Front PCB
µ
-com VDD(5V)
normal?
UIC1 pin no. 90,97
Replace RIC1
Main PCB RIC1(BA3950) IN: 38V
Input voltage normal?
Yes
Check the Power PCB;
RF1 (T3.15 AL 250V)
Yes
Front PCB
Does UX1(12MHz)
oscillate ?
FRONT PCB POSNS
voltage normal ?
(pin no. 27 ;5.0V)
Check the Main PCB
RD5,RZD2,RR2,3,4,
RC4
Replace
µ
-com
Yes
Yes
Front PCB
When the power is
ON 'H' displays
at pin no. 47 ?(5V)
Yes
Connect Front PCB and Main PCB.
Check the connector Main PCB.
Wafer JCW2,UCW1
No
No
No
No
No
Samsung Electronics
6-1
6. Troubleshooting
6-1 Amplifier
6-1-1 Power Malfunction
Summary of Contents for MM-28
Page 2: ...ELECTRONICS Samsung Electronics Co Ltd March 1998 Printed in Korea Code no AH68 20188A ...
Page 8: ...TIMER ON OFF TIMER CLOCK Remote Control ...
Page 45: ...Samsung Electronics 9 5 Block Diagrams BA4560 LIC1 MIC1 OPTION ...
Page 56: ...10 PCB Diagrams 10 1 Main Samsung Electronics 10 1 ...
Page 57: ...10 2 Front PCB Diagrams 10 2 Samsung Electronics ...
Page 58: ...10 3 CD PCB Diagrams 10 3 1 Main Samsung Electronics 10 3 ...
Page 59: ...11 Wiring Diagram Samsung Electronics 11 1 ...
Page 61: ...UIC1 LC866232A 12 2 Samsung Electronics Schematic Diagrams 12 2 Front ...