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MAGNAVOX MK14
Service Manual


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

Description of MAGNAVOX MK14 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 9 (click to view)
5. To shift the CTL waveform, press [CH UP] or [CH DOWN] buttons on the unit. Then make sure that the maximum output position of PB FM envelope signal becomes within ±2ms from preset position.

5. When Guide Rollers [2] and [3] (Refer to Fig. M3) are aligned properly, there is no envelope drop either at the beginning or end of track as shown in Fig. M9.

Good
FM envelope signal 2ms Center Position

Dropping envelope level at the beginning of track.

Fig. M8
FM envelope output signal is adjusted at maximum. CTL signal

No Good

Dropping envelope level at the end of track.

FM envelope output signal is low.

Fig. M7
6. Set the Tracking Control Circuit to the preset position by pressing [CH UP] button on the unit and then [PLAY] button on the unit.

Fig. M9

1-C. Checking/Adjustment of Envelope Waveform
Purpose: To achieve a satisfactory picture, adjust the Guide Rollers so that the PB FM envelope becomes as flat as possible. Symptom of Misalignment: If the envelope output is poor, noise will appear in the picture. The tracking will then lose precision and the playback picture will be distorted by any slight variation of the Tracking Control Circuit. 1. Connect the oscilloscope to TP (C-PB) on the Main CBA. Use TP (RF-SW) as a trigger. 2. Playback the Gray Scale on the Alignment Tape (FL8NW). Set the Tracking Control Circuit to the preset position by pressing [CH UP] button on the unit and then [PLAY] button on the unit. Adjust the height of Guide Rollers [2] and [3] (Fig. M3, Page 2-3-3) watching the oscilloscope display so that the envelope becomes as flat as possible. To do this adjustment, turn the top of the Guide Roller with the Guide Roller Adj. Screwdriver. 3. If the envelope is as shown in Fig. M7, adjust the height of Guide Roller [2] (Refer to Fig. M3) so that the waveform looks like the one shown in Fig. M9. 4. If the envelope is as shown in Fig. M8, adjust the height of Guide Roller [3] (Refer to Fig. M3) so that the waveform looks like the one shown in Fig. M9.

Envelope is adjusted properly. (No envelope drop)

Fig. M10
Note: Upon completion of the adjustment of Guide Rollers [2] and [3] (Refer to Fig. M3), check the X Value by pushing the [CH UP] or [CH DOWN] buttons on the unit alternately, to check the symmetry of the envelope. Check the number of pushes to ensure preset position. The number of pushes of the [CH UP] button to achieve 1/2 level of envelope should match the number of pushes of the [CH DOWN] button from center. If required, redo the âX Value Alignment.â

2-3-4

N2461FLMA

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