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Quality scan, great manual. I solved my problem with this manual.
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The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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I got your link from a friend and I must say that I am really satisfied with your service. Specially this B&O manual I didn't find anywhere on the web... but you could deliver it :-) . You deliver very fast and the copy is of good quality. So your webpage is bookmarked. Thanks
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
I will use Owner-Manual.com for all my manual needs.
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A
[2] POWER SUPPLY UNIT
Flowchart of Failure Analysis for The POWER SUPPLY Unit
Failure analysis for the POWER SUPPLY Unit => PP1 STB 3.4 V power is not output.
Is the cable connected firmly to the P7 connector? Yes
B
No
Properly connect the cable between the P7 and M2 connectors.
Is the cable to the P7 connector broken? No Is the fuse (F001) blown? No Is one of the limiting resistor (FR002) blown? No The POWER SUPPLY Unit is normal.
Yes Replace the defective cable (J109).
Check the voltage at the MAIN Assy and POWER SUPPLY Unit.
Yes Replace the POWER SUPPLY Unit.
Yes Replace the POWER SUPPLY Unit.
Check the resistance between D025 cathode and C101 (+), using a tester.
C
Failure analysis for the POWER SUPPLY Unit => PP2
The power is not on, even though the RELAY port is active.
No Is the relay (RY002) on? Yes No Is the PFC voltage normal? Yes
D
Replace the POWER SUPPLY Unit.
� Check the relay operation at the RY002. (Voltage: 3.4 V) � Check the relay sound (click).
Replace the POWER SUPPLY Unit.
� Check the voltage between the C017 (-) and C017 (+). � The voltage must be around 400 V. (340V or less are defective.) Caution: High voltage!
The POWER SUPPLY Unit is normal.
Failure analysis for the POWER SUPPLY Unit => PP3
The cells of the panel do not light normally.
Is the VADR voltage within the specified values? Yes
E
No
Replace the POWER SUPPLY Unit.
The specified voltage values are between 72 and 78 V.
Is there a fluctuation in the VADR voltage? No Is the VSUS voltage within the specified range? Yes Is there a fluctuation in the VSUS voltage? No The POWER SUPPLY Unit is normal.
Yes
Replace the POWER SUPPLY Unit.
The ripple must be within 5 V.
No
Replace the POWER SUPPLY Unit.
The specified voltage values are between 200 and 210 V (VSU: 125/35°C).
Yes Replace the POWER SUPPLY Unit.
The ripple must be within 10 V.
F
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KRP-500P
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