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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.
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A+++++++++++++++++++++++++
29B-FX5 29B-FG5
FOCUS ADJUSTMENT
NO ADJUSTMENT POINT 1 DYNAMIC FOCUS ADJUSTMENT L1680 (In the power unit.) ADJUSTMENT CONDITION / PROCEDURE (1) Received E-5 CH (Monoscope pattern). (2) With the remote controller, make it normal. (3) Connect the synchroscope to the eight pins of T1680. (4) Turning L1680, adjust the amplitude of the horizontal frequency waveform to 1000 Vp-p.
1000±20Vp-p
CUT OFF, BKGD ADJUSTMENT
WAVEFORM OR OTHERS Approx. 1000 Vp-p
NO ADJUSTMENT POINT 1 CRT CUTOFF (CUT OFF BKGD) Service mode I2C BUS DATA
ADJUSTMENT CONDITION / PROCEDURE (1) Receive E-5 CH (Monoscope Pattern). (2) Select P-NORM with the remote controller. (3) Turn on the service SW, and select the CUT OFF BKGD mode . (4) Select the screen VR 0/10.
WAVEFORM OR OTHERS * Before doing the adjustment, make sure the R/G/B-cut and B/G-Drive is at initial values.
ADJUSTMENT. (5) Press "-/--" key of the remote controller to select the horizontal centering mode. (6) Turn the screen VR clockwise, and adjust the first lighting horizontal centering raster to slightly light. (7) Adjust the CUT OFF data of two other colors,
V-FREQ.
On the monocolor screen of white and coarsely adjust the horizontal centering to or green.
2
FOCUS ADJUSTMENT FBT FOCUSVR 1
(1) Received E-5 CH (Monoscope pattern). (2) With the remote controller, make it normal. (3) Adjust the focus VR-1 (F1) to make the horizontal line around �575� on the bottom left of the screen as fine as possible. (4) Adjust the focus VR-2 (F2) to make the vertical line around �575� on the bottom left of the screen as fine as possible. (5) Repeat item 3 once again to adjust the focus.
become white. (Note 1) (8) Turn the screen VR in the opposite direction to the point where the horizontal centering raster goes out. Note 1: Apply the adjustment after aging with the beam current 1,600 1 ±50µA or more for 30 min or more. (9) Press "-/--" key of the remote controller to select the normal mode. 2 WHITE BALANCE BACKGROUND (CUT OFF BKGD) I2C BUS DATA (1) Receive E-5 CH (Monoscope Pattern). (2) Select P-NORM with the remote controller. (3) Connect the beam ammeter between TP1601 and TP1602. (4) Coarsely adjust the beam current to approx. Note1: R CUT OFF UP DOWN G CUT OFF UP DOWN "1"KEY "4"KEY "2"KEY "5"KEY
ADJUSTMENT. 1.8mA with R1633 (Sub-Contrast VR). (RF SIGNAL) (5) Receive the window pattern with AV input. (PAL burst is generated with the signal generator.) (6) With the data of G-drive and B-drive, adjust the color temperature 17,000K 2 or 18,000K 1 of the white peak to white. (7) Adjust the right dark area of the window to 17,000K 2 or 18,000K 1 with R-cut off, G-cut off and B-cut off. (8) Readjust the color temperature at the white peak. (9) Check 17,000K 2 or 18,000K 1 at the low white. Note1 : Apply this adjustment after aging with the beam current 1,600 1 ±50µA or more for 30 min or more. (On the white or green minocolor screen) *The colour temperature is based on the shipment initial setting table. 3 WHITE BALANCE (1) The window pattern is received with DVD BACKGROUND signal (component signal). (CUT OFF DVD (2) Apply the adjustment in the same manner as BKGD) 2-(5) and the subsequence above. (17,000 °K I2C BUS DATA or 18,000 °K 1 ) (G-DRIVE, B-DRIVE, 2 ADJUSTMENT (DVD SIGNAL) R-CUT OFF, G-CUT OFF, B-CUT OFF) Apply the adjustment after the end of 2.
B CUT OFF UP "3"KEY DOWN "6"KEY Data up/down is possible with the above comparison. 17,000 °K X: 0.261 Y: 0.261 2 18,000 °K X: 0.255 Y: 0.255 1 * 12,300 °K X: 0.272 Y: 0.275 (With Monolta color thermometer CA-100) Note1: G-DRIVE UP "7"KEY DOWN "KEY B-DRIVE UP "8"KEY DOWN "0"KEY Data up/Down is possible with the above comparison.
12
12-1
Note2: Use the window pattern of the signal generator for adjustment. (PAL, colour burst is generated with signal generator.)
12-2
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