Zonda MZ-X20 User manual

Service Manual
Model MZ-X20

MZ-X20
1
INDEX
1. GENERAL.......................................................................................................................................................2
1.1 PRODUCT FRONT VIEW..............................................................................................................................2
1.2 PRODUCT BACK VIEW.................................................................................................................................3
1.3 REMOTE CONTROL.....................................................................................................................................5
2. TECHNICAL SPECIFICATION........................................................................................................................6
3. CALIBRATION GUIDE....................................................................................................................................8
4. MATERIAL LIST............................................................................................................................................10
4.1 PCB FRONTAL/LATERAL/RADIO................................................................................................................10
4.2 PCB TRAFO................................................................................................................................................29
4.3 PCB CD.......................................................................................................................................................29
4.4 PCB DECK..................................................................................................................................................38
4.7 PCB REMOTE CONTROL...........................................................................................................................43
5. ELECTRICAL SCHEMES............................................................................................................................46
5.1 LATERAL PCB / TRAFO.............................................................................................................................47
5.2 FRONTAL PCB...........................................................................................................................................48
5.3 DECK PCB..................................................................................................................................................49
5.4 CD PCB.......................................................................................................................................................50
5.5 REMOTE CONTROL PCB ....................................................................................................................................51
6. SILKTOP (S) / SOLDERS (SL).....................................................................................................................52
6.1 LATERAL PCB - S / SL .............................................................................................................................52
6.2 FRONTAL PCB - S / SL..............................................................................................................................52
6.3 DECK PCB - S / SL.....................................................................................................................................56
6.4 CD PCB - S / SL..........................................................................................................................................58
6.5 REMOTE CONTROL PCB - S / SL..............................................................................................................60
7. EXPLODED VIEW .....................................................................................................................................62
8. SPEAK LOUDERS - TECHNICAL SPECIFICATION ...................................................................................63
8.1 MATERIAL LIST AND EXPLODED VIEW..................................................................................................64

MZ-X20
2
1. GENERAL
1.1 Product front view
a) Front panel
a.1) Frontal panel functions and indications
01 Power 18 << Rew – Deck 2
02 Standby indicator 19 Playback Deck 2
03 CDs compartment 20 Stop/Eject – Deck 1
04 Shuffle 21 << - Rew – Deck 1
05 Display 22 Playback - Deck 1
06 Stop CD 23 Rec – used with
07 Play / pause CD 24 >> - FF– Deck 1
08 Remote control sensor 25 Deck 1 compartment
09 Open/close 26 Equal
10 Volume 27 Skip / Search Up
11 Tuner - Band 28 Skip / Search Down
12 Tape Deck 1-2 29 Mode
13  Pause - Deck 1 30 CD Disc Changer
14 Deck 2 Compartment 31 Repeat
15 Stop/Eject – Deck 2 32
16  - Pause – Deck 2 33
17 >> FF– Deck 2 34

MZ-X20
3
1.2 Product back view
b) Back panel
b.1) Back panel functions and indications
01 Edges for ventilate Left speak load 2 vias – 8Ω
02 Output Right speak load 2 vias - 8Ω
03 FM – Antenna wire 04 AC VOLTAGE 120V
c) Function
Functions CD Carrossel – 3 positions
Tape Double deck
Radio AM / FM - PLL digital – 20 memories
Aux. Input
Display FTD
Clock 24:00h – Timer function ( turn on )
Equalizator Pop, Classic, Dance, Techno ( Pre programmed )
Personal ( For adjustment of the user )
HBass Ajuste de graves - 3 level
Dimensions Product 265X310X325 mm
Speak louders 220X310X297 mm
Weight Product 4,8 Kg
Speak louders 2,7 Kg

