Casio QV-770 Spezifikationen PDF herunterladen (Seite 19)

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VCC3, VCC5 voltage check PCB-LA

• Voltage supply

CP151 = 5.0 ± 0.05 V.

(You can use an AC adaptor however, for the checking after repairs, apply above mentioned voltages.)

(1) Apply 5.0 ± 0.05 V to CP150.

(2) Make sure VCC3 (CP160) is 3.3 ± 0.1 V and VCC5 (CP152) is 5.0 ± 0.15 V.

VCC2 adjustment and VCC7, VCC8, VEE2 voltage check

• Voltage supply

VCL0(CP101)=5.0±0.05V.

(You can use an AC adaptor however, for the checking after repairs, apply above mentioned voltages.)

(1) Apply 5.0 V ± 0.05 V to VCL0 and adjust VR100 so that VCC2 will be 5.0 ± 0.02 V.

Notes: • VCC7 = 7.3 ~ 8.3 [V], VCC8 = 12.0 ~ 14.0 [V]

• VEE2 = –12.3 ~ –16.7 [V]

In addition, disconnect the power and make sure all output voltages are 0 V.

VCO free run frequency adjustment

• Voltage supply

VCC2=5 V ± 0.05 (V) (CP181).

VCC8 = 13.5 ± 0.05 (V) (CP180).

VEE2 = –15.0 ± 0.05 (V) (CP182).

Connect CP705 (CSY) and CP700 (GNP).

(You can use an AC adaptor however, for the checking after repairs, apply above mentioned voltages.)

(1) Monitoring CP710 (HDB) with a frequency counter, adjust VR720 so that the frequency will be 15.734

± 0.1 [KHz].

Notes: • Disconnect CP705 and CP700, then connect PCB-LA and make sure CP705 (CSY) and CP710

(HDB) are synchronized.

• Keep room temperature at 20 ± 10°C.

PCB-LB

(CP710)

(CP705)

VEE2

CSY

oscilloscope

frequency

counter

CSY

HDB

PCB-LA

(CP705)

PCB assy

(CP181)

Power suppry

(CP180)

(CP182)

VCC8

VCC2

QV-770

HDB

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 45 46

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