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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
KRC-33R,378R/RY,480R
CIRCUIT DESCRIPTION
(X14-) IC1 :
PORT No. 41 42-44 45 46 47
-COM
I/O O O O O O O I O O O O O I I I I I I I I I I I I I I FUNCTION Noise detection time constant switch. Mute signal output to the power IC (IC4). SVR signal output to the power IC (IC4). Stand-by signal output to the power IC (IC4). Control signal output to P-CON or P-ANT. Buzzer signal output. ACC detection signal input. Back-up voltage detection signal input. Request signal output to the changer. Changer control. SW 5V power control signal output. P.ON power supply control signal output. System reset signal input. Data input from the remote controller. Data clock input from RDS decoder . Request input signal from the changer. Insertion detection signal input from cassette mechanism. Key request. Tape-end detection signal input from cassette mechanis. GND. Power supply. For main system clock oscillation. For main system clock oscillation. For flash memory writing. Power supply. Power supply. 5V power supply (For A/D converter reference voltage). S-meter voltage input from the front-end. Tape mode input from cassette mechanism. Phone (Tel-mute) voltage input. Voltage input from E-volume (IC2)�s noise amplifier. Destination switching.
OPERATING CONDITION
PORT NAME AFC N.C. P-MUTE
SVR
"L" : FM seeking. "H" : The other condition. "L" : Power IC (IC4) mute. "L" when P.ON goes down. "H" : Power IC (IC4) "ON". "L" : Power IC (IC4) "OFF". "H" : P-CON signal output "ON". "L" : P-CON signal output "OFF". Beep sound output. "H" : ACC "OFF". "L" : ACC "ON". "H" when back-up signal does not exist. "L" when back-up signal exists. "L" : Request. "H" : Changer mode. "L" : The other mode. "L" : SW 5V "ON". "H" : Power "ON". "L" : Reset. "H" : Pack in. Active "L". "H" : Tape running. "H" : SD signal exists. "L" : SD signal does not exist. Vth : Fit the new front-end. Vth : 2.5V. Tel mute : More than 1V. Navi mute : Less than 2.5V. "H" : KRC-478RV/RYV. "L" : The other models. "L" : Tape-end. "L" : Pack out. "H" : The other condition. "L" : Power "OFF".
STBY P-CON N.C. BEEP ACC-DET BU-DET CH-REQ H CH-CON N.C. SW5 P.ON RESET REMOTE R-CLK CH-REQ C PACK IN KEY-REQ T-END VSS 0 VDD 1 X2 X1 IC/TEST XT2 VDD 0 VDD 0 AV REF 0 S-METER T-MODE PHONE NOISE TYPE 0
48 49 50 51 52 53 54 55 56 57 58,59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
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