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PIONEER BE-4140/KUW
Service Manual


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

Description of PIONEER BE-4140/KUW 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 47 (click to view)
BE-4140

6. ADJUSTMENT
Perform this adjustment more than 30 minutes after the power is turned on.

7 Equipment used
• • • • • • Spectrum analyzer Oscilloscope Digital voltmeter Video SG Variable resistance attenuator Audio analyzer

BE-4140
DPS Assy
+5V (D) 1 D.GND 6

• FM linear detector • C.W.Signal Generator

Digital Voltmeter
VR1

6.1 DC5V Adjustment
1. Connect the digital voltmeter to CN1004 pin 1 [+5V (D)] and pin 6 [GND (D)] of the DPS ASSY (Connection Diagram 1). +0.02 2. Adjust VR1 of the POWER unit, set to 5.00V - 0.01V

CN1004

POWER Unit

Connection Diagram 1

6.2 Adjustment of DPS ASSY (Video SCR ASSY)
• If deviation of the time axis occurs on the oscilloscope screen, or to move the screen to have a better view, perform fine adjustment using a delay. However do not change the ranges of the vertical and horizontal axes. • When reading the waveform on the oscilloscope screen, read the center of the waveform noise. • If the signal waveform on the oscilloscope is difficult to read, adjust the luminance.

DPS ASSY
VIDEO IN CN3001 (J1001)

VR1004 (RV1004) VIDEO OUT CN3002 (J1002) VR1003 (RV1003) IC1021 IC1020

6.2.1 Adjustment of video output pedestal potential
1. Connect the equipment as shown by the dotted lines in Connection Diagram 2. 2. Set the equipment as shown below. a. Oscilloscope 0.1V/div (DC mode) 5µs/div H-SYNC TRG. b. Video SG Staircase signal (1 Vp-p/75Ω) 3. Set the oscilloscope to the GND mode, and adjust the oscilloscope so that the luminance line is at the center of the oscilloscope. 4. Connect the equipment to the CN3002 (J1002) of the DPS ASSY using a tool as shown by the lines in Connection Diagram 2. 5. Set the unit to the STANDBY mode. The other functions can be set as desired. 6. Set the oscilloscope to the DC mode, and adjust VR1004 (RV1004) in the DPS ASSY so that the pedestal potential of the video waveform satisfies the GND potential set at step 3 (within 0±0.02V).
VIDEO SG

FL1002 IC1016

VR1001 (RV1001) CN1007

Fig.1 Adjustment Locations

BE-4140 Video in DPS ASSY CN3001 (VIDEO SCR ASSY) (J1001) VR1004 (RV1004)

Video out CN3002 (J1002)

OSILLOSCOPE

Staircase signal 1Vp-p/75Ω

Terminated at 75Ω

Connection Diagram 2

47

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