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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.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
NO.22 FLOW CHART NO.23
(E-E mode is normal). Replace IC651. terminal voltage (REC AGC. ADJ.) pin(37) Is the pin(29) of IC651 about 3.7V? Is there signal inputted at each of IC651 normal? terminal of IC651 as shown in table? NO
YES Check Hi-Fi REC CTL line. NO L-ch R-ch NO YES
No E-E heard. Hi-Fi sound cannot be recorded
record FM signal output the pins(21) Is voltage 5V applied to pin(25) of IC651.
NO Check the peripheral circuit of rear (24) (ch-1)/pins(21) and (22) (ch-2) of IC651?
input terminal. Tuner audio terminal pin(48) Tuner? Check the AH-MZ connector.
YES NO Is there SIF signal from pin(24) of Check line of Hi-Fi 5V.
Rear input terminal pin(14) pin(9) NO
YES
Is voltage applied to pin(40) NO Check the regulator circuit of Hi-Fi 5V IC651, 9V applied to pin(58). and PC 9V.
FLOW CHART NO.24 (E-E mode is normal). Replace IC651.
NO
YES Hi-Fi sound cannot be played back
Are serial data and clock signal at NO Check line between pins(43), (42) of YES pins(43), (42) IC651 and pins(17), (18) IC701. playback envelope signal output to Is A-H.SW.P input into the pin(27) of IC651?
pins(29) and (30) of IC651? (300 mVp-p) NO
YES Check A-H.SW.P. line from the pin(27) of
YES NO Check line between pin(36) of IC651
Replace IC651. IC651 to the pin(26) of IC701.
Is "L" level applied at pin(36) of IC651? and pin(21) of IC701.
FLOW CHART NO.25
NO
47
Recording in linear audio is impossible (Hi-Fi E-E mode is normal). Is Sub carrier signal (3.58MHz, about
YES
Is "H" level applied at pin(28) of IC651? 900mVp-p) input to pin(45) of IC651?
NO to the pin(8) of IC201. YES
NO Check line between the pin(61) of IC651 Is audio signal input into the IC201 pin(8)? YES
Check line between emitter of Q501 NO Check the periphery pin(99) of IC201. (R617)
and pin(28) of IC651.
YES
Is the pin(99) of IC201 in "L" level? Does operate Check the bias oscillation circuit (T601, Q602,
YES RF output terminal : Is there audio signal outputted at pin(59) of IC651? NO
Line output terminal : Is there audio signal outputted at pins(53) and (57) of IC651? normally? Q603).
NO YES
Is audio on which bias signal is
superposed output to the pin(4) of IC201?
Replace IC651. YES
Check the AA-MH harness and A/C head.
Line output terminal : Check line ranging from pins(53) and (57) of IC651 to the audio
output terminal.
RF output terminal : Check line ranging from pin(59) IC651 to pin(2) of tuner (TU101).
VC-A411M VC-H811M
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