Changes To The Pcb Ass'y - Casio GW-002J Service Manual & Parts List

8. CHANGES TO THE PCB ASS'Y

Starting from the June 2006 production run, a change was made to the PCB ass'y.
(1-chip type → 2-chip type, as shown below)
LEDOUT
LD1 GND R1 LEDOUT
KI1
GND R3
GND R2
GND
GND R1
SCIN
GND SCR
SCIN SCIN
GND N2
GND N1
GNDB BD
KI4
GND R1
GND VSC
VSC
1-chip type
The module uses the same code changed sequentially, while a different part code is used for the PCB ass'y.
Because the 2 types of PCB ass'y are both in use, care must be taken not to use the incorrect parts during
repairs.
The 1-chip and 2-chip types, as well as using different PCB ass'y, also use different spacers and
housings. (All other components are the same.)
For PCB replacement, the replacement parts listed below are required.
PCB
1-chip type
2-chip type
* The spacer and housing each require the inclusion of a support, electrode plate (-) and battery retainer.
Because the same parts are used, the parts can be swapped in from the original module.
(However, ensure that the parts are not distorted.)
Examine the actual PCB ass'y to determine whether a 1-chip or 2-chip type assembly is used.
(No indication is provided on the product.)
When the module is replaced, the differences between the PCB ass'y are irrelevant.
LEDOUT R2
R1 VDD2 VDD2 R2
KI8 GND
GND KI9
KI5
GND KC3 KC1
KI7 KI6 KI6
KI3
VDD2
KI2
Replacement part
1-chip PCB ass'y
Or
2-chip PCB ass'y, 2914-2 spacer, 2914-3 housing
Support, electrode plate (-), battery retainer*
2-chip PCB ass'y
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LEDOUT
VDD2 R1
LEDOUT R2
R2 VDD2
LD1 GND R1 LEDOUT
KI8 GND
KI1
KC3 KI6
GND GND
KC1 KI6
GND R3 GNDB KI9
GND KI7
GND
GND R2
SCIN
GND R1
GND
SCIN SCR
VSC
GND SCIN
GND N2
KI4
GND N1
ELD
VSC GND
VSC VDD2
KI2
2-chip type
KI5
VC4
VC3
VHF
GND
KI3
VDD2