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Service Manual ORDER NO. CRT2307 MULTI-CD CONTROL HIGH POWER CASSETTE PLAYER WITH FM/AM TUNER KEH-P7850 X1N/ES NOTE: - See the separate manual CX-631(CRT1640) for the cassette mechanism description. - The cassette mechanism assy employed in this model is one of 2L series. - Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation. "Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation. CONTENTS 1. SAFETY INFORMATION ...2 7. GENERAL INFORMATION ...38 2. EXPLODED VIEWS AND PARTS LIST...2 7.1 PARTS...38 3. SCHEMATIC DIAGRAM ...10 7.1.1 IC ...38 4. PCB CONNECTION DIAGRAM ...20 7.1.2 DISPLAY ...43 5. ELECTRICAL PARTS LIST ...30 7.2 DIAGNOSIS...44 6. ADJUSTMENT ...36 7.2.1 DISASSEMBLY ...44 7.2.2 TEST MODE ...45 7.3 BLOCK DIAGRAM...48 8. OPERATIONS AND SPECIFICATIONS ...49 PIONEER ELECTRONIC 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 ELECTRONIC [EUROPE] N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936 C PIONEER ELECTRONIC CORPORATION 1998 K-ZZS. NOV. 1998 Printed in Japan KEH-P7850 1. SAFETY INFORMATION This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair comp