Memorex MT2025D Service Manual - Page 9

Make C713/C714 open. Multimeter is at band R

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Maintenance Service and Trouble shooting 5 Picture exists but no sound Make C713/C714 open. Multimeter is at band RΧ1K. Red probe connect to ground. Touch No.6 OR No.8 of IC701 with No noise Power amplifier is abnormal. Inspect IC701 and peripheral components of IC701 Have noise Make C713 OR C714 collector open. Touch No.6 OR No.8 of Q702 with black probe to see if Yes Inspect C713、C714 No Check to see if +16V exists Yes Inspect IC201 and peripheral component of IC201 No Inspect +16V power supply 6. Lack of red Check to see if V501 is open or not well welded Yes Change V501 or weld V501 again No Check to see if voltages of SK501 are normal No Inspect RI5n0s2p,Re5c0t 3,R504 Yes Inspect the circuit from No.51 of IC201 to No.3 of SK501 4 PDF pdf Fact or y Pr o wÿww. f i nepr i nt . com. cn

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4
5
6.
Make C713/C714 open. Multimeter is at band R
Χ
1K. Red
probe connect to ground. Touch No.6 OR No.8 of IC701 with
Picture exists but no sound
Make C713 OR C714 collector
open. Touch No.6 OR No.8 of
Q702 with black probe to see if
Power amplifier is abnormal.
Inspect IC701 and peripheral
components of IC701
Inspect C713
、
C714
Check to see if
+16V exists
Inspect IC201 and peripheral
component of IC201
Inspect +16V
power supply
Yes
No
Yes
No
Yes
No
Have noise
No noise
Inspect
Inspect the circuit from
No.51 of IC201 to
No.3 of SK501
Yes
No
Change V501 or
weld V501 again
Check to see if voltages of SK501
are normal
Lack of red
Check to see if V501 is
open or not well welded
Inspect R502,R503,R504
Maintenance Service and Trouble shooting
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