Studiomaster DJX Series User manual

Introduction
The information presented in this manual is intended for competent technical personnel to carry out service and
product support for the DJX series of DJ consoles. We assume that the reader is familiar with the related
electronic theory and audio terminology. And is able carry out servicing. Fault finding and repair of audio
equipment of this type. Service person should also be familiar with audio system. mains earthing and power
requirements. As well as handling precautions.
For information on the configuration, operation and application of DJX series range please refer to DJX series
USER GUIDE.
Service and Technical Support
Under normal condition the DJX series does not require maintenance or internal calibration. Any service work
required should be carried by qualified service person only.
We offer further product support throughout our network of approved dealer and service agents. To help provide
the most efficient service please keep a record of the console serial no. the date and place of purchase to be
quoted in any communication regarding this products
.

Important Safety Instruction- Read First
Read Instruction: Retain this safety and operating instructions for future reference. Adhere to all
warning printed here and on the console
Power sources: Connect the console
to a mains power only of the type described in the Service
manual and marked on the rear panel. The power source must provide a good ground
connection.
Power cord: Use the power cord with sealed mains plug appropriate for your local mains supply as
provided with the console. If the plug does not fit into your outlet consult the
audio plus technical support department for assistance. Route the power cord so that
It not likely to be walked on, stretched or pinched by items placed upon or against it.
Ventilation : Do not obstruct the ventilation slots or position the console where the air flow require
for ventilation is impeded. If the console is to be operated in a rack unit or flight case
ensure that it is constructed to allow adequate ventilation.
Moisture: To reduce the risk of the fire or electric shock do not expose the console to rain or
moisture or use it in damp or wet condition. Do not place container of liquids on it
this might spill into any opening.
Heat : Do not locate the console in a place subject to excessive heat or direct sunlight as this
could be a fire hazard, locate the console away from any equipment which produce
heat such as power supplies, power amplifier and heaters.
Environment: Protect from excessive dirt, heat and vibration when operating and storing. Avoid
tobacco ash, drinks slippage and smoke especially that associated with machines,
Handling: To prevent damage to the controls and cosmetics avoid placing heavy objects on the
control surface, scratching the surface with sharp objects. Or rough handling and
vibration. Protect the controls from the damage during transit. Use adequate packing
if you need to ship the unit.
Servicing: Switch off the equipment and unplug the power cord immediately if it is exposed to
moisture, spilled liquid, object fallen into the opening, the power cord or plug become
damaged, during lightening storms, or if smoke odor or noise is noticed .
Installation: Install the console in accordance with the instruction printed in the User guide do not
connect the output of power amplifier directly to the console use audio connector and
plug only for their intended purpose.

SPECIFICATIONS
INPUT SENSITIVITY: MIC -57.0 dBu
PHONO -43.0 dBu
LINE 0.0 dBu
OUTPUT SENSITIVITY: OUTPUT 0.0dB/10K 
RECORDING 12.0dB/47K 
EQUALIZER: TREBLE LINE ± 12dB/10 KHz
MIC ± 10 dB/10 KHz
MID LINE ± 12 dB/1.5 KHz
MIC ± 10 dB/1.0 KHz
BASS LINE ± 12dB/50 Hz
MIC ± 10 dB/100 Hz
FREQUENCY RANGE: ± 3.0 dB@ 20 Hz-20 KHz
DISTORTION(THD) : 0.05%
SIGNAL –TO – NOISE RATIO (SNR): MIC: -55dB
PHONO: -60dB
LINE: -75 dB
TALKOVER: -60dB
HEADPHONES: 1.5VOLT/400 
POWER SUPPLY: 240Vac @50 Hz
DIMENSIONS: 255 x 342 x62mm
WEIGHT: 1.9 KG.

