CASIO QW1756 (SM543)
Service Manual

3-2. CHECKING TERMINALS AND COMPONENTS: MODULE QW-1746/1756

V DD

Di 11. Diode (7101 5609) C5 7. Tantalum capacitor (2895 1204) R 12. Chip resistor (7102 7737) 26. Insulation sheet 1726-1 (7233 2107)

C1 8. Chip capacitor (7103 3866) LL2 4. Coil (7020 5931)
VSS2 CI L EL D

INV 5. Inverter IC (7100 7917)

CI L

EL D CI L VSS2 VDD O1 KI1 KI2 VSS2 KI2

VC2
V S

VDD VC1

VSSM VCPE RT2 KI6

V SS 2

RT 1

KI1 VSS2 L KI6 BD VCH LD1

P. C. B. with components 1a. (7240 9669) QW-1746 1b. (7240 9655)

O1

EL D VCPE VCCE GND ENB CI L RT 1 GND RT2 GND P1 KI8 P2 P3 P4 VDD

VCH L KI5

QW-1756
VDD KI7 VDD XTB VDD KI4 AC VDD

VSSM VSSM

P5 KI5

VSSM XT VSS1 VSS3

C4 9. Chip capacitor (7103 7163) C6 10. Chip capacitor (7103 7443) C3 8. Chip capacitor (7103 3866)

L

L 3. Coil (7020 0236) Tr1 2. Transistor (7101 1151)
S 2

C2 8. Chip capacitor (7103 3866) Xtal 6. Quartz oscillator (7110 0715)

Top view of P.C.B. ass'y

Bottom view of P.C.B. ass'y

3-3. ACCURACY SETTING SYSTEM
The accuracy of this module is set by Pattern Cutting method (P1 ~ P5) in the production line. Therefore, in case a trouble occurs in the quartz oscillator or the LSI, replace the whole P.C.B. with components with new one.

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