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Thought I would never find a copy of the Technics SX-EN2 Service Manual until I found Owner-Manuals.com. Price was very fair and I received the download promptly. While a photocopy, it is quite readable and includes all the pertinent information and diagrams. Thank you Owner-Manuals!
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AVX-P7000CD,AVX-7000
3No power
No power NO F801 (fuse) is broken out? YES 18.5V is obtained at TP02? If not, the resistance between TP02 and GND is 100k ohms or more? NO Check 18.5V line to remove short-circuits. (CN003 and its periphery) NO
Replace F801.
7V is obtained at TP03? if not, the resistance between TP03 and GND is 500 ohms or more?
Check 7V line to remove short-circuits. (Q201, Q202, Q203, and their periphery)
5V is obtained at TP04? If not, the resistance between TP04 and GND is 35 ohms or more?
Check 5V line to remove short-circuits. (Q201, Q208, Q651, and their periphery)
(-15.5)V is obtained at TP05? If not, the resistance between TP05 and GND is 950 ohms or more?
Check (-15.5)V line to remove short-circuits. (Q881, CN003, and their periphery)
(-5)V is obtained at TP06? If not, the resistance between TP06 and GND is 400 ohms or more?
Check (-5)V line to remove short-circuits. (Q201, Q202, Q203, and their periphery)
Input voltage 9V is obtained at Pin-5 of Q801 (FA7610N)?
Check F801, input flexible cables, and their periphery.
Triangular waves are obtained at Pin-6 of Q801 (FA7610N)?
Check Q801 and its periphery.
Switching waves are obtained at Q804 (TR)?
Check Q801 and its periphery.
Check Transformer (T801) and replace it.
4Out of Sync
Out of Sync YES Video signal is obtained at Q653 (TR)? NO
Check input flexible cables, Q651, and their periphery.
Video signal is obtained at Pin-60 of Q201 (NJW1300A)?
Check R229 (LPF, 360 ohms) and its periphery.
Full-wave oscillating waveform is obtained at Pin-55 and Pin-56 of Q201 (NJW1300A)?
Check X202 (Ceramic resonator) and its periphery.
5V is obtained at Pin-61 of Q201 (NJW1300A)?
Go to item3 No power.
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