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PIONEER XR-A370/NVXJ
Service Manual


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

Description of PIONEER XR-A370/NVXJ 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 63 (click to view)
XR-A670, XR-A370

6.2.2 For XR-A370
� Adjustment points and test points are shown in Fig.10, Fig.12 and Fig.13.

Mechanical Adjustment
� Test tape : NCT-111 (3kHz, 30min).

1. Tape Speed Adjustment
No. Mode Test Tape Adjusting Points Measurement Points
TAPE TEST POINT (Rch) (AF Assy)

Adjustment Procedure
Press the PLAY SW and adjust so that the reading becomes 3000Hz ± 20Hz. Confirm that wow & flutter level is below 0.3% (in the reverse direction, confirm that the reading is within 3000Hz ± 60Hz).

Remarks

1

Deck � PLAY

ADJ. VR on NCT-111 CASSETTE (Playback : 3kHz) MECHA (Fig. 10)

Tape Speed ADJ. VR AF Assy Front Side Cassette Mechanism Section (Side View)

Fig.10 Tape Speed ADJ. Point

Electrical Adjustment
Check the following before starting.
(1) Confirm that the tape speed adjustment has been completed. (2) Clean the heads and demagnetize them using a head eraser. (3) Set the measurement level to 0 dBV = 1 Vrms. (4) Use the specified tape for adjustment. Use the labeled (A) side of the test tape. STD-331E : For playback check STD-632 : Normal blank tape (5) Provide yourself with the following measuring devides: � AC voltmeter (Noisemeter : filter off) � AC millivoltmeter � Low-frequency oscillator � Attenuator � Oscilloscope (6) Adjust both right and left channels unless otherwise specified. (7) Warm up the unit for several minutes before adjustment. In particular, be sure to warm up the unit in the REC/PLAY mode for 3 to 5 minutes before starting recording/playback frequency characteristics adjustment. (8) Always follow the indicated adjustment order. Otherwise, a complete adjustment may not be achieved.

Playback Adjustment (Decks � and ��)
(1) Head Azimuth Adjustment

Recording Adjustment (Deck �)
(1) Bias Oscillation Frequency Adjustment (2) Recording Bias Adjustment � As the reference recording level is 250nwb/m for STD-331E, the recording level will be higher by 4 dB for STD-331B (160nwb/m). When adjusting, pay carefull attention to the type of tape used.

0 dB 30s 315Hz

0 dB: 315 Hz, 250 nwb/m 30s 6.3kHz 30s 10kHz 30s 315Hz 10s ......................................................................................................... 10s �20 dB 12.5 6.3 500 250 125 14kHz kHz 10kHz 8kHz kHz 4kHz 2kHz 1kHz Hz Hz Hz 63Hz 40Hz 10s

Fig.11 STD-331E Test Tape 63

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