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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.
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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.
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Exactly as described, a Service Manual complete with the schematics and PCB layout delivered in a timely manner. Many thanks for the great service.
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some of the writing is a bit blur but the part in the schmatic was great and i have fixed the machine thanks
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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..
best regards
Ed(Tony) Foley
G7WHK
2. AUDIO CONTROL HEAD TILT ADJUSTMENT
Purpose: To confirm that the tape runs smoothly. In particular, confirm that the tape properly picks up the Audio Signal at the upper part of the head and the Control Signal at the lower part of the head. Symptom of Misadjustment: If the tilt of the Audio Control Head is poorly adjusted, the tape will eventually be damaged. An intermittent Blue screen may be seen in Playback. 1. Play back a T120 cassette tape and check that the tape travels smoothly between the upper and lower guides of the P4 post. 2. If necessary, adjust Black Screw (B) clockwise until the tape begins to curl at the lower edge of the P4 post. Then adjust the screw counterclockwise until the curling is eliminated.
Tape Running Condition Audio Control Head in Tilted Condition Direction to turn for Correction
Black Screw (B) Black Screw (C)
Black Screw (A) Control Head Lower Edge of Tape 0.25mm
Lower Edge of Control Head Fig. M8
4. AUDIO CONTROL HEAD AZIMUTH ADJUSTMENT
Purpose: To adjust the position and height of the Audio Control Head so that it meets the tape tracks properly. Fig. M7 Symptom of Misadjustment: If the position of the Audio Control Head is not properly adjusted, the Audio S/N Ratio is poor. 1. Connect the oscilloscope to the TP4002 on the Main C.B.A. 2. Play back the 6kHz Monaural Audio portion of the alignment tape. 3. Adjust Black Screw (C) on the Audio Control Head base so that the output level is at maximum.
3. AUDIO CONTROL HEAD HEIGHT ADJUSTMENT
The height of the Audio Control Head replacement part is preset at the factory. Purpose: To be sure the tape runs properly along the Control Head. Symptom of Misadjustment: If the control signal is not properly picked up, Servo Operation cannot be achieved. A Blue screen will be seen in Playback. This confirmation is required when the Audio Control Head is replaced.
6KHz-Audio
Maximum
Fig. M9 1. Play back a T120 cassette tape and check that the lower edge of the tape runs approximately 0.25 mm above the lower edge of the Audio Control Head. 2. If necessary, adjust Black Screws (A) and (B) clockwise to lower the tape or counterclockwise to raise. 4. Confirm the height of the Audio Control Head is proper. If not, readjust Black Screws (A) and (B).
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