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