Fostex X-34 Service manual
Service Manual
Model
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-34
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
25
NOTES
Adjusting Procedures, Parts List and circuit diagrams are given in this manual to assist the service technician in
*
maintaining the Model X-34.
The following accessories are supplied with X-34 as the standard accessories.*
Owner's manual : 8288427000 (for export & domestic model)
AC adaptor AD-12C : 8270846003 (for USA/CND)
!
: 8270846006 (for EUR)
: 8270846007 (for UK)
: 8270846010 (for JPN)
Following is the packing material for the Model X-34.
*
Carton, inner, X-34 : 8228723000
Packing, L, X-34 : 8228448000
Packing, R, X-34 : 8228449000
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-34
1. SPECIFICATIONS
DEFINITION
Specification Unit 0 dBV = 1 Vrms
Normal Fader Position
Input fader At 70 ~ 90 % position
Condition LINE IN / INSERT: -10 dBV / 1 kHz
Recorder: Input Monitor mode (REC - PAUSE)
Adjust input fader for -10 dBV at TAPE OUT.
Master fader At 70 ~ 90 % 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-3 (balanced)
Input level -50 ~ -10 dBV
Impedance 10 kΩ or more
LINE IN / INSERT (RTN)
Connector Stereo phone (tip)
Input level -10 dBV
Impedance 10 kΩ or more
AUX RTN L (MONO) / R
Connector Phone
Input level -20 dBV
Impedance 7 kΩ or more
Standard Output
TAPE OUT 1 ~ 4 / LINE OUT L, R
Connector RCA pin
Output level -10 dBV
Load impedance 10 kΩ or more
MONITOR OUT L, R
Connector Phone
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 5-dot LED meter X 6 (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.)
Mic Gain 40 ± 2 dB
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.)
4
MIXER SECTION (continued)
Frequency Response
MIC IN (Input Level: -50 dBV, Mic
Gain: MIC) 40 ~ 20 kHz ± 3 dB at LINE OUT
MIC IN (Input Level: -10 dBV, Mic
Gain: LINE) 20 ~ 20 kHz ± 3 dB at LINE OUT (Mic Gain: LINE)
MIC IN (Input Level: -10 dBV, Mic
Gain: LINE) 50 ~ 10 kHz ± 2 dB at PHONES (10 mW / 16 Ω) (Mic Gain: LINE)
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)
EQ Variable Range (HI: 10 kHz, LO: 100 Hz)
Boost +12 ± 3 dB
Cut -12 ± 3 dB
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, Output: SEND
PAN Crosstalk 42 dB or more at 1 kHz (Input: MIC IN, Mic Gain: LINE, Output: LINE
Click Noise
Power on / off -20 dBVp-p or less at LINE OUT / MONITOR OUT / AUX SEND
Other switching -30 dBVp-p or less at LINE OUT / MONITOR OUT / AUX SEND
Shock Noise -30 dBVp-p or less (Measure noise level when one side of appliance is
ΩΩ
Ω resistor)
ΩΩ
68 dB or more at LINE OUT (IHF A)
75 dB or more at LINE OUT (IHF A)
OUT. Measure level at non-input channel.)
OUT. Measure level at non-input channel.)
dropped 3 times from 5 cm height.)
X-34
RECORDER SECTION
Tape Speed
NORMAL FIX SW: OFF 9.5 cm/s ± 1.5 % (3000 Hz ± 45 Hz, TCW-211 test tape)
NORMAL FIX SW: ON 4.75 cm/s ± 1.5 % (3000 Hz ± 45 Hz, TCW-111 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 (NR: OUT) -10 ± 1 dB (TCW-231 test tape)
REC & PLAY (NR: OUT) -10 ± 1 dBV (AC-514 test tape)
Level difference between channels 1 dB or less
Frequency response
PLAY Test tape: SCW-977 / TCW-284F (NR: OUT)
+3 dB
-3 dB
400 Hz 12.5 kHz40 Hz
5
X-34
RECORDER SECTION (continued)
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)
6 dB
12.5 kHz
Level Deviation at Ref. Output Level
5 dB
250 Hz
10 kHz
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 (with 400 Hz HPF & 30 kHz LPF)
(REC & PLAY) 2 % or less (Input signal: 1 kHz / standard level, standard fader position,
REC SEL: All track )
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 should not be 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 (No tape is loaded.)
