CASIO QW1643 (SM548)
Service Manual

3-2. CHECKING TERMINALS AND COMPONENTS: QW-1613 / 1643

10 .Capacitor / chip C1 (7103 3866) 5 .Coil LL2 (7020 5413)
C5 8 .Capacitor / tantalum

Di 18 .Diode

(7101 5609)
INV 6 .Inverter

(2895 1204)

9 .Capacitor / chip C4 (7103 2477)

(7100 7917)

10 .Capacitor / chip C2 (7103 3866)
CIL VDD VSS2 VDD VCH VC2 ELD CIL KI1 KI6 KI6 VDD VSS1 VC1 ELD KI1 CIL

VC1 VDD

2a .P.C.B. with components
KI7 N4

VSS2 VDD
VCPE ELD VDD VSS2 LD2 CIL RT1 VSS2 RT2 VSS2

VDD VDD VDD

(7240 9841) 2b .P.C.B. with components (7240 9840)

KI6 KI2 AC VDD VDD VSS3

VCH VSS2

VDD VCPE LD2 L RT1

N2 VDD N1

N3

RT2

VSS2 KI3

KI5

KI3

XT

XT

VDD

L

L

VSS2

KI5

XTB KI4

KI4 KI2 KI4 VDD VDD KI8

BD KI2

7 .Quartz oscillator Xtal (7110 6302) 12, 13, 14, 15, 16, 17 .Capacitor / chip C7 Select one from 6 parts. (7103 4871) (7103 5924) (7103 6561) (7103 6575) (7436 1434) (7436 1448) 10 .Capacitor / chip C3 (7103 3866)

R 19 .Resistor / Chip

(7103 7450)
Tr 3 .Transistor

(7101 1151)
C6 15 .Capacitor / chip

4 .Coil LL1 (7020 0503)

(7103 7443)

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

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

[N1~N4 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.

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