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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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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
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A
No sound from the speakers
No sound from the speakers Yes Is sound muting set? No Is the volume set to "0"? Yes Raise the volume then check again. Is it only the FRONT input sound that doesn't come out? Yes Yes Is a signal input to IC4401? (pin 1), (pin 3) Yes Check the communications No around the FE (U4401 or U4402) and between the FE (U4401 or U4402) and the microcomputer. Check around IC4402 and No check the communications between IC4402 and the FE. Is the flexible cable between No Connect Flexible cable, CN4001 and CN7804 then check again. connected normal? Yes Is a signal input to IC4801? (pin 25), (pin 26) No Yes Cancel muting then check again.
B
No Is it the only TV sound that doesn't come out?
No
C
Is a signal input to IC4402? (pin 7) Yes
33
Is it only HDMI sound that doesn't come out? Yes
No
Is a signal output from IC4402? (pin 22), (pin 23) Yes
34
Check the communications No around the IC4402 and between the IC4402 and the microcmputer.
Is a signal output from IC6405? (pin 7), (pin 8) Yes
36
around IC6405 and No Check the communication check between IC6405 and the microcomputer.
D
Is a signal input to IC4801? (pin 19), (pin 20)
35
Yes Is a signal output from IC4801? (pin 35), (pin 36) Yes Is a signal output from CN4005? (pin 35), (pin36) Yes
No Check the communication between IC4402 and IC4801.
Is a signal input to IC4801? (pin 10), (pin 11)
37
Yes
No Check the communication between IC6405 and IC4801.
Check around IC4801 and No check the communications
38
between IC4801 and the microcomputer.
Is it the only input REAR input analog sound that doesn't come out? Yes Is a signals input to IC4801? No Check the communication between the jack and IC4801.
E
No Check the communication between CN4005 and CN1402.
38
Has the signal come to CN7201? (pin 13), (pin20) Yes Has the symptom been settled when the system cable is replaced? Yes Finishing troubleshooting No The panel is defective. No Check the communication between CN7201 and IC4801. Yes
39
F
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PDP-R06U
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