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Manual acquired with good resolution, complete in all its pages, very good policy of the folder where are saved all products purchased.
Service manual very complete and clear. It was very helpfull for my work.
This is the 2nd time I download manuals from this website and I can say it's what I was expecting. It contains schematic, layout (decent quality), short description, parts and dissasembly instructions. I recomend it for anyone who wants to repair/modify this device.
Very useful Service Manual! With it I was able to identify the damaged pots in my old amplifier, purchase the adequate replacements and make myself the repair.
I have again my old amplifier, still a very good one that I will keep for as many years as I can!
Thanks to Owner Manuals!
Good price for the manual and easy to locate on the site and download. Plus, just like the original. Thanks a lot.
â Current detection circuit
Amplify and rectify potential differences at two points in the primary-side current circuit and send it to the AD-port of the MPU and obtain data for displaying current value.
MPU AD-PORT OUTPUT
VOLTAGE LEVEL DETECTION
13K 1 2 3 8 470 L5
10K 7 4 6 5
D309 IC9 (2/2)
â Constant current output circuit
Remove troubles caused by the potential differences between the constant current output and the GND, so that the GND potential differences between the H/U and the AMP is not overlapped in the AMP to H/U communication.
4 3 7 2 6 10 13 H/U-GND 1 5
Q301 to H/U
47 47 REQC
Q305 from Q307 MPU
Q303 H/U GND CONSTANT CURRENT
â I2C buffer
Using an IC for I2C communication, between-AMP communication is conducted so that there will be no trouble from GND potential differences.
to OTHER AMP TRANSMISSON RECEIVE
4.3K 4.3K 270
24 13 270 CLK
SX VCC 2 7
20K 12K 1.8K
3 6 1.8K TX RY GND TY 47
to MPU TRANSMISSON RECEIVE
DATA 10u25 10K
BOTH DIRECTION BUFFER
No. 1 Item IDEL CURRENT VR2 (Rch) check land A, B. Alignment Point VR1 (Lch) Method Connect a DC voltmeter between 2.5mV 2 minutes (X09-577) Align For Note After Power on Fig. PC board