Mystery MDD-7120S Service manual

CONTENTS
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CONTENTS
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DISASSEMBLY INSTRUCTIONS
1.Mounting Box: Slide out the mounting box in parallel.
2.Top cover: Release screw at the back of top cover, and pull
out the cover.
3.Bottom Cover: Turn over the unit to release the screws at the back of bottom cover and one the top surface. Pull out the cover.
4.Disassemble the Panel: Pull out the Front panel. Release the left side and right side screws attached to with the base. Pull the base out of the unit.
5.Disassemble the mechanism deck: There are two screws to lock the mechanism deck at front ,Unscrew both of them. Remove the solder from fixed wires on the main, and remove the deck.
6.Disassemble the key board : Release four screws . Remove the back panel . Then remove the key board.
7.Unscrew the left side bracket and the right side bracket. There are two screw on each side.
8.Disassemble the main board :
9.Unscrew two screw at the leef bracket remove the solder from the Tuner,and main board. Uncrew two screw ar the ANT.Remove the solder from fixed wires. Unscrew two crew at the Heatsink. Remove the main board.
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OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Standard frequency
AM 1000 KHz (600, 1400 KHz) FM 98.0 MHz (90.0, 106.0 MHz)
Signal output
AM 74 dB/uV FM 60 dB/uV
Modulation
AF output level
Power source voltage
AF load impedance
Balance Tone
AM 1 kHz 30% FM mono
1 KHz 22.5KHz
AM/FM
DC 14.4 V (backup voltage is the same as this )
4 ohm pure resistance
Mechanical center
Mechanical center
The signal strength read in this section is voltage on the antenna.
Note : Use an RF generator for the AM band and a sweep
generator for the FM band.
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DECK
DECK
06
ADJUSTMENT
FM IF/RF ADJUSTMENT
Equipment Required
FM IF/RF signal generator Oscilloscope Solid-state voltmeter (SSVM) Frequency counter Regulated DC power supply DC digital voltmeter Distortion meter
FM IF and RF Alignment Using FM Signal Generator
Note : Press the radio power switch to turn on the radio. Signal
generator
output must be kept as low as possible to avoid overload
and clipping.
Setup Generator
Coupling
IF FM RF
signal generator to ANT i/p
RF
Low
High
Signal generator to antenna receptacle
Generator
10.7 MHz sweep output 60 dB/uV
90MHz Int 1 KHz 22.5KHz mod. output 30dB/uV 106MHz Int 1 KHz 22.5 KHz mod. output 30 dB/uV
Display Setting
98.0 Mhz
90 MHz
106 MHz
Indicator Coupling
Connect oscillosc ope
to Ic1 pin 3 & ground
SSVM across speaker
Adjust ment Remarks
T1
-
C3
L1
Adjust so that maximum AF output power and minimum distortion.
Adjust AF output power for maximum
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ADJUSTMENT
AM /RF ADJUSTMENT
Equipment Required
>AM/RF signal generator >Oscilloscope >Solid-state voltmeter (SSVM) >Frequency counter >Regulated DC power supply >DC digital voltmeter >Distortion meter
AM/RF and RF Alignment Using AM Signal Generator
Note : Press the radio power switch to turn on the radio. Signal generator
output must be kept as low as possible to avoid overload and clipping.
Setup
RF Signal
RF
Cont.
Generator Coupling
generator to antenna receptacle
Signal generator to antenna receptacle
Generator
600 KHz Int 1 KHz 30% mod. Output 74 dB/uV
1400 KHz Int 1 KHz 30% mod. 74 dB/uV
Display Setting
600 Khz
1400 Mhz
Indicator Coupling
SSVM across speaker
SSVM across speaker
Adjust ment Remarks
C1
L3
Adjust AF output power for maximum
Adjust AF output power maximum
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TROUBLE SHOOTING
Before going through the check list, check wiring connection.
If any of the problems persist after checklist has been made,
consult your nearest service dealer
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PRINTED CIRCUIT BOARDS
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PRINTED CIRCUIT BOARDS
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PRINTED CIRCUIT BOARDS
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PRINTED CIRCUIT BOARDS
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PRINTED CIRCUIT BOARDS
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WIRING DIAGRAM
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06-102301-2001-0B-N 2301HT-MB(2301HT收音功能+ISO插座)插件组装部分
19-227161-2210 插座 16P2.0MM 弯插(白色) 11-002929-0601 功放IC TB2929AHQ 16-900000-0000 穿线磁珠 FB310 08-010332-1100 电解电容 3300U/16V 105℃ 13*24 08-210471-1000 电解电容 470UF/16V ±20% φ8*7mm 19-227000-2427 插件插座,收音天线插座,型号:TC09-T(DL) 12-115401-0000 普通二极管 IN5401 16-200331-0001 环型扼流圈 330UH (火牛)立式 19-227161-2211 插座16P2.0MM弯插(红色) 19-013000-0004 电源插座 20P大电流插针 带保险丝
21-C20250-0398
21-D61600-0182
电源线 20P配大电流保险座加ISO插(倒车、刹车、小灯 控制、功放控制)(权达) RCA线 16P2.0MM(白色插头)带RCA4 AUX2 AV1 倒车1 SUB1输出头(权达)
06-102301-2001-1G-N 2301HT-MB主板(2301HT收音功能)共用部分(外发)
06-102301-2001
04-024573-0201
PCB PY-2301HT-MB V01双面板FR4 180.2X263.2MM 2拼板 T1.2MM喷锡 铜厚1.5盎司 贴片晶振 24.576MHZ (49S-2PIN 20PF ±20PPM -20℃
~+80℃)(TFX) 04-080000-0200 贴片晶振,8.00MHz HC-49US 20PF/±20PPM 10-0BAV70-0170 贴片三极管 SOT-23 BAV70 10-0BAV99-0170 贴片三极管 SOT-23 BAV99 10-000103-0170 贴片三极管 KRC103S SOT-23 10-000231-0170 贴片三极管 KRC231S S0T-23 10-002301-0570 贴片场效应管STS2301SOT23 10-000772-0180 贴片三极管 B772 SOT-89 PNP
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