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A site where discontinualed schematic diagrams and back dated information can be found on discontinued radios tv's and any electronic equipment can be found. Newer manuals either Service and operating manuals. Radio amateurs should find this site a great source for ham radio equipment manuals. I will return to this site should I need information on any electrical equipment. priced easy to download in a PDF format and print pages need to undertake the repair.
Quality scan of the original. All the detail necessary to troubleshoot, repair and adjust the unit. I'm sure I will be downloading more manuals in the future as the need arises.
Exactly as described, a Service Manual complete with the schematics and PCB layout delivered in a timely manner. Many thanks for the great service.
some of the writing is a bit blur but the part in the schmatic was great and i have fixed the machine thanks
Well.. I'd searched for this manual and although I found many copies online I was pleased to find your website with a well balanced pricing system and easy to search and follow links. That together with the very quick response time was just what I was looking for.. being a very impatient tech.. ;-) I had the service manual in front of me within a short time.
Bookmarked.. and you can bet I will always come here first for my service & user manuals..
2.18.3 Linearity adjustment The following flowchart shows the linearity check/adjustment procedure.
Connect an oscilloscope (CH: + Slope) and, while triggering it with the HID signal, observe the ENV OUT waveform.
2.18.4 PB switching point adjustment The following flowchart shows the PB switching point adjustment procedure. Load the alignment tape.
Play the alignment tape, then set âATFâ (Auto Tracking Find) in âDeck Controllerâ of the SSS Software to ON. (Note 3)
The âPB Switching Pointâ in the Adjustment Utility of the SSS software is adjusted automatically.
Ensure that the ENV OUT waveform is linear and parallel, without a noticeable drop or variation in the overall level. If the waveform linearity is poor or there is a noticeable drop in level, adjust the guide roller by turning it with the roller driver.
2.18.5 Error rate adjustment The following flowchart shows the error rate adjustment procedure.
Record a color bar signal for about 5 minute s. (Note 6)
Set âATFâ (Auto Tracking Find) to OFF using âDeck Controllerâ of the SSS Software (Note 4). Observe the ENV OUT waveform to confirm that the overall waveform balance and linearity levels vary in accordance with the tracking variation as shown in Fig. 2-18-3. Repeat above steps as required. Is the PB ENV waveform ideally stable and does it vary ideally according to the tracking variation?
While playing the recorded signal, adjust âVCO Center Frequency (ME SP)â or âVCO Center Frequency (ME LP)â in âDeck Sectionâ of the Adjustment Utility. To adjust VCO Center Frequency (ME SP) : Set Viterbi OFF. To adjust VCO Center Frequency (ME LP) : Set Viterbi ON.
Yes The linearity adjustment is complete if the PB ENV waveform is ideally stable and varies ideally according to the tracking variation. To close, play a prerecorded tape and check the audio and video.
Is the obtained error rate minimum (almost the typical value)?
The error rate adjustment is complete when the minimum error rate which is no higher than the typical value is obtained. (Note 5)
Note 5 : â¢ The âtypical valueâ refers to the following: CH1 or CH2: < 498.; with Viterbi OFF. Inter-channel difference: < 10 times between CH1 and CH2. Note 6 : â¢ It is desirable to use a brand-new tape or an unused section of tape. This is to assure the adjustment reliability because using a damaged tape increases the error rate.
PB ENV waveform
Adjust variation in the parallelism
Fig. 2-18-4 PB ENV Waveform Note 3 : â¢ The VHS section has an A/C head, and the first tracking position can be locked using the CTL pulse and drum FF when AT is off. Therefore, the linearity of the VHS section can usually be adjusted with AT off. However, this adjustment method is not available with the DV section, which does not have the A/C head. If ATF is turned off, the DV section performs tracking only of the speed system. Therefore, as time passes, the servo will be lost and the linearity adjustment will become difficult. Note 4 : â¢ Since the speed servo function is active when ATF is off, there will be no problem even if the DVC ATF function is off, provided that it is for a few minutes.
2.18.6 Error rate measuring method It is not necessary to use the error rate jig (YTU93083) or a frequency counter. The Service Support System Software displays the error rates of video CH1, CH2 and totals. When measuring the error rate of a channel, be sure to total the values of the video and the audio errors.
Complete owner's manual in digital format. The manual will be available for download as PDF file aft…