mounted to a wall or ceiling only as recommended by the
manufacturer.
Ventilation - The appliance should be situated so that its
8.
location or position does not interfere with its proper ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block
the ventilation openings; or, placed in a built-in installation, such as a bookcase or cabinet that may impede the
flow of air through the ventilation openings.
ATTENTION:
POUR ÉVITER LES CHOCS ÉLECTRIQUES,
INTRODUIRE LA LAME LA PLUS LARGE DE
LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER
JUSQU' AU FOND.
The exclamation point within an equilateral
triangle is intended to alert the user to the
presence of important operating and maintenance (servicing) instructions in the literature
accompanying the appliance.
Heat - The appliance should be situated away from heat
9.
sources such as radiators, heat registers, stoves, or other
appliances (including amplifiers) that produce heat.
Power Sources - The appliance should be connected to a
10.
power supply only of the type described in the operating
instructions or as marked on the appliance.
Grounding or Polarization - The precautions that should
11.
be taken so that the grounding or polarization means of
an appliance is not defeated.
Power Cord Protection - Power supply cords should be
12.
routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying
particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance.
Cleaning - The appliance should be cleaned only as rec-
13.
ommended by the manufacturer.
Nonuse Periods - The power cord of the appliance should
14.
be unplugged from the outlet when left unused for a long
period of time.
Object and Liquid Entry - Care should be taken so that
15.
objects do not fall and liquids are not spilled into the enclosure through openings.
Damage requiring Service - The appliance should be ser-
16.
viced by qualified service personnel when:
The power supply cord or the plug has been damaged;
A.
or
Objects have fallen, or liquid has been spilled into the
B.
appliance; or
The appliance has been exposed to rain; or
C.
The appliance does not appear to operate normally or
D.
exhibits a marked changed in performance; or
The appliance has been dropped, or the enclosure
E.
damaged.
Servicing - The user should not attempt to service the ap-
17.
pliance beyond that described in the operating instructions. All other servicing should be referred to qualified
service personnel.
TABLE OF CONTENTS
X-24
1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . .
3. ADJUSTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . .
4. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . .
5. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . .
4
7
8
14
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.
The following accessories are supplied with X-24 as the standard accessories.*
Owner's manual : 8288418000 (for export & domestic model)
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.
3
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 (balanced)
Input level -50 ~ -10 dBV
Impedance 10 kΩ or more
LINE IN / INSERT (RCV)
Connector Stereo phone (tip)
Input level -10 dBV
Impedance 10 kΩ or more
Standard Output
TAPE OUT 1 ~ 4
Connector RCA pin
Output level -10 dBV
Load impedance 10 kΩ or more
LINE OUT L, R
Connector RCA pin
Output level -10 dBV
Load impedance 10 kΩ or more
INSERT (SEND)
Connector Stereo phone (ring)
Output level -10 dBV
Load impedance 10 kΩ or more
Phones Max. Output Level 20 mW or more (1 kHz, 16 Ω load)
Level Indication 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.
Frequency Response
MIC IN (Input Level: -50 dBV) 40 ~ 20 kHz ± 3 dB at LINE OUT
MIC IN (Input Level: -10 dBV) 20 ~ 20 kHz ± 3 dB at LINE OUT
LINE IN (Input Level: -10 dBV) 50 ~ 10 kHz ± 2 dB at PHONES (10 mW / 16 Ω)
S / N (shorted by 150
MIC IN (MIC GAIN: MIC) 66 dB or more at LINE OUT (DIN AUDIO)
MIC IN (MIC GAIN: LINE) 73 dB or more at LINE OUT (DIN AUDIO)
ΩΩ
Ω resistor)
ΩΩ
68 dB or more at LINE OUT (IHF A)
75 dB or more at LINE OUT (IHF A)
4
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 / 16Ω.)
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: LINE
OUT. Measure level at non-input channel.)
Click Noise
Power on / off -20 dBVp-p or less
Other switching -30 dBVp-p or less
Shock Noise -30 dBVp-p or less (Measure noise level when one side of appliance is
dropped 3 times from 5 cm height.)
