Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung Audio MAX-DJ750 20050617095258859_DJ750_2Trouble_TM
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2. TroubleShooting
1.Main(Power)
Power Trans PCB FUSE
MAIN PCB NO NO
PPF5,PPF6 Replace PPF5 , PPF6
PC5,PCB Voltage(+/- 21V)
YES
YES Check FUSE PPF1,or PPF2
Check for
1. Check PZD4.
NO NO
POWER-SENSE(5V) Check Main PCB 2. Check Micom Reset and Osc .
at FRONT PCB Micom PC42 Voltage 5V. 3. Replace MICOM (UIC1)
pin #9 of UIC1
YES
YES
Check pattern and Connector Wire
POWER ON LEVEL NO NO
Check 5V in Front PCB
Check for HIGH Voltage
UC16 or MAIN PCB PIC4 REPLACE PIC4 or PR5
(>3.5V) at UIC1; #pin82 or
5.6V
Main Pcb PR9
YES
Check for VFD1,2-53,54
NO Check Main Pcb PC10 (-34V) ,
VFD AC 3.5V, VFD PIN :-
27V PR14,PZD1,PZD2,PZD3
YES
Check for RESET /OSC parts in Front
PCB
:UX2,UQ1
Samsung Electronics 2-1
2.Output
YES
Protection WORK PROTECTION Troubleshooting
NO
DVD PACK NO
DVD PACK WORKING Troubleshooting
WORKING OK
YES
Check Signal at NO Check Signal in DVD NO
Connector ACW2 l on POWER PCB FIC1 INPUT and OUTPUT CHECK
AMP PCB FIC4,FIC2,FIC80
YES PARTS OPEN/SHORT
Check Mute on
Connector ACW2 HIGH
#PIN 2, PIN3, PIN4 MICOM UIC1 :99#PIN
(H:Mute:L: Normal) and MAIN PCB MIC1 : #PIN12 CHECK
LOW
Check NO MUTE Transtor Circuit Check.
AIC1,AIC3,AIC21
AQ30~36,54~56.
#PIN 10,PIN15 Signal
YES
When POWER OFF ,
Check MOSFET Replace AFQ1~8,21~24 No Good
AFQ1~8,21~24 MOSFET
DS,GS,DS Voltage
Replace AIC1,3,21
2-2 Samsung Electronics
3.Protection
NO OUTPUT LEVEL HIGH PROTECTION.
Power On Protection 1.Please Refer Output troubleshooting
2. Speaker terminal short check
YES
When Power Off, NO 1. Replace Not Good MOSFET
Check MOSFET 2. Check and Replace AZD1~8,21~28
AFQ1~8,21~24 3. Check and Replace AR40,80,45,95,240,245
YES
After OPEN Protection sensor port:
MAIN PCB JW172 (JUMPER),
CHECK PROTECTION PORT
MICOM PORT 3#
YES HIGH
CHECK .
Protection ? Replace MICOM IC UIC1
LOW: protection
High : Normal
NO LOW
PROTECTION PATTERN LINE
CHECK
AMP PCB +34V/-34V NO
1. +5V/-5V Check DVD POWER PCB FQ5,DPIC4
and +5V/-5V CHECK
2. +/-34V Check Power Trans PCB RELAY1,2
YES
Replace AMP PCB AIC1,3,21
Samsung Electronics 2-3
4.DVD PACK
YES DVD PACK Signal Voltage +/- 8V Check :DVD
PLAYING OK
POWER PCB : CONNECTOR DPCW1 #PIN7,8
NO
DVD PACK YES 1. FRONT PCB to DVD PACK 18PIN CABLE
5V,3.3V,8V(MOTOR) CHECK
CHECK 2. MICOM UIC1 CHECK
1. DVD POWER DPIC1,2,3 CHECK
2. DVD POWER ON CONTROL PORT Level
Check: CONNECTOR PORT FCW6 #PIN1 and
MICOM UIC1 #PIN 95.
2-4 Samsung Electronics
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