Everything in the manual was excellent except for a couple of pictures of specific areas in the unit that were a little dark. Owners Manuals re-sent the pdf file & the problem was corrected. Excellent product! George
This is the original manufacturers service manual, with detailed info on the circit boards, explosion drawings of all parts in assembly order, and tuning instructions. The only thing missing is the information on the dimensions of the various drive belts. mail me if you need them. gcrossman_at_aol.com
This is a high quality manual with clear schematic and components layout diagrams ; with service procedure included.
Text excerpt from page 6 (click to view)
MICROCOMPUTER'S TERMINAL DESCRIPTION
UPD703033GC050 (IC1: X14)
Pin 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Name F-REEL N.C SRM-DET NOISE S-METER R-DATA R-QUAL IFC-OUT MUSIC PACK-DET DOLBY R-CLK CH-REQC KEY REQ N.C EQ-MUTE MTL BU-DET CH-DATAC CH-DATAH CH-CLK L DATAL L DATAS L CLK N.C I/O I I I I I I I I I I O I I I I O O I I O I/O I I/O I/O O Purpose Cassette mechanism reel pulse input (FWD). No connection. SRM mechanism detection. FM noise detection terminal. Signal meter detection terminal. RDS decoder DATA input terminal. RDS decoder QUAL input terminal. F/E IFC OUT input terminal. Music blank detection input. Cassette mechanism pack detection terminal. Dolby ON/OFF switching. RDS decoder CLK input terminal. Request input from CH. Communication request from LCD driver. No connection. EQ muting switching. NORMAL/METAL switching. Momentary power down detection terminal. DATA input terminal from CH. DATA output terminal to CH. CLOCK input/output terminal from/to CH. DATA line from LCD driver. DATA line to LCD driver. CLK line to LCD driver. Outputs Low. No connection. Operation Description Vth = 2.5 V. Connected to GND. SRM mechanism detected: L. Model without RDS: Connected to GND. Model without RDS and RBDS: Connected to GND. Model without RDS and RBDS: Connected to GND. Station detected: L. Music signal detected: L. Music signal not detected: H. Cassette pack detected: L. Cassette pack not detected: H. ON: H. OFF: L. Model without RDS and RBDS: Connected to GND. ON: L. Connected to GND. During TAPE PLAY: L. During TAPE FF/REW: H. Other than TAPE input: H. NORMAL: H. METAL: L. Back-Up detected: L. Back-Up not detected (momentary power down): H.