RECORDER SECTION
Tape Speed 9.5 cm/s ± 1.5 % (3000 Hz ± 45 Hz when reproducing TCW-211 test
tape.)
Wow & Flutter
PLAY 0.25 % or less (TCW-211 test tape, ANSI WTD.)
REC & PLAY 0.30 % or less (AC-514 test tape, ANSI WTD.)
Pitch Control
MIN (PITCH VR: Fully CCW) -45 % or less (TCW-211 test tape)
MAX (PITCH VR: Fully CW) +12 % or more (TCW-211 test tape)
Fast Winding Time (FF / RWD) 150 ± 20 sec. (TAPE: C-60)
Tape Counter Deviation 0 ± 7 (FF from BOT to EOT and then RWD to BOT again.)
Standard Level
PLAY -10 ± 1 dB (TCW-231 test tape)
REC & PLAY -10 ± 1 dBV (AC-514 test tape, 1 dB or less of level difference between
channels is also required.)
Frequency response
PLAY Test tape: SCW-977 / TCW-284F (NR: OUT)
X-24
+3 dB
-3 dB
400 Hz 12.5 kHz40 Hz
REC & PLAY Test tape: AC-514 (NR: OUT, recording level: 0 dB)
+3 dB
-3 dB
400 Hz 12.5 kHz40 Hz
Test tape: AC-514 (NR: IN, recording level: -25dB)
5 dB
250 Hz
10 kHz
6 dB
12.5 kHz
5
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: IN, DIN AUDIO)
55 dB or more (NR: IN, IHF-A)
Distortion (REC & PLAY) 2 % or less (Input signal: 1 kHz / standard level, standard fader position,
with 400 Hz HPF & 30 kHz LPF)
Erasure Ratio 67 dB or more at 1 kHz (Input signal: 1 kHz / 0 dBV, standardfader
position, with 1 kHz BPF)
Cross Erasure 1 dB or less (Input signal: 10 kHz / -10 dBV, standard fader position.
Measure level difference when adjacent track is put into REC mode.)
Channel Separation 50 dB or more (Input signal: 1 kHz / -10 dBV, standard fader position,
with 1 kHz BPF. Measure leakage level when adjacent track is put into
REC mode.)
Sync Crosstalk -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.)
Bias Leakage -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.)
Click Noise
→→
PLAY
→ STOP -30 dBVp-p or less
→→
→→
REC
→ STOP
→→
Monitor -20 dBVp-p or less
PLAY -20 dBVp-p or less
Punch In / Out -30 dBVp-p or less at PLAY
Shock Noise -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.
6
2. CONTROLS, INDICATORS & CONNECTORS
< Top Panel >
X-24
MASTER
PAN INPUT/PLAYBACK LEVEL
1
L
R
2
R
L
3
R
L
4
LR
1/3
Auto
Bounce
MIC IN
REC SEL
1
REC SEL
2
REC SEL
3
REC SEL
4
RL4321
LINE OUTLINE IN/INSERT
REHEARSAL
2/4
OFF ON
DOLBY NR
-+
WIDE PITCH
6+305-10
6+305-10
6+305-10
6+305-10
POWERREC
STANDBY
DOLBY B NR
REC REW FF STOP PAUSEPLAY
ON
DC IN
12V
RESET
000
1. Master fader [MASTER
]
2. Input/playback level control faders
[
INPUT/PLAYBACK LEVEL
3. Pan pot knob [PAN
]
]
4. Record track select switches [REC SEL
5. Record track LED
6. Level meter
7. Pitch control knob [WIDE PITCH
8. Tape counter/reset button [RESET
]
]
9. 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
11. Power LED [POWER
12. Record LED [REC
13. Auto bounce on/off button [Auto Bounce
]
]
]
]
]
]
]
]
]
14. Auto bounce LED
15. Trim knob
7
X-24
< Front Panel >
)
2 (HOT
PUNCH
IN/OUTPHONES
)
1 (GND
3 (COLD
)
< Rear Panel >
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
]
]
1. Mic input jacks [MIC IN 1/3, 2/4
2. Headphone jack [PHONES
3. Punch in/out jack [PUNCH IN/OUT
TAPE OUT
1234
]
]
]
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. Cleaning
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
8
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