MZ-X20
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d) Alimentação:
Unity Nominal Min. Max.
- -
Supply voltage Vac 120 - -
Supply frequency Hz 60 - -
Consumed Power Stand by W- - 6
Max W20 -60
CD Player:
Type of laser 3 beams ( λ= 780 nm)
Reproductivity
Made test Used test disc Used track Conclusion
Interruption TCD 725A - Abex 01 a 04 OK
Black dots TCD 725A - Abex 07 e 08 OK
Fingerprints TCD 725A - Abex 13 OK
Vertical deviation TCD 731RA - Abex 01 a 15 OK
Eccentricity TCD 710A - Abex 01 a 15 OK

MZ-X20
5
1.3 REMOTE CONTROL
e.1) Remote control functions
1Power 15 Stop / Shuffle
2Disc 3 16 Vol. s
3Mode 17 Tunning Down
4Demo / U18 AM
5Clock 19 Tape
6CD 20 Sleep
7Loudness 21 Timer
8FM 22 Memo
9Tunning Up 23 Disc 2
10 Vol.t24 Disc 1
11 Play / Pause CD 25 Mute
12 HBass / PRG 26 Surround
13 Shift
14 Disp / RPT
Supply : 3V – 2 batteries size AA
Reach: 6 metres ( minimum )

MZ-X20
6
2. TECHNICAL SPECIFICATION
POWER
ITEM CONDITION MEASUREMENT UNITY MINIMUM MAXIMUM
1- OUTPUT POWER 10% THD 48 + 48 W-10 + 10
2- DISTORTION 1W + 1W 0,3 %-1
RÁDIO FM
ITEM CONDITION MHz MEASUREMENT UNITY MINIMUM MAXIMUM
1- TUNNING RANGE MINIMUM
MAXIMUM 87,5 108,1 MHz MHz 87,5 108,1 87,5 108,1
2- SENSIVITY 30 dB S/R
90
98
106
dB
dB
dB
22
22
22
3- FREQUENCY RESPONSE
( 1 kHz = 0 ) 100 Hz kHz 98 98 dB dB -3 -10 3 -4
4- AFC PERFORMANCE UP
DOWN 98 98 dB dB 100 100 300 300
5- MONO DISTORTION 1 kHz 98 %3
6- STEREO DISTORTION 1 kHz 98 %5
7- STEREO SEPARATION
with filter of 19 kHz 1kHz esq. 1kHz dir. 98 98 dB dB 20 20
8- SENSIVITY OFF
ON 98 98 dB dB 24 36
DUMMY: DA-V REFERENCE LEVEL: 1W / 8 Ohms AC VOLTAGE : 120Volts
RADIO AM
ITEM CONDITION kHz MEASUREMENT UNITY MINIMUM MAXIMUM
1- TUNNING BAND MÍNIMUM
MAXIMUM kHz kHz 520 1650 520 1650
2- SENSIVITY 20 dB S/R 600 1000
1400
dB
dB
dB
70
70
70
3- SIGNAL / NOISE RELATION
( 400 Hz = 0 dB ) 1000 dB 20
100 dB -3 3
4- FREQUENCY RESPONSE
( 400 Hz = 0 dB ) 3k dB -10 -2
ANTENA LOOP REFERENCE LEVEL : 1W / 8 Ohms AC VOLTAGE: 120 Volts

