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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+++++++++++++++++++++++++
KDC-8021/M9021/X859
TEST MODE
Security items
1. Forced power-ON mode (all models) Even when writing is permitted by the security function (mask key), Power-on can be set for a 30 minute period each time the reset key is pressed while holding down the Q key and [4/8] keys. After 30 minutes elapses, can only be restored by using reset. 2. How to register the security code for EEPROM (F/E) replacement (coded security models) (1) Enter the test mode. (See "1. How to enter the test mode") (2) Press the [4/8] key to enter the MENU MODE. (3) While "Security" is displayed, press and hold the Track up or down key for a second to enter the security registration mode. (4) Enter the code using the FM/AM/Track up/Track down keys. FM key: Increments the number. AM key: Decrements the number. Track up key: Moves the cursor to the right. Track down key: Moves the cursor to the left. (5) Hold down the Track up key for at least 3 seconds and the message, "RE-ENTER" appears, so once again enter the code according to Step 4 above. (6) Hold down the Track up key for at least 3 seconds, and the message, "APPROVED" appears. (7) Cancel test mode. (See, 2. How to cancel the test mode.) Note: All clear cannot be performed on the security code for this model. 3. Simple way to clear the security code (K type only) (1) During code request mode, press the Track Up key for at least 3 seconds while holding down the AUTO key. (---- will disappear) (2) Enter, "KCAR" with the remote controller as described below. (Same as on 01 model.) � Press the remote controller 5 key twice, and press the Track Up key. (Enters a "K") � Press the remote controller 2 key three times, and press the Track Up key. (Enters a "C") � Press the remote controller 2 key once, and press the Track Up key. (Enters an "A") � Press the remote controller 7 key twice, and press the Track Up key. (Enters an "R") (3) Security function is canceled and unit sets to All-Off mode. (4) Code request mode appears if a mistake was made in entering the numbers. 4. Method of writing the Mask key while the EEPROM is in the initial status (1) Enter the test mode. (See "1. How to enter the test mode") (2) Press the [4/8] key to enter the Mask key registration mode. "TRANSMIT1" should be displayed now. The display at this time should show "< >" in place of "[ ]". (3) Point the Mask key remote toward the light sensor, and press and hold its key for more than 0.5 second. (4) When "TRANSMIT2" is displayed, press and hold the key on the Mask key remote for more than 0.5 second again. The first and second counter codes are not compared at this time. (5) When "APPROVED" is displayed, the write operation is complete. Now the demonstration mode is initiated and the test mode is terminated. (Note) In the same way as previous models, if 30 minutes have elapsed with no code written, an error occurs and the power is turned OFF. 5. Method of initializing the Mask key (How to reset the unit from the Mask key approved condition to the factory condition) (1) Enter the test mode. (See "1. How to enter the test mode") (2) "TRANSMIT1" is displayed and the Mask key entry request mode is initiated. The display at this time should show "� �" in place of "[ ]". (3) Press and hold the key on the Master key remote for more than 3 seconds. (4) When "TRANSMIT2" is displayed, press and hold the key on the Master key remote for more than 3 seconds again. (5) When "APPROVED" is displayed, the Mask key is cleared, the demonstration mode is initiated, the test mode is terminated and the unit returns to the factory condition. 6. Method of clearing all Mask key-related data (1) Enter the test mode. (See "1. How to enter the test mode") (2) Press the [4/8] key to enter the Mask key registration mode. "TRANSMIT1" should be displayed now. (3) Point the Master key remote toward the light sensor, and press and hold its key for more than 3 seconds (until the level display shows the full condition). (4) When "TRANSMIT2" is displayed, hold the key on the Mask key remote for more than 3 seconds again. If " TRANSMIT1 "is displayed in place of" TRANSMIT2 ", restart the procedure from step 3. (5) When "APPROVED" is displayed, all security data is cleared and the unit returns to the condition before Mask key writing with the EEPROM in the initial status
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