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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
CX-916
4) Focus Error Amplifier
The photo-detector outputs (A + C) and (B + D) are passed through a differential amplifier and an error amplifier, and then (A + C � B � D) is output from Pin 91 as the FE signal. The FE voltage low frequency component is : 16k (80k//300k) FE = (A + C � B � D) � � 10k 20k = (A + C � B � D) � 5 Using REFO as the reference, an S-curve of approximately 1.5 Vpp is obtained for the FE output. The final-stage amplifier cutoff frequency is 11.4 kHz.
90 D/A FE OFFSET CN101 A+C 10k 6 82 83 16k 48k 110k 80k R200 300k 91 FE
C210 220pF
20k
A/D TO DIG. EQ
84 13 B+D 85 10k 16k
48k 20k
Fig.4 : FOCUS ERROR AMPLIFIER
5) Tracking Error Amplifier
The photo-detector outputs E and F are passed through a differential amplifier and an error amplifier, and then (E � F) is output from Pin 93 as the TE signal. The TE voltage low frequency component is : TE = (E � F) � 224k (56k+27k) � 80k 38k
6) Tracking Zero Crossing Amplifier
TEC signal (the tracking zero crossing signal) is obtained by multiplying the TE signal four times. It is used for locating the zero crossing points of the tracking error. The zero cross point detection is done for the following two reasons : 1 To count tracks for carriage moves and track jumps. 2 To detect the direction in which the lens is moving when the tracking is closed (it is used on the tracking brake circuit to be described later). The TEC signal frequency range is 300 Hz to 20 kHz. TEC voltage = TE level � 4 Theoretical TEC level is 5.2V. The signal exceeds Drange of the operational amplifier and thus is clipped. It, however, can be ignored since this signal is used by the servo LSI only at the zero crossing point.
C211 100pF 92 D/A TE OFFSET 110k 80k 93 TE
= (E � F) � 5.7 (Effective LSI output is 5.0). Using REFO as the reference, the TE waveform of approximately 1.3 Vpp is obtained for the TE output. The final-stage amplifier cutoff frequency is 20 kHz.
CN101 F R215 F 9 86 27k 56k 224k 48k
38k
A/D TO DIG. EQ TE2 94 20k R210 0 C212
E R216 E 11 27k 87 56k 224k 48k 38k
60k
95 TEC 6800pF
4
Fig.5 TRACKING ERROR AMPLIFIER AND TRACKING ZERO CROSSING AMPLIFIER
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