→→
→→
REC
→ STOP
→→
Monitor -20 dBVp-p or less (AC-514 test tape)
PLAY -20 dBVp-p or less (AC-514 test tape)
Punch In / Out -30 dBVp-p or less at PLAY (AC-514 test tape)
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 >
9 10 11 17 21
X-34
RL
LINE OUT
multitracker
RL
WIDE PITCH
+
6
3
–
+
0
NORMAL
FIX
5
-
10
4321
POWERRECNR
RESET
000
22
18, 19, 20
12
23
13
24
X-34
PAUSESTOPFFREC PLAY REW
MONITOR OUT
+
6
3
0
5
-
10
DOLBY B NR
RL
Track
Down
Auto
Bounce
AUX RTN
100
100
RL/MONO
2/41/3
MIC IN
TRIM 2/4TRIM 1/3
EQ HI
0
8
7
6
5
4
3
+-
EQ LO
0
+-
MON MIX/
AUX
100
PAN
RL
1
4
REC TRK
3
2
1
1 2 3 4 MASTER
0
+-
0
+-
100
RL
4
3
2
1
LINE IN/INSERT
0
+-
0
+-
100
RL
4
3
2
1
4
3
2
1
0
+-
0
+-
100
RL
432
AUX SEND
AUX RTN
MONITOR
AUX
MON MIX
REC TRKREC TRKREC TRK
1 2 2515 1416
1. Input/playback level control faders
2. Master fader [MASTER
]
3. Record track select switches [REC TRK
4. Record track indicators
5. Auto Bounce indicators
6. Pan pot knobs [PAN
]
7. Monitor / AUX send level control knobs
[
MON MIX/AUX
]
8. Equalizer control knobs [EQ HI, EQ LO
9. Trim knobs
10. AUX return knob [AUX RTN
11. Monitor master knob [MONITOR
12. AUX indicator [AUX
]
13. MON MIX indicator [MON MIX
]
]
]
14. Track down on / off button [Track Down
15. Track down indicator
16. Auto bounce select button [Auto Bounce
]
17. Level meters
]
18. Dolby B noise reduction indicator [NR
19. Record indicator [REC
20. Power indicator [POWER
]
]
21. Pitch control knob [WIDE PITCH
22. Tape speed control / knob [NORMAL FIX
23. Tape counter / reset button [RESET
]
24. Cassette lid / Cassette tray
]
]
]
]
25. Transport control buttons
Play button [PLAY
Stop button [STOP
Fast forward button [FF
Rewind button [REW
]
Recording button [REC
Pause button [PAUSE
]
]
]
]
]
]
7
X-34
< Front Panel >
112
1. Line in / insert jacks jacks [LINE IN/INSERT 1, 2, 3, 4
2. Headphone jack [PHONES
]
]
< Rear Panel >
5
1. Mic inut jacks [MIC IN 1/3, 2/4
2. AUX send jack [AUX SEND
3. AUX return jacks [AUX RTN (L/MONO, R)
4. Monitor out jacks [MONITOR OUT (L, R)
5. Line out jacks [LINE OUT L, R
6. Tape out jacks [TAPE OUT 1, 2, 3, 4
]
]
]
]
PUNCH
IN/OUT
10
4
]
]
3
DC IN
9
12V
ON STANDBY
DOLBY NR
ON
OFF
7
8
7.
Dolby B noise reduction on / off switch
[
DOLBY NR ON/OFF
8.
Power switch [ON-STANDBY
9.
DC IN connector [DC IN 12V
10. Pinch in / out jack [
12
TAPE OUT
1234
6
]
]
]
PUNCH IN/OUT
3 (COLD
2 (HOT
]
)
)
1 (GND
)
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
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.
8
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.
Demagnetizing Procedures
After turning off the power of Model X-34, open the cassette lid and if a cassette tape is loaded, remove and place
1)
it far away from the deck.
Switch on the head demagnetizer while holding it about one meter away from the Model X-34. Then, slowly move
2)
the head demagnetizer tip to the head and wave the tip up and down several times close to the head surface.