Gain and Operating Levels
From the User Guide:
SOUND LEVEL SETTING:
Set the VU meter to cue and the select the channel to be set via the CUE SELECT switch. Set the GAIN in such
a way that the level on the VU-meter display about 0dB. Set the tone control as required. If necessary adjust the
GAIN again so that the VU-meter display once again about the 0dB.
MASTER SETTING :
The MASTER control is setting the total output level of both channels and the microphone to the amplifier. If
you want to monitor the output level to the amplifier on LED VU-meter, set the selector switch to MASTER. the
RCA connectors for the connection to the amplifier are located at the rear panel. They are identified as
MASTER. Next to the MASTER output is another stereo RCA connector marked REC for connection of the
output signal to a cassette or tape recorder.
HEADPHONE SECTION:
The head phone section is fitted with 6.3 mm stereo jack that is located on top and on front panel of the unit
chooses the socket which is more convenient.” ONLY CONNECT ONE HEADPHONE” the CUE SELECT
switch allows to choose if you wish to listen to channel 1 or 2 or both via the headphone. The CUE LEVEL
control sets the output level to the headphones. The SPLI/NORM control determines the LEFT/RIGHT split of
the master volume and the CUE volume. EXAMPLE: if the switch is completely set to the left. The master and
the CUE volume are both audible at the same time is set to the right, only the CUE signals is audible.
A final note …….. The human ear is a remarkable organ with the ability to compress or ‘shut down’ when
sound levels become too high. Do not interpret this natural response as a reason to turn the system volume up
further! As the session wears on ear fatigue may set in, and the speaker cones may become
Hot so reducing the effectiveness of the system and listeners to gain nay benefit from increased volume.




SERVICE TOOLS
The tools required to service the DJX series DJ mixer are standard to an electronic service workshop and are
easily obtainable. The following items are necessary for disassembly and service access:
1. Philips #1 and #2 screwdrivers and good quality hand tools
2. A set of short medium bristled artist or horse hair brushes.
3. Methanol alcohol or non –corrosive, non –lubricant solvent.
4. Digital multimeter with 20 KHz Band width.
5. Power supply with 200 watts series lamp on socket, along with a shorting switch for the lamp.
6. 60/40 solder wire.
7. Desoldering wick for removal of solder from PCB (Clean PCB).
8. 25/35 watt solderon soldering iron.
REPLACEMNET OF CROSSFADER
Due to the intensive use of this control. the crossover fader needs replacement after some time. This is very easy
and requires no soldering to remove the two screw on the cross fader via a crosshead screwdriver. Lift off the
control from the mixer and disconnect it. Push the connector on the new cross fader (This can only be done one
way). Insert the cross fader panel back into the mixer and fasten the two screws.

BLOCK DIAGRAM - DJX 300 MK I
Connector type
RCA PHONO pin connector
TRS input connector: Tip= Hot (+), Ring = Cold (-), Sleeve = GND
Input Connection Type Impedance Sensitivity
MIC IN ¼” JACK 2K OHMS -54dBu
Stereo LINE IN PHONO JACK 10K OHMS 775mV RMS (0dBu)
Stereo PHONO IN PHONO JACK 47K OHMS 3.8 mV (-46dBu)
Output Connection Type Impedance Level
MIX Out L, R PHONO JACK 10K OHMS 0dBu (775mv rms)
REC Out L, R PHONO JACK 47 K OHMS 12.0 dBu
HEAD PHONES TRS JACK 400 OHMS 1.5Volt

INSTALLATION
EARTHING
The connection to earth (Ground) in an audio system is important for two reasons:
1. SAFETY – To protect the operator form high voltage electric shock.
2. AUDIO PERFORMANCE – To minimize the effect of earth (Ground) loops which result in audible
hum and buzz, and to shield the audio signals from interference.
For safety it is important that all equipment earths are connected to mains earth so that exposed metal parts are
prevented from carrying high voltage which can injure or even kill the operator, It is recommended that the
system engineer check the continuity of the safety earth from all points in the system including microphone
bodies, turntable chassis, equipment cases and so.
The same earth is also used to shield audio cables from external interference such as the hum field associated
with power transformers, lighting dimmer buzz and computer radiation. Problems arise when the signal sees
more than one path to mains earth. An “earth loop” (Ground Loop) results causing current to flow between the
different earth paths. This condition is usually detected as a mains frequency audible hum or buzz.
To ensure see and trouble-free operation we recommend the following:
¾ Have your mains system checked by a qualified electrician - if the supply earthing is solid to start
with you are less likely to experience problem.
¾ DO not remove the earth connection form the console mains plug - the console is connected to
mains earth through the power cable to ensure your safety. Audio 0v is connected to the console
chassis internally. If problems are encountered with earth loops operate the audio “Ground Lift”
switches on connected equipment accordingly, or disconnect the cable screens at one end, usually at the
destination.
¾ Make sure that turntables are correctly earthed: A chassis earth terminal is provided on the console
rear panel to connect to turntable earth straps.
¾ Deal with ground loops: Should you experience hum or buzz caused by ground loops. Check first
each piece of equipment has its own separate path to ground. if so, operate ground lift switches on
connected equipment in accordance with the instruction manuals. Alternatively disconnect the cable
screen at the destination end only. This breaks the offending loop while still maintaining the signal
shielding down the length of the cable.
¾ Use low impedance source: As such as microphone and live level equipment rated 200 ohms or less to
reduce susceptibility to interference. The console outputs are designed to operate at very low
impedance to minimize interference problem.
¾ Route cables to avoid interference: To avoid interference pickup keep audio cables away from mains
power units and cables, thyristor dimmer units or computer equipment. Where this cannot be avoided,
cross the cables at right minimize interference.
¾ Use good quality cable and connector and check for correct wiring and reliable solder joints. Allows
sufficient cable loop to prevent damage through stretching.

