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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.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
GEX-P7000TV,P7000TVP
Before adjustment, set the diversity to 1 so as to prevent the circuit from operating during input signals are weak (use �1� input for antenna input). Use rear monitor or OSD output for the video monitor.
Procedure Adjustment Item 1 Diversity adjustment Input signal Adjustment Adjustment method Point Monitor the voltage of pin 2 of IC1001 (PM0013AM) and adjust the DC voltage to 2.5V ± 0.1V.(DC V Meter(1)) Note: If this has not been adjusted properly, extreme diversity switching occurs even with good receiving conditions, causing voice interruption. 2 Center meter Receive TV point adjustment B signals (US Band 10ch) L401 Monitor the voltage between pins 9 and 12 of IC401 (LA1145M) and reduce the potential difference between both edges to zero. (Center Meter) Note: If this has not been adjusted properly, the voice becomes low too fast as input signals become weak. Even worse, sound may be strained or no sound output. 3 SD adjustment Receive TV point B signals (US Band 10ch) RF level: 33 dBµ 4 RGB level adjustment Input white 100% with burst signal 1Vp-p to VTR1. VR801 VR402 Monitor the voltage of pin 19 of IC401 (LA1145M) and adjust the DC voltage to 2.5V ± 1.0V.(DC V Meter(2)) Note: If this has not been adjusted properly, seek may stop even without any signal input or may not stop even when turning input signals stronger. Turn the TV on and enable VTR1 using the menu screen setting. Set the source to VTR1 and monitor the waveform of pin 2 of RGB monitor output CN4801. Adjust the video output of pin 2 as follows: When the RGB monitor or 75� is connected to CN4801: 0.7Vp-p ± 0.1V (Oscilloscope(1))
Receive TV signals. TC1001
When nothing is connected to CN4801: 1.4Vp-p ± 0.2V (DSENS(Pin 12):Connect to GND) Note: If this has not been adjusted properly, the screen becomes too 5 OSD clock adjustment Input white 100% with burst signal 1Vp-p to VTR1 TC2801 bright or dark. Before this adjustment, connect the RGB monitor (since return synchronous signals are required to be input from the monitor). Connect AVX-7000. Turn the TV on and enable VTR1 using the menu screen setting. Set the source to VTR1 and display the OSD menu screen. Adjust the screen so that the OSD display comes center. Note: If this has not been adjusted properly, the menu screen OSD display shifts. Set the MODE switch (S1001) to the FM modulator mode. Connect a multi-CD and start-up the source with the CD. Set the modulator frequency to 89.1 MHz on the menu screen. Monitor the collector voltage (positive side of C537) of Q503 and adjust the DC voltage to 3.0V ± 0.1V.(DC V Meter(3)) Note: To use the menu screen, connect an RGB monitor. Note: If this has not been adjusted properly, RF is strained when the modulator frequency is low or high.
6
FM modulator tuning voltage adjustment
Play a �� CD.
L507
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