SAMSUNG max670 Troubleshooting
6. Troubleshooting
6-1 The Amp Section
6-1-1 Power Malfunction
Main PCB -com VDD(5V) normal?
UIC1 pin no. 18,47,90
O
Front PCB
Does UX2(12MHz)
oscillate ?
O
Front PCB,
When the power is ON 'H', displays at pin no.84 ? (5V)
X
At the base of Main PCB ; PQ3 Base High Display ?
O
X |
Main PCB UIC5(78L05) IN : |
8V |
X |
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Check the Power PCB ; |
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PIC2,PR4,3 |
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Input voltage normal ? |
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RF3,4(T2A 250V) |
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O
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Replace UIC5 |
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Main PCB POSNS |
X |
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Check the Front PCB ; UQ1 |
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Check the Main PCB ; |
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voltage normal ? |
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RD3,RZD4,PC11,PR33 |
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(pin no. 28 ; 4.5V) |
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PR9,PR10,PC12 |
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O
X
Replace -com
OConnect Front PCB and Main PCB & Check the connector Main PCB Wafer CCW2,CMW2
O
Replace -com
Samsung Electronics |
6-1 |
Troubleshooting
6-1-2 F.L.T Malfunction
Connector inserted correctly?
O
Check voltage : AC 5V at FRONT-PCB FLT?
O
Check voltage at UIC1 pin no. 48(-36V)
O
Replace UIC1
X
Reinsert the connector.
X |
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Check Main-PCB & Front PCB |
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connection and the voltage of |
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CCW2, pins19,20 (AC 5V) |
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X
Check the voltage of PZD2 (-36V)
6-2 |
Samsung Electronics |
6-1-3 No Output
Main PCB OC2,OC8 (STK4221), pin no.11,13 ; B+,B circuits
O
AQ OC2,OC8 pin no.7 ;
B- (-0.3V)
O
OQ4,OQ2
Base B+ ?
X
Is Mute selected ?
X
Headphone jack
Short ?
X
Front PCB-com pin no.5 ; Check the "H"
Troubleshooting
X
Check the B+ power
source part in PBD2(GBU6D), PC1 and PC2.
X |
Check the mute |
X |
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circuit OQ1(KSR2003) |
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Replace OD8 |
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base B+ (0V) |
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O
Replace OQ1
O
Confirm for TR short
Replace it
O
Remove it with Remocon
O
Replace Headphone jack soldering condition
O
Replace -com
XCheck if the output line is short
Samsung Electronics |
6-3 |
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