CASIO QW1455 (SM523)
Service Manual

[ CHECKING TERMINALS AND COMPONENTS ]
C5 11. Chip capacitor (7103 7443) LL1 5. Coil (for alarm) (7020 0511) R 12. Chip resistor C4 9. Tantalum capacitor (2895 1358) C1 10. Chip capacitor (7103 4446)
VDD VBAT1 VC VCC VDD S4 AC VDD

Tr 3. Transistor (7110 1151)
VBAT1

(2797 3129)

L L VDD BD RT2 RT1 S4

L

ELD

2. P.C.B. with components (7240 9039)
VDD

VCPE VBAT1 VBAT1 VBAT1 CIL ELD VSS1 VDD VBAT1 RT1 CIL S4 VBAT1 VDD ELD VCPE CIL ELD

S3

S1

S1 VSS2

VSS2

VDD

CIL

S3

VDD

VSS1 N1

N2 N3 VDD VDD VDD

CG3

CG2

CG1 XT VDD

INV 7. Inverter IC (7100 7917) LL2 6. Coil (for EL) (7020 5413) 24. Cushion 6 (7211 0064)

XT

XT

XT

Di 4. Diode (7101 5609)

XTB

C2 10. Chip capacitor (7103 4446)

Xtal 8. Quartz oscillator (7110 0979)

C3 10. Chip capacitor (7103 4446)

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

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

[SPECIFICATIONS]
Item Battery Battery life Alarm system CR1216 Approx. 2 years Piezo plate on Back cover Detail Accuracy Accuracy setting system Accuracy checking Accuracy setting Item Detail ±30sec./month Pad selection (CG1~CG3) See page 6 Unadjustable

Current consumption 1.20µA maximum

[N1~N3, CG1~CG3 PADS]
Never solder or desolder these pads, because they have been selected best in the production line. A new P.C.B. with components as a spare parts will be supplied with factory adjustment of these pads.

�3�

VBAT1 RT2