Pioneer CRT2624_CX-977 free download

File name CRT2624_CX-977.pdf

Service Manual CD MECHANISM MODULE ORDER NO. CRT2624 CX-977 - This service manual describes the operation of the CD mechanism module incorporated in models listed in the table below. - When performing repairs use this manual together with the specific manual for model under repair. Model DEH-P630/X1N/UC DEH-P7300R/X1N/EW DEH-P730/X1N/UC DEH-P7350/X1N/ES Service Manual CRT2648 CRT2649 CRT2650 CRT2651 CD Mechanism Module CXK5500 CONTENTS 1. CIRCUIT DESCRIPTIONS ...2 2. MECHANISM DESCRIPTIONS...26 3. DISASSEMBLY ...28 PIONEER CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS SERVICE INC. P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A. PIONEER EUROPE NV Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936 C PIONEER CORPORATION 2001 K-ZZA. MAR. 2001 Printed in Japan CX-977 1. CIRCUIT DESCRIPTIONS From divisional viewpoint, the CX-977 is roughly divided into four sections, namely, Preamplifier, Servo, Power Supply and Loading Control. This LSI realizes eight types of automatic adjustments (controls) through cooperative work between Preamplifier and Servo unit. Because the system uses the single power source (+ 5v) specification, reference voltages used in the servo system (Preamplifier, Servo DSP and Pickup) are all Vref (2.1V). 1.1 PREAMPLIFIER (TA2153FN; IC101) The Preamplifier processes output signals sent from the Pickup and generates signals to supply to each unit of the next stage, that is, Servo, Demodulator or Control. It also performs power control of Pickup's laser diode. Signals from the Pickup are I-V-converted by the Preamplifier, which is built-in in Pickup's photo detector, and then added-up by the RF amplifier to obtain signals such as RF, FE and TE. Reference voltage, Vref (2.1v), is output from #19 pin of the IC, and 2Vref (4.2v) is supplied to the Servo DSP as the reference voltage to determine its D range of A/D input. Fig. 1: TA2153FN circuit 2 CX-977 1) Focus Error Amplifier unit In this sub-unit, outputs from the photo detector, namely, (A+C) and (B+D), are processed in the differential amplifier and further in the error amplifier, and then, (A+C-B-D) is output as FE signal from #16 pin of IC101 (TA2153FN). Low frequency component of voltage FE is expressed as: FE = (A+C-B-D) x (150k/(51k+1k)) x (60k/60k) x (120k/60k) = 5.77 times In FE output, "S" curve of approximately 1.45 Vpp on the basis of Vref is obtained. The cutoff frequency of the succeeding amplifier is 11.4 kHz. Fig. 2: FE circuit 2) Tracking Error Amplifier unit In this sub-unit, outputs from the photo detector, namely, E and F, are processed in the differential amplifier and further in the error amplifier, and then, (E-F) is output as TE signal from #14 pin of IC101 (TA2153FN). Low frequency component of voltage TE is