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SONY MDXC7890R
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY MDXC7890R Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 14 (click to view)
SECTION 4 ELECTRICAL ADJUSTMENTS
TEST MODE This set have the test mode function. In the test mode, FM Auto Scan/Stop Level and MW Auto Scan/Stop Level adjustments can be performed easier than it in ordinary procedure. <Set the Test Mode> 1. Set the “power select” switch (S700) is “A (ON) ” position. 2. Turn ON the regulated power supply. (All LEDs on the set lights up, and the clock is displayed.)
Note: Press the [OFF] button, if the clock is not displayed.

Procedure: 1. Set to the test mode. 2. Push the [SOURCE] button and set to FM. Display
SHUF

REG

3. 4. 5. 6.

Push the preset [4] button. Push the preset [5] button. Press the preset [1] button for more than two seconds. Then the display indicates all lights, the test mode is set.

3. Adjust with the volume RV2 on TU1 so that the “FM” indication turns to “FM0” indication on the display window. But, in case of already indicated “FM0”, turn the RV2 so that put out light “0” indication and adjustment. Display
SHUF

<Release the Test mode> 1. Push the [OFF] button. 2. Return the “power select” switch (S700) to initially set position.
REG

See the adjustment location from on page 16 for the adjustment.

Adjustment Location: See page 16. FM Stereo Separation Adjustment Setting: [SOURCE] button: FM
FM RF signal generator antenna jack (J1) 0.01 µF set 4Ω + – level meter

MD SECTION
MD section adjustments are done automatically in this set.

TUNER SECTION

0 dB=1 µV

Cautions during repair When the tuner unit is defective, replace it by a new one because its internal block is difficult to repair.

Carrier frequency Output level Mode Modulation

Note: Adjust the tuner section in the sequence shown below. 1. FM Auto Scan/Stop Level Adjustment. 2. FM Stereo Separation Adjustment. 3. MW Auto Scan/stop Level Adjustment. 4. RDS S-Meter Adjustment.

: 98.0 MHz : 70 dB (3.2 mV) speaker out terminal : stereo : main: 1 kHz, 33.75 kHz deviation (45%) sub: 1 kHz, 33.75 kHz deviation (45%) 19 kHz pilot: 7.5 kHz deviation (10%)

Procedure:
FM Stereo signal generator output channel L-CH R-CH L-CH L-CH R-CH R-CH A B Adjust RV4 on TU1 for minimum reading. C D L-CH Adjust RV4 on TU1 for minimum reading. Level meter connection Level meter reading (dB)

FM Auto Scan/Stop Level Adjustment Setting: [SOURCE] button: FM
FM RF signal generator

antenna jack (J1)
0.01 µF
R-CH

set
Carrier frequency Output level Mode Modulation : 98.0 MHz : 22 dB (12.6 µV) : mono : 1 kHz, 22.5 kHz deviation (30%)

L-CH Stereo separation: A-B R-CH Stereo separation: C-D The separations of both channels should be equal. Specification: Separation more than 30 dB Adjustment Location: See page 16.

– 14 –

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