MZ-X20
7
TAPE PLAYBACK
ITEM CONDITION Hz MEASUREMENT UNITY MINIMUM MAXIMUM
1- WOW & FLUTTER MTT 111 3k %0,3
2- FREQUENCY RESPONSE
( 1 kHz = 0dB )
MTT 117
MTT 117 125 6,3k dB dB -3 -3 3 3
3- SEPARATION MTT 141 1k dB 20
4- TAPE NOISE REC/PLAY
( IN PLAY ) VOL.MIN. VOL.MAX. mV mV 10 100
5- TAPE NOISE PLAY
( IN PLAY ) VOL.MIN. VOL.MAX. mV mV 10 100
REFERENCE LEVEL : 1W / 8 Ohms AC VOLTAGE : 120 Volts
CD
ITEM CONDITION Hz MEASUREMENT UNITY MINIMUM MAXIMUM
1- SINAL / RUÍDO RELATION TNO 24 1k dB 40
2- SEPARAÇÃO
TNO 33/34 1k dB 20
3- FREQUENCY RESPONSE TNO 04 TNO 07
TNO 09
100
1k
10k
dB
dB
db
-3
-3
-3
3
3
3
REFERENCE LEVEL: 1W / 8 Ohms AC VOLTAGE : 120 Volts
EQUALIZATOR
ITEM CONDITION Hz MEASUREMENT UNITY MINIMUM MAXIMUM
1- LOUDNESS Vol. 10 100 dB 12 16
2- H-LOUD 1
H-LOUD 2
H-LOUD 3
Vol.10
Vol.10
Vol.10
100
100
100
dB
dB
dB
-1
0
+1
+1
+3
+5
3- PERSON
( VOL. 10 )
Bass +5
Bass -5
Treb +5
Treb -5
100
100
10k
10k
dB
dB
dB
dB
-6
+6
-6
+6
-10
+10
-10
+10
REFERENCE LEVEL: 1W / 8 Ohms AC VOLTAGE : 120 Volts

MZ-X20
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3. CALIBRATION GUIDE
Obs.: This procedures can be used to orientation , some item can be changed by the factory
engineering for best application and improve the factoring process.
FM RANGE
Tunning in 87,5 MHz, adjust the coil OSC-FM (L.102) to obtain ~ 2,0 V in the tunnig voltage
(terminal 28 of IC101 with resistor of 10K in serie with the voltmeter ).
Tunnig in 108,1 MHz, and verify if the tunnig voltage is ~ 7,1 V.
The voltage values can be slightly changed to help the production.
FI-FM
Connect a FM sweepings generator in the FM input.
Tunning the radio in 98,1 MHz.
Verify the shape of curve “S”, in the pin 23 of the IC101.
TRACKING FM
Connect a FM sweeping generator in the FM input.
The generator output must have a very low RF signal and cannot saturate the IC output (pin 23 of
the IC101 ).
Tunning in 90,1 MHz and adjust the RF-FM coil (L.101) to obtain maximum output signal.
Tunning in 106,1 MHz and adjust VC.102 to obtain maximum output signal.
AM RANGE
Tunning in 520 kHz, adjust the OSC-AM coil (T.101) to obtain ~ 1,0 V in the tunning voltage.
Tunning in 1650 kHz, and verify if the tunning voltage is ~ 6,5 V.
The voltage values can be slightly changed to help the production.
FI-AM
Adjust a AM generator to 1000 kHz with 30% of modulation in 400 Hz.
Tunning the radio in 1000 kHz.
Must be used a very low RF signal.
If haves undesirable noises, this frequency can be displaced for + or -, together with a frequency of
the generator frequency.
Adjust the FI-AM coil (T.104) to obtain the maximum detected signal.
TRACKING-AM
It AM sweeping radiates to a ferrite antenna .
Tunning in 600 kHz and adjust the coil ANT-AM (T.102) to obtain maximum output signal.
Tunning in 1400 kHz and adjust VC.101 to obtain maximum output signal.
Remake the adjust three times to obtain the best adjust point.

MZ-X20
9
COMMENTS
The FM signal generator have be connected in the FM input through of the DUMMY DA-V.
The AM signal generator have be irradiated for a LOOP antenna and captured by itself ferrite
antenna of the device.
As much in the calibration of AM as in the one of FM, the used tool for calibrate the coils have be of
material not magnetic.
45
10
60
( 50 : 75 )
OSC. BIAS
Connect a VTVM in the point TP5 e TP6.
The VTVM output must be linked in a frequencymeter.
Put a tape with the unbroken rec constraint.
Select a AUX function whitout input signal.
Adjust T903 to obtain 59.068 Hz +/- 20Hz in the frequencymeter.
Verify if in the VTVM have a 0,035V signal.