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tres bon document
cela a permis de verifier la connection de l'ecran
The manual was of good quality with high resolution schematic diagrams.
The manual was very clear and contained all the information I was looking for. My dishwasher is working again because of this servicemanual!
Quality scan, great manual. I solved my problem with this manual.
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.
Notes: 1. CD block basically constructed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise indicated. 3. Use the oscilloscope with more than 10 Mâ¦ impedance. 4. Clean an object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.
RF signal waveform
VOLT/DIV: 200 mV TIME/DIV: 500 ns (with the 10: 1 probe in use) level: 1.3 +0.25 Vp-p â0.20
S-Curve Check Connection:
BD board TP (FE) TP (VC)
When observing the eye pattern, set the oscilloscope for AC range and raise vertical sensitivity. When a general remote commander is not used (1 Track Jump Check): Procedure: 1. Connect the oscilloscope to TP (TE) and TP (VC) on BD board. 2. Turned power switch on. 3. Put disc (YEDS-18) in and press the ï¬ button, and play the number five track. 4. Press the ï¬ button. (Becomes the 1 track jump mode) 5. Confirm that the level B of the oscilloscope's waveform and the A (DC voltage) of the center of the traverse waveform. Confirm the following:
Procedure: 1. Connect the oscilloscope to TP (FE) and TP (VC) on BD board. 2. Connect between test point TP (FOK) and GND by lead wire. 3. Turned power switch on. 4. Put disc (YEDS-18) in and turned power switch on again and actuate the focus search. (actuate the focus search when disc table is moving in and out.) 5. Confirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 3.0 Â± 1.0 Vp-p.
AâB Ã 100 = Â± 7 (%) 2 (A + B)
Center of the waveform B
1 track jump waveform
within 3.0 Â± 1.0 Vp-p
A (DC voltage) 0V
6. After check, remove the lead wire connected in step 2.
level: 1.3 Â± 0.6 Vp-p
Note: â¢ Try to measure several times to make sure that the ratio of A : B or B : A is more than 10 : 7. â¢ Take sweep time as long as possible and light up the brightness to obtain best waveform.
[BD Board] (Side A)
RF Level Check Connection:
oscilloscope (AC range)
BD board TP (RF) TP (VC)
IC101 TP (FOK) IC103
Procedure: 1. Connect the oscilloscope to TP (RF) and TP (VC) on BD board. 2. Turned power switch on. 3. Put disc (YEDS-18) in and press the ï¬ button. 4. Confirm that the oscilloscope waveform is clear and check RF signal level is correct or not.
Note: Clear RF signal waveform means that the shape âââ can be clearly distinguished at the center of the waveform.
TP (TE) TP (FE)
TP (RF) TP (VC)
â 17 â