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The manual was of good quality with high resolution schematic diagrams.
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The manual was very clear and contained all the information I was looking for. My dishwasher is working again because of this servicemanual!
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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!!!!
Video Detection Coil Adjsutment * Open soldering pad IF. Pattern Signal generator generator TV-350 Set Low-pass filter
Oscilloscope
Input TP2
Output TP3
R=180 ohm C=0.01 µF Input Input Connection Point Pattern generator Signal generator Input Signal Color bar 38.9MHz 41 ± 3dBµ Adjust Output Connection Low-pass filter Oscilloscope Output Point Result
TP2
T200
TP3
Adjust for DC level at mini-
AFT Coil Adjustment * Open soldering pad IF. Sweep generator TV-350 Set
Oscilloscope
Voltmeter
Input TP2
Output TP4
Sweep generator
TP2
38.9 ± 5MHz (Sweep) Marker: T201 38.9MHz 70dBµ
Voltmeter Oscilloscope
TP4
Adjust for 1.8 ± 0.2V reading on voltmeter. Confirm that the marker is at the middle of S-curve on oscilloscope.
Contrast Adjustment * Open soldering pad IF. Pattern generator Signal generator TV-350 Set Low-pass filter Input TP2 Output TP5 R=100 ohm C=2700 pF Pattern generator Signal generator
�6�
Oscilloscope
TP2
Color bar 38.9MHz 70dBµ
Adjust step form wave to read VR300 Oscilloscope TP5 0.75 ± 0.05 Vp-p.
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