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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)
GND
VSC
KI5
LEDOUT
R2
VDD2
R1
VDD2
R2
LEDOUT
R1
LD1
GND
LEDOUT
R1
BD
KI9
GND
GNDB
KI3
KI1
GND
GND
KC1
KI6
GND
VSC
VDD2
GND
KI8
GND
GND
SCR
SCIN
GND
KC3
KI7
GND
N1
SCIN
N2
KI6
R3
R1
GND
R2
GND
SCIN
KI4
KI2
R1
R2
KI2
VDD2
GND
R2
VDD2
SCIN
VDD2
GND
KC3
KC1
GND
KI6
KI7
KI6
KI9
VSC
GND
VHF
VC3
VC4
SCIN
GND
GNDB
GND
VSC
KI5
GND
ELD
KI1
LEDOUT
R1
LEDOUT
LD1
LEDOUT
GND
SCR
VDD2
GND
KI8
R2
GND R1
GND
R3
GND
N2
N1
GND
GND
GND SCIN
KI4
KI3
VSC
2-chip type
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
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
* 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.