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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+++++++++++++++++++++++++
MJ-L11
7 Defocus Adjustment
It is possible from steps 3 of this item in the state of step 5 of 6 .
Step No.
1 2 3
Operation Keys and Operation Method
In the Power ON state, selecting MD function,shortcircuit the "MECHA and GNG pin". Insert the test disc GGF1328 (MMD-212). Press the SYSTEM MENU(or MENU) key.(until "deFO AJST" is displayed.) Press the 6(or MD)key. of Defocus Value j
Display
EJECT LOADING GRT AJST deFO AJST PEG : FESpp : of000j0150 Test mode
Status
Remarks
4
Defocus mode is entered, and after automatic execution of normal adjustment.
5 6
Check the jitter value and end the adjustment when the intermediate jitter value is 29 nsec or less. Press the ¶ (REC)of main unit key. of+04 j0130 The C1 error with application of a focus offset of about 0.4µm on the + side is displayed. The jitter value (J+) at this time is recorded. The C1 error with application of a focus offset of about 0.4µm on the � side is displayed. The jitter value (J�) at this time is recorded.
7
Press the ¶ (REC)of main unit key.
of-04 j0120
8
When J+ is larger than J-, press the ¶ (REC) of the main unit key when the focus offset is applied up to +0.4µm. (Do nothig when J- is larger than J+.)
of+04 j0130
9
Change the value with 1 and ¡ keys until the value becomes the same. Press the 6(or MD)key.
of+04 j0132 of+03 j0125 of+02 j0120 COMPLETE
10
When the smaller offset of the jitter value has been corrected mistakenly, press the ENTER(or SET) key and return to step 4. The mean value of the changed set value and the offset of the other setting limit is written into the EEPROM as the compensation offset. Release from the test mode.
11
Turn off the power of the DVD tuner(or CD tuner).
Good Bye
Connection Diagram
Jitter Meter
LEVEL JITTER
MD CORE MAIN UNIT
SIDE A
EFM MON
GND
REFO
36
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