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I was searching a way to modify the original phono-in entry (for connection of vynil disc player, with RIAA equalization) to a line-in entry (for connection of modern analog entries, eg. ipod, mp3player).
This service manual gave me the correct hints.
It contains very useful infos for repairing and modifing the hi-fi, such as disassembling instructions, block diagrams, schematic diagrams, PCB prints, replacement parts list.
Very good!
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Great Job!!! clear and efficient as always!!
it is really nice to have peple that are doing such a good work!!!!!
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I must admit, I was very skeptical... $4.99 for a 74 page service manual. I've seen some very poorly scanned manuals on the Internet, but this one is VERY good quality! Even when zooming into 500%. Great Deal!
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Very good detail, Quick service response. A useful service manual with all details. I recomend this service.
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As Always you can find here manuals even of difficult TV scheme which are scan in almost perfect way.clear and fast!!!!!
Great work thanks!
1-A. Preliminary/Final Checking and Alignment of Tape Path
Purpose: To make sure that the tape path is well stabilized. Symptom of Misalignment: If the tape path is unstable, the tape will be damaged. Note: Do not use an Alignment Tape for this procedure. If the unit is not correctly aligned, the tape may be damaged. 1. Play back a blank cassette tape and check to see that the tape runs without creasing at Guide Rollers [2] and [3], and at points A and B on the lead surface. (Refer to Fig M3 and M4.) 2. If creasing is apparent, align the height of the guide rollers by turning the top of Guide Rollers [2] and [3] with a Guide Roller Adj. Screwdriver. (Refer to Fig. M3 and M5.) Note: Beneath each Guide Roller, there is a small screw. (Refer to Fig. M5.) This screw works
Guide Roller [2] Guide Roller [3]
to apply adequate torque to the shaft of each Guide Roller so that the Guide Roller turns properly. Even when adjusting the height of the Guide Roller(s), do not touch these two small screws. 3. Check to see that the tape runs without creasing at Take-up Guide Post [4] or without snaking between Guide Roller [3] and AC Head. (Fig. M3 and M5) 4. If creasing or snaking is apparent, adjust the Tilt Adj. Screw of the AC Head. (Fig. M6)
Azimuth Adj. Screw
AC Head X-Value Adj. Screwdriver
Tilt Adj. Screw
Fig. M6
AC Head
1-B. X Value Alignment
Purpose:
A B Take-up Guide Post [4]
To align the Horizontal Position of the Audio/Control/Erase Head. Fig. M3 Symptom of Misalignment: If the Horizontal Position of the Audio/Control/Erase Head is not properly aligned, maximum envelope cannot be obtained at the Neutral position of the Tracking Control Circuit. 1. Connect the oscilloscope to TP301 (C-PB) and TP303 (CTL) on the Main CBA. Use TP302 (RFSW) as a trigger.
Lead Surface of Cylinder
Tape
Fig. M4
2. Play back the Gray Scale of the Alignment Tape (FL8NW) and confirm that the PB FM signal is present. 3. Set the Tracking Control Circuit to the center position by pressing the CH UP button then the PLAY button on the VCR. (Refer to note on bottom of page 2-3-4.) 4. Use the X-Value Adj. Screwdriver so that the PB FM signal at TP301 (C-PB) is maximum. (Fig. M6) 5. Press CH UP button on the VCR until the CTL waveform has shifted by approx. +2msec. Make sure that the envelope is simply attenuated (shrinks in height) during this process so that you will know the envelope has been at its peak.
Correct
Guide Roller Tape Small Screw Take-up Guide Post Tape
Incorrect
Fig. M5 2-3-3 H7800MA
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