SPARE PARTS ORDER
ORDER NO DESCRIPTION
SMSWTSGS005 Cue Switch Selector DJX-300
SMRESVRS049 Cue level/Master Rotary Control for DJX-300 MK I
SMRESVSS016 Treble/Mid/Bass/Split Ctrl for Mic Ch. DJX-300 MK I
SMTFRTFS027 Transformer of DJX-300 MK I
SMMISSXS050 Top Panel for DJX-300 MK I
SM SWTPS002 On/ off switch for DJX-300 MK I
SMCONSCS008 Microphone Socket for DJX-300 MK I
SMRESVRS050 Mic Level Rotary Control for DJX-300 MK I
SMSWTSGS004 Master/phono line Cue Switch for DJX-300 MK I
SMRESVRS052 Line Gain Control for DJX-300 MK I
CTHRDKBS001 Cue Switch Knob for DJX-300 MK I
SMRESVRS035 Cross Faders for DJX-300 MK I
SMMIXKBS001 Cross fader knob for DJX-300 MK I
SMRESVSS012 Channel Faders for DJX-300 MK I
SMRESVRS051 Treble/Mid/Bass-Stereo Control for Line Channel-DJX-300 MK I
SMMIXPAS064 Main PCB for DJX-300 MK I
SMMIXPAS065 Input Jack PCB for DJX-300 MK I

BLOCK DIAGRAM OF IC USAGE
(THIS IC USED FOR INPUT AND OUTPUT STAGE OF MIXER LIKE MIC, LINE, PHONO INPUT,
MASTER AND BOOTH OUTPUT).
BA 4560 IC
BARGRAPH IC LM339

VOLTAGE CHART
Mains Transformer
Main Input Fuse- 50 mA
Primary = 230 volt Ac
Secondary1= 13.10 Volt AC – 0 – 13.10 Volt AC
DC output Unregulated= 13.46 – 0 – -13.46 Volt
LINE/PHONO INPUT BOARD
IC no.1,2,3,4 are BA 4560.


IC pin no. IC no.1 IC no.2 IC no.3 IC no.4
Pin no. 1








Pin no. 2
   
Pin no. 3
   
Pin no. 4
   
Pin no. 5
   
Pin no. 6








Pin no. 7
   
Pin no. 8
   
MAIN INPUT BOARD
IC pin no. IC no.1 IC no.2 IC no.3 IC no.4 IC no.5 IC no.6 IC no.7 IC no.8
Pin no. 1 0 0 0 0 0 0 0 0
Pin no. 2 0 0 0 0 0 0 0 0
Pin no. 3 0 0 0 0 0 0 0 0
Pin no. 4 -13.56 -13.56 -13.56 -13.56 -13.54 -13.54 -13.49 -13.49
Pin no. 5 0 0 0 0 0 0 0 0
Pin no. 6 0 0 0 0 0 0 0 0
Pin no. 7 0 0 0 0 0 0 0 0
Pin no. 8 13.56 13.56 13.56 13.48 13.46 13.46 13.48 13.49
IC pin no.
IC no.9
IC no.10
IC no.12
IC no.13
IC no.14
IC no.15
IC no.16
Pin no. 1 0 0 0 0 0 0 0
Pin no. 2 0 0 0 0 0 0 0
Pin no. 3 0 0 0 0 0 0 0
Pin no. 4 -13.44 -13.44 -13.44 -13.44 -13.44 -13.44 -13.44
Pin no. 5 0 0 0 0 0 0 0
Pin no. 6 0 0 0 0 0 0 0
Pin no. 7 0 0 0 0 0 0 0
Pin no. 8 13.48 13.44 13.44 13.44 13.43 13.43 13.44

