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Quality scan, great manual. I solved my problem with this manual.
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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.
TABLE OF CONTENTS 1. GENERAL ............................................................................ 3 2. DISASSEMBLY
2-1. Panel, Front Assembly ........................................................ 4 2-2. Display Board, Encoder Board, AC SW Board .................. 4 2-3. Panel Front ......................................................................... 4
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, �metallized� knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.
3. TEST MODE ........................................................................ 5 4. ELECTRICAL ADJUSTMENTS ................................... 7 5. DIAGRAMS
5-1. 5-2. 5-3. 5-4. 5-5. 5-6. 5-7. 5-8. Circuit Boards Location ................................................... 11 Printed Wiring Board � Display Section � ....................... 13 Schematic Diagram � Display Section � .......................... 15 Printed Wiring Board � Tuner Section � .......................... 17 Schematic Diagram � Tuner Section (1/2)� ..................... 19 Schematic Diagram � Tuner Section (2/2)� ..................... 21 IC Pin Function ................................................................ 23 IC Block Diagrams ........................................................... 24
LEAKAGE
The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampers). Leakage current can be measured by any one of three methods. 1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers� instructions to use these instruments. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The �limit� indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)
2.
6. EXPLODED VIEW
6-1. Front Panel and Case Section ........................................... 25
3.
7. ELECTRICAL PARTS LIST ......................................... 26
To Exposed Metal Parts on Set
0.15µF
1.5k�
AC voltmeter (0.75V)
Earth Ground Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
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