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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!
A+++++++++++++++++++++++++
PHENOMENON 10. The paper free mechanism doesn�t work.
CONDITION In standby position, the paper cannot be pulled out in the forward direction
CAUSE (1) Improperly driving gear train on the frame T side B
CHECK POINT AND METHOD In standby position, manually check if the paper feeding roller rotates forward smoothly. Manually operate the ribbon feed driving lever, and check if it disengages from the cam gear due to the operation of or friction from the ribbon feed dniving lever shaft. While manually operating the ribbon feeding lever, check the points below: Does the ribbon feeding lever grate against the ribbon feeding lever shaft? Is the top or bottom gap of the ribbon feeding lever so large that the ribbon feeding lever disengages from the ribbon feed driving lever? Is the ribbon feeding lever deformed?
REPAIR METHOD If not, re-assemble the gear train (see section 3-2-2, Main Assembly A).
11. The ribbon mechanism doesn�t work
The print mechanism operates normally, but the ribbon mechanism doesn�t work
(1) Malfunction of the ribbon feeding drive lever
A
If the ribbon feed driving lever disengages, replace it.
(2) Malfunction of ribbon feeding lever
A
If yes in any of the three cases, replace the ribbon unit.
(3) Malfunction of ribbon feeding lever spring
A
Release the ribbon feed driving lever and move the ribbon feeding lever back and forth, then check if the ribbon feeding lever is returned to its original position by the ribbon feeding lever spring. Check if the spool gears rotate smoothly. Check if either the ribbon feeding pawl spring is detached/stretched or if the ribbon feeding pawl is damaged.
If not, replace the ribbon feeding lever spring.
(4) Faulty rotation of a spool gear 12. The ribbon is not being taken up The ribbon feed driving lever and ribbon feeding lever operate normally, but the ribbon cannot be taken up (1) Detached/ stretched ribbon feeding pawl spring or damaged ribbon feeding pawl (2) Malfunction of the detent pawl (3) Worn or chipped spool gear
A
If not, replace the pertinent spool gear. If the spring is detached, reattach it; if stretched, replace it. If the ribbon feeding pawl is damaged, replace the ribbon unit. If the spring is detached, reattach it; if stretched, replace it. Replace the worn or damaged spool gear.
A
A
Check if the ribbon detecting spring is detached or stretched. Check if the spool gears are worn or damaged.
A
 $4.99 M405R SHARP
Parts Catalog Parts Catalog only. It's available in PDF format. Useful, if Your equipment is broken and You need t…
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