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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
A
Turn the main power on with the cable to the CN2401 or CN2301 disconnected. Check if 5 V DC is output from Pin 8 of CN2301. YES NO Failure in the CN2301 or LED PWB (failure in the M5V line at Pin 8 of the CN2401)
Turn the main power on with the cable to the CN2302 or CN9010 disconnected. Check if 5 V DC is output from Pin 20 of CN9010. YES NO Is 5 V DC output from Pin 5 of IC9502? NO Failure in the MAIN PWB (failure in the IC9502) Failure in the CN2302 or COMM SLOT IF PWB (failure in the M5V line at Pin 20 of the CN2302)
B
YES Turn the main power on with the COMM SLOT Assy disconnected from CN2303. Check if 3.3 V DC is output from Pin 118 of CN2303.
C
YES NO
Failure in the COMM SLOT Assy (failure in the M3.3V line at Pin 118 of the CN2303)
Turn the main power on with the cable to the CN2302 or CN9010 disconnected. Check if 3.3 V DC is output from Pin 16 of CN9010. YES NO Turn the main power on with the cable to the CN4004 or CN5301 disconnected. Check if 3.3 V DC is output from Pin 50 of CN5301. YES NO Failure in the CN4004 or COMM SLOT IF PWB (failure in the M3.3V line at Pin 1 of the CN4004) Failure in the CN2302 or COMM SLOT IF PWB (failure in the M3.3V line at Pin 16 of the CN2302)
D
Turn the main power on with the cable to the CN2201 or CN9011 disconnected. Check if 3.3 V DC is output from Pin 1 of CN9011. YES NO Is 3.3 V DC output from Pin 4 of IC9503? YES Is 0 V DC output from Pin 14 of CN8502 (AD2)? NO (4.7V) Failure in the AD2 connector or MAIN PWB (failure in IC9501 or X9501) Note: If IC9501 is in failure, replace the whole board. NO Failure in the MAIN PWB (failure in the IC9503)
E
Failure in the CN2201 or KEY PWB (failure in the M3.3V line at Pin 1 of the CN9011)
YES Failure in the MAIN PWB (failure in IC9501 or X9501) Note: If IC9501 is in failure, replace the whole board.
F
PDP-425CMX
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