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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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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+++++++++++++++++++++++++
DV-620H DV-620S
From (2) Following playback, jump test mode "3" Key input PLAY TEST 30000001 00000000 Because a tray opens, a disk is published.
"Open/Close" Key input PLAY TEST DD000303 ******** It becomes following playback state. (******** is a sector ID.) A test jump can be done by inputting the following key from the remote controller. Key Jump Key 1 -1 3 4 -102 6 7 -510 9 C -511 M 2 -765 Repeat 5 -766 A-B 8 -7000 Program Before skipping. -15000 After skipping. Next replay Layer Jump Offset adjustment mode "Menu" Key input FOCUS 000000** 000000** FOCUS offset adjustment mode FOCUS 000000** 000000++ The part of ++ is changed at every key input. Connect the L side of the voltmeter to the IC702 (pin 18) and its H side to the IC702 (pin 17). Adjust the output voltage to a range of -30mV to +10mV with the cross key "�" or "�". With the cross joint key "�", �, 5 step change After it confirms that a spindle motor stops, "RETURN"key input (SPIN) (00000000 00000000) The offset adjustment of the spindle is done automatically. Jump 1 102 510 511 765 766 7000 15000
TRACK offset adjustment mode TRACK 000000** 000000++ The part of ++ is changed at every key input. "Retern" key input ADJUST COMPLETE 00**00** 000000** "Rapid return" key End of adjustment For the section of **, the adjustment results are displayed. The indication contents mean the "focus offset adjustment value", "track offset adjustment value" and "spindle offset adjustment value" from the left. Cut a power source when you finish adjustment. Push a "Rapid return" key when it is adjusted again. When a "return" key is pushed, it is returned in the beginning of servo adjustment mode. Connect the L side of the voltmeter to the IC702 (pin 16) and its H side to the IC702 (pin 15). Adjust the output voltage to a range of -30mV to +10mV with the cross key "�" or "�". With the cross joint key "�", �, 5 step change
"Return" key
[ROM RENEWAL MODE]
1. A DVD itself and a personal computer are articulated as the right figure. Software for the renewal is started more. 2. A power source is put with pushing a DVD's own playback key and a halt key at the same time. (It keeps pushing it for about three seconds.) R : OK It is displayed.
3. When "a lateral" is inputted in accordance with the personal computer display and data transfer indication is shown and renewal process is started normally when an ENTER key is pushed. W : STR It is displayed.
Personal computer (DOS)
4. When renewal is completed normally. W : END It is displayed.
5. "STOP" key is surely pushed if renewal is completed and the display of above NO.4 is confirmed.It is made to turn off POWER after that.
Fixture for the ROM renewal DIGITAL It is articulated to the OUT terminal connection child.
DVD itself
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