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This was an excellent source of detailed assembly information on a device which is at least 12 years old. A very lucky find, coupled with great service.
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Excellent Service Manual and best price on the Internet. This Service Manual covers everything you could ever need including full circuit schematics, component layout diagrams, stripdown procedure and full parts list/breakdown. I needed this to carry out a modification to one of these headunits and this manual covered everything I needed. Fast delivery, processed within a few hours.
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Thought I would never find a copy of the Technics SX-EN2 Service Manual until I found Owner-Manuals.com. Price was very fair and I received the download promptly. While a photocopy, it is quite readable and includes all the pertinent information and diagrams. Thank you Owner-Manuals!
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I really like this manual and it's reliable.I found and bought easly.thank you.
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Thank you very much. the Instruction corresponds to my expectations. Sent it in time. I don't regret that paid money.
KAC-PS621/X621
CIRCUIT DESCRIPTION
� 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.
1K
MPU AD-PORT OUTPUT
0.01
0.01
VOLTAGE LEVEL DETECTION
13K 1 2 3 8 470 L5
10K 7 4 6 5
D309 IC9 (2/2)
15K
10K
IC9 (1/2)
AMP RECT
� 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.
J3
4 3 7 2 6 10 13 H/U-GND 1 5
AD-I
8
Q301 to H/U
47 47 REQC
Q305 from Q307 MPU
10K 10K
12
10u35 +
11
9
Q303 H/U GND CONSTANT CURRENT
AMP GND
� I2C buffer
Using an IC for I2C communication, between-AMP communication is conducted so that there will be no trouble from GND potential differences.
5
to OTHER AMP TRANSMISSON RECEIVE
4.3K 4.3K 270
J4
24 13 270 CLK
D302
SX VCC 2 7
100K
20K 12K 1.8K
IC3
RX SY
3 6 1.8K TX RY GND TY 47
10 11
79
1 8
to MPU TRANSMISSON RECEIVE
1.5K 1.5K
DATA 10u25 10K
D301
BOTH DIRECTION BUFFER
ADJUSTMENT
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
4 5
68
270
7
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