DISPLAY BARGRAPH OF MAIN BORAD IC LM339
IC pin no. IC no.17 IC no.18 IC no.19
Pin no. 1 -13.54 -13.4 -13.54
Pin no. 2 -13.18 -13.44 -13.55
Pin no. 3 13.46 13.46 13.49
Pin no. 4 0.1 0.81 0.27
Pin no. 5 0 0 0
Pin no. 6 0.39 1.22 0.55
Pin no. 7 0 0 0
Pin no. 8 0.15 0 0.38
Pin no. 9 0 0.01 0
Pin no. 10 0.29 1.22 0.1
Pin no. 11 0 0 0
Pin no. 12 -13.45 -13.52 -13.43
Pin no. 13 -13.49 -13.15 -13.08
Pin no. 14 -13.34 -13.54 -13.54

FB12FERITE BEAD10uF/63VC87
+
IC7:B4560-SIL7-6+584FERITE BEADFB1010uF/63VC75
+
IC6:B4560-SIL7-6+584C796.8nFC801.5nFC8122pF
C77100pF
FB9FERITE BEAD
100pFC70
22pFC741.5nFC736.8nFC724560-SILIC6:A481-2+3CON6123MODELAPPD'BYDES' BYPCBNOSheetOfSizeRevFilename:-Date:-Drg.Number:-Title:-Drawn by:-CON7321IC7:A4560-SIL+3-2184
C84100pF
FERITE BEADFB11
100pFC89
22pFC86C9122pF
R56100KR5710KR59910R
R60750KR6151K
R5810KR62100KR6310KR65910R
R66750KR6751K
R6410KR68100KR6910KR71N.F.
R72LINK
R7010KR73100KR7410KR76N.F.
R77LINK
R7510K
10uF/63VC68
+
10uF/63VC69
+
10uF/35VC71
+
10uF/63VC76
+
10uF/35VC78
+
10uF/63VC82
+
10uF/63VC83
+
10uF/63VC88
+
N.F.C90
+
J3:B564LRJ3:A231LR
N.F.C85
+
ShrikantSCHEMATIC OF PHONO IN
LEFTRIGHTRIGHTLEFTGNDGNDPHONO-3(L)PHONO-3(R)LINE-3(L)LINE-3(R)TO FADER PCB CON6TO FADER PCB CON6-50dB I/P-15dB I/P-15dB O/P-15dB O/PDJX-3000006035DM3JACK.S044 60006034-114/08/20003
GNDGNDGND-15V+15VGNDGNDGNDGND-15V+15VGNDGNDGNDGNDGNDGNDGNDGNDGNDGND-15VGNDGNDGNDGND+15V-15VGND+15VABCD4321DCBA1234
MK I

MK I

MK I

MK I

MK I

MK I

FAULT HOW TO REPAIR No power is coming on Please check the input power supply fuse If the power supply fuse found ok Please check the mains transformer If the mains transformer is found ok Please check rectifier circuit and regulator circuits If fader control varied the bargraph is also varied and humming
output.
Please check the input stage IC and output stage may be voltage is appear
While varied the gain control the DC outout varied Please check the DC offset of IC pin no 1 and 7 (IC 3)
While varied EQ control the bargraph also varied Please check the DC off set of pin no 1 and 7 (IC 7) If bargraph is not working Please check the IC 16 may not working so please replace If IC 16 is ok and still the bar graph is not working Please check the R146 (180 ohms) If the R 146 ok and still bargraph LED not glowing Please check the IC 17, 18, 19 (LM339) or the LED May be open, please replace. If DC on output stage Please check the output stage If CUE output stage is not working or humming output Please check or replace IC 4 and IC 5 may be faulty please replace the ic
While the CUE control varied the output get humming Please check or replace IC 46 may be faulty please replace the ic