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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+++++++++++++++++++++++++
FIRMWARE RENEWAL MODE
1. Turn the power on and press [EJECT] button on the remote control unit to put the LCD TV/DVD into DVD mode. Then remove the disc. 2. To put the LCD TV/DVD into F/W version up mode, press [9], [8], [7], [6], and [SEARCH MODE] buttons on the remote control unit in that order. Fig. a appears on the screen.
"*******" differs depending on the models.
5. After programming is finished, the disc will be ejected automatically. Fig. e appears on the screen and the checksum will be shown in (*2).
"*******" differ depending on the models.
F/W Version Up Mode VERSION : Completed (*2) SUM : 7ABC
Model No : ******* VERSION : *.** ************.ab7
F/W Version Up Mode
Model No : ******* VERSION : *.**
Please insert a DISC for F/W Version Up.
Fig. e Completed Program Mode Screen
EXIT: SELECT
Fig. a Version Up Mode Screen
6. 7. 8. 9.
3. Insert the disc for version up into the disc slot. 4. The LCD TV/DVD enters the F/W version up mode automatically. Fig. c appears on the screen. If you enter the F/W for different models, �Disc Error� will appear on the screen, then the disc will be ejected automatically.
"*******" differ depending on the models.
At this time, no button is available. Remove the disc. Press [CH. o / p] button on the unit to go to TV mode, or press [POWER] button on the unit to turn the power off. Press [EJECT] button on the remote control unit to put the LCD TV/DVD into DVD mode again. Press [1], [2], [3], [4], and [DISPLAY] buttons on the remote control unit in that order. Fig. g appears on the screen.
"*******" differs depending on the models.
F/W Version Up Mode VERSION : Reading...
Model No : ******* VERSION : *.** ************.ab7
(*1)
MODEL : ******* Version : *.** Region : *
EEPROM CLEAR : CLEAR
EXIT: SELECT
Fig. c Programming Mode Screen
Fig. g
The appearance shown in (*1) of Fig. c is described as follows:
No. 1 2 3 Appearance Reading... Erasing... State Sending files into the memory Erasing previous version data
10.Press [CLEAR] button on the remote control unit. Fig. h appears on the screen.
"*******" differs depending on the models.
Programming... Writing new version data
MODEL : ******* Version : *.** Region : * EEPROM CLEAR : OK
EEPROM CLEAR : CLEAR
EXIT: SELECT
Fig. h
When �OK� appears on the screen, the factory default will be set. Then the firmware renewal mode is complete. 11.To exit this mode, press [CH. o / p] or [SELECT] button to go to TV mode, or press [POWER] button to turn the power off.
8-1
L2550FW
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