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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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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.
61R-WP5H 55R-WP5H
Servicing precautions 1. Protector Operation
This model is provided with five protector circuits. Below discussed are the behaviors and indications of these circuits. (Note: In some cases, the LED flashing cycle and possible trouble spot may be inconsistent.) 1 Over-current Protector Circuit: A rush current into the flyback transformer is detected. The circuit is activated if an over-current flows in. Indication: The power LED (red) flashes once. 2 X-Radiation Protector Circuit: This circuit is activated if the rectified heater voltage rises above its specified level. Indication: The power LED (red) flashes once.
ON
OFF
0.2
1.4
(seconds)
3 Vertical Output Protector Circuit: The vertical output is detected. The circuit is activated if the vertical output is missing (horizontal-only screen or the like). Indication: The power LED (red) flashes twice
ON
0.2 0.2
OFF
0.2
1.4
(seconds)
4 +B Under-voltage Protector Circuit: The voltages at the 10V, 25V, 32V, -8V and -25V lines of the switching regulator are detected. The circuit is activated if any of the voltages drops below its specified level. 5 +B Over-voltage Protector Circuit: The voltages at the 10V, 25V, 32V and -25V lines are detected. The circuit is activated if any of the voltages rises above its specified level. Indication: The power LED (red) flashes three times.
ON
0.2
OFF
0.2
0.2
0.2
0.2
6 IC507 (DEF PROCESSOR) I2C Bass ERROR Protector: If for any reason, the IC507 fails to return an ACKNOWLEDGE signal to the microprocessor.
ON
OFF
0.4 0.2
0.2
0.4
2. Stop of Protector Operation
The protector may be kept inactive by opening the detection circuits or grounding C3230 and C3231 (on the Signal Unit). The vertical output protector circuit, however, cannot be made inactive. Note: Be sure to get the protector back to normal after servicing.
0.2
(seconds)
22
0.2
1.4
(seconds)
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