CLARION CY270
Service Manual

�ADJUSTMENT
Item FM noise convergence Clock accuracy Procedure
Measuring instrument

1. Input the 98.1MHz/55dBμ(1kHz 30% MOD) signal. SSG 2. Adjust the outputs to �18±3dB by VR102 when the SG output is set to �20dBμ. AC volt meter 1. Turn off and on the ACC switch twice, while holding the buttons of power switch and CD eject to make the unit the test mode. 2. Set a universal timer to TP101(T-BASE), adjust TC201 so that a reading of the meter is 0±0.1 sec./day. Chronometer

�EXPLANATION OF IC
052-1163-20 uPD178076GF-540-3BA
1.Terminal Description pin 1: EJECT SW pin pin pin pin pin pin pin 2: NU 3: NU 4: VOL DATA 5: VOL CLK 6: VOL CE 7: NU 8: LCD DI

CD & Radio System control
pin 48: NU pin 49: IC pin 50: RESET pin 51: NU pin 52: NU pin 53: ST/TWEET pin 54: CLK INT pin 55: AUX ON pin 56: TEST pin 57: LCD ON pin 58: NU pin 59: BEEP pin 60: NU pin 61: NU pin 62: CD RESET pin 63: NU pin 64: AF MUTE pin 65: NU pin 66: FM ON pin 67: AM ON pin 68: CD ON pin 69: NU pin 70: NU pin 71: NU pin 72: RF MUTE pin 73: DX/LO pin 74: SYS ON pin 75: AMP ON pin 76: COMBI ON pin 77: NU pin 78: ACC IN pin 79: RADIO ON pin 80: NU pin 81: SBSY pin 82: GND pin 84: BUS 0 pin 85: BUS 1 pin 86: BUS 2 pin 87: BUS 3 pin 88: BUS CK pin 89: CCE pin 90: GS1 TEST pin 91: S STOP pin 92: CHU SW pin 93: TR B pin 94: TR A pin 95: LD CONT pin 96: LD MUTE pin 97: NU pin 98: BAND SEL pin 99: VDD pin100: GND : - : Not in use. : IN : Connected to the ground. : IN : Reset signal input. : - : Not in use. : - : Not in use. :I/O: Outputs "L" at AM 900kHz receiving. Inputs "L" at FM stereo receiving. : IN : Without a clock = "H". : IN : AUX ON signal input. : - : For the Test. : O : LCD back light ON signal output. : - : Not in use. : O : Beep out. : - : Not in use. : - : Not in use. : O : The reset pulse output to the CD IC. : - : Not in use. : O : Audio frequency signal muting. : - : Not in use. : O : FM ON signal output. : O : AM ON signal output. : O : CD ON signal output. : - : Not in use. : - : Not in use. : - : Not in use. : O : Radio frequency signal muting. : O : DX/Local select signal output. : O : System ON signal output. : O : Audio power amplifier ON signal output. : O : Combi ON signal output. : - : Not in use. : IN : ACC detection signal intput. : O : Radio ON signal output. : - : Not in use. : IN : Sub code sync input. : - : Ground. :I/O: CD IC Data input / output. :I/O: CD IC Data input / output. :I/O: CD IC Data input / output. :I/O: CD IC Data input / output. : O : Clock pulse output to the CD IC. : O : The chip enable signal output. : O : Test data output. : IN : In side limit signal input. : IN : CD disc chucking signal input. : IN : Photo sensor signal input from the CD mechanism. : IN : Photo sensor signal input from the CD mechanism. : IN : Loading control signal input. : O : Muting signal output to the CD mechanism. : - : Not in use. : IN : Band selection input. : - : Positive supply voltage. : - : Ground.

: IN : Eject switch ON signal input. : - : Not in use. : - : Not in use. : O : The serial data output to the volume IC. : O : The clock pulse output to the volume IC. : O : The chip enable signal output to the volume IC. : - : Not in use. : IN : The srial data input from the LCD driver. : O : The srial data output to the LCD driver. : O : The clock pulse output to the LCD driver. : O : The chip enable signal output to the LCD driver. : - : Not in use. : IN : Power switch ON signal input. : IN : Volume control pulse input from the rotary encoder. : IN : Volume control pulse input from the rotary encoder. : IN : Illumination ON signal input. : - : Not in use. : - : Not in use. : - : Not in use. : - : Not in use. : - : Not in use. : - : Not in use. : - : Not in use. : - : Not in use. : - : Not in use. : - : Not in use. : - : Positive supply voltage for the Analog section. : - : Not in use. : - : Not in use. : - : Not in use. : - : Not in use. : - : Analog ground. : IN : The capacitor connection terminal to suppress the ripple. : - : Positive supply voltage. : IN : The capacitor connection terminal to suppress the ripple. : - : Crystal connection. : - : Crystal connection. : - : Ground. : - : Not in use. : - : Ground. : IN : Input terminal of the internal universal counter for AM IF. : IN : Input terminal of the internal universal counter for FM IF. : - : Positive supply voltage for the PLL. : IN : Input terminal of the internal counter for FM OSC( Local Oscillation ). : IN : Input terminal of the internal counter for AM OSC( Local Oscillation ). : - : Ground for the PLL. : O : PLL error output.

pin 9: LCD DO pin 10: LCD CLK pin 11: LCD CE pin 12: NU pin 13: POWER SW pin 14: VOL 1 pin 15: VOL 2 pin 16: ILL pin 17: NU pin 18: NU pin 19: NU pin 20: NU pin 21: NU pin 22: NU pin 23: NU pin 24: NU pin 25: NU pin 26: NU pin 27: A VDD pin 28: NU pin 29: NU pin 30: NU pin 31: NU pin 32: A VSS pin 33: REG CPU pin 34: VDD pin 35: REG OSC pin 36: X 2 pin 37: X 1 pin 38: GND pin 39: NU pin 40: GND pin 41: AM IF pin 42: FM IF pin 43: VDD PLL pin 44: FM OSC pin 45: AM OSC pin 46: GND PLL pin 47: Voltage Tune

pin 83: CD CONNECT : IN : CD connection check signal input.

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PN-2445M