On completing the above procedures, slowly draw the demagnetizer away from the head and switch it off when it
3)
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-34.
1)
Head height and tape contact adjusting jig Model 9001 (P/N: 8286001000)
2)
Torque meter
Cassette torque meter TW-2231 (P/N: 8286008000): 0 ~ 200 g-cm (0 ~ 2.8 Oz-In)
Cassette torque meter TW-2111A (P/N: 8286009000): 0 ~ 100 g-cm (0 ~ 1.4 Oz-In)
3)
Mirror tape cassette TCC-902 (P/N: 8286002000)
4)
Test tape
Speed / Flutter (3 kHz) Model 9152 (P/N: 82660022000)
Also 3150 Hz test tape for Wow & Flutter measurement is
recommended.
Reference playback level TCW-231 (P/N: 8266002000)
Playback frequency response TCW-284F (P/N: 8266003000)
5)
Blank tape C-90 or shorter tape, TYPE II / HIGH position
6)
Audio oscillator General type
7)
Frequency counter General type
8)
Bandpass filter General type
9)
AC voltmeter Stereo type is recommended.
10)
Oscilloscope General type
11)
Wow & Flutter meter General type
12)
Distortion meter General type
13)
Frequency counter General type
X-34
3-3. Tape Transport Mechanical Data
3-3-1. Reel torque
PLAY mode (TW-2111A) Supply: 1.5 ~ 6 g-cm
1)
Takeup: 20 ~ 70 g-cm
FF/REW mode (TW-2231) FF /REW: 60 ~ 120 g-cm
2)
3-3-2. Pinch roller pressure
Pull force 300 ~ 500 g
9
X-34
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 the 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 & SW setting
Input fader At 8 ± 1 position
Master fader At 8 ± 1 position
Pan Fully CCW (L) or CW (R) position
Track Down on / off button At OFF position
Record track select switch INPUT 1→TRACK 1, INPUT 2→TRACK 2, INPUT 3→TRACK 3,
INPUT 4→TRACK 4
3-6. Check and Adjusting of Head Azimuth
Switch off the DOLBY SW.
1)
Connect an AC volt meter to the TAPE OUT and playback the 12.5 kHz section on the TC-284W test tape.
2)
Rotate the REC/PLAY head azimuth adjusting screw to obtain a maximum output level.
3)
3-7. Tape Speed Check and Adjustment
Confirm that the Pitch control knob is at center position.
1)
Connect a frequency counter or wow & flutter meter with frequency counter to the TAPE OUT.
2)
First, adjust the tape speed at LOW. Press the NORMAL FIX button to change the tape speed at LOW and playback
3)
the Model 9152 test tape.
Adjust the tape speed by R49 (470 Ω) on the R/P AMP PCB so that the freuqency counter reading is within 1500
4)
Hz ± 30 Hz.
Press the NORMAL FIX button to change the tape speed at HIGH and playback the Model 9152 test tape.
5)
Adjust the tape speed by R48 (3.3 kΩ) on the R/P AMP PCB so that the freuqency counter reading is within 3000
6)
Hz ± 30 Hz.
Check the tape speed and wow & flutter if they satisfy the following specifications.
Tape Speed: 3000 Hz ± 30 Hz at both BOT (beginning of tape) and EOT (end of tape) positions
Wow & Flutter: 0.25 % (CCIR WTD) at both BOT and EOT positions
If the tape speed is not within the above specification, adjust R43 (3.3 kΩ) on the R/P AMP PCB assy.
7)
Next, check if the tape speed variable range satisfies the specifications below.
8)
Maximum tape speed: +12 % or more (3360 Hz or more)
Minimum tape speed: -45 % or less (1650 Hz or less)
10
3-8. Playback Level Calibration
Set the controls as follows.
1)
Record track select switch: OFF
Dolby B noise reduction on/off switch: OFF
Connect an AC volt meter to the TAPE OUT 1 through 4 pin jacks.
2)
Playback the TCW-231 test tape and check the output level if it is -10 dBV (0.3 V) ± 1 dB reading.
3)
If the reading is not within the above range, adjust R103 ~ R403 on the R/P AMP PCB assy.
4)
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