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Theory
91369 Service Manual
3-22
CPU PCBA Jumpers
The CPU PCBA also has several jumpers for various configuration and testing purposes. These are
summarized in
.
I/O PCBA Connectors
Table 4: CPU PCBA Jumpers
Reference
Description
Default
Configuration
Comments
P040
Fan
Open
No jumper
P100
Power input
Open
No jumper
P200
Battery connector
Open
No jumper
P250
Display voltage
1-2
1-2 — Color TFT/EL
2-3 — Color TFT
Open
5 V display
3 V display
Display disabled
P410
Battery charger debug
1-2
1-2 — Normal operation
P412
Open
2-3 — Debug mode
Open
Charger OFF
P590
Onboard USB
Open
Not used, no jumper
P710
PLD programming
header
JTAG programming
P750
CPU reset
configuration
1-2
1-2 — Initial PCBA code loading
2-3 — Normal operation
Pulls RSTCONF# high
Pulls RSTCONF# low
P990
SuperCap discharge
Open
Open — Normal operation
Closed — Discharges SuperCap
Table 5: I/O PCBA Connectors
Reference
Connector Type
Description
Internal/External
P1
9-pin D
SDLC
External
P2
DB9
RS-232 serial interface
External
P3
DB15HD
Video output
External
J3
14-pin D
Alarm relay
External