GX20
2 – 43
CONFIDENTIAL
(From page 2-42)
More than 3.6 V output at BATT terminal (TPB336)?
Battery terminal defective, adhesive foreign matter at contact
battery (CN303) terminal, or bad soldering.
Voltage of below 1.6 V applied to SENSE terminal (TPB331)?
Battery or battery mounting defective.
Is fuse (FS301) connected?
Blowout of fuse (FS301).
More than 3.6 V output at VBAT_S terminal (IC202 4 Pin),
VBAT_AP terminal (Between FS401 and FS402), VBAT_BB
terminal (IC202 22 Pin)?
•
Relay FPC_A or connector CN201 defective.
•
Parts connected to each VBAT line or mounting defective.
Voltage of below 1.6 V applied to IC102 15 pin BATT_ SENSE
terminal (C188 signal side)?
Relay FPC_A or connector CN201 defective.
Is 4-level stack memory (IC106) properly mounted?
Defective mounting of 4-level stack memory (IC106).
3.0 V output at VMEM (TP209), and 1.8 V output at VCORE
(TP207), respectively?
Power supply IC (IC202) defective.
3.0 V output at VINT (TP213)?
IC205 or jumper (IC205 5 pin to TP213) defective.
32.768 kHz properly output (at X102 connected to IC104 28
pin)?
Are appearance and mounting of R132, jumper (R132 to
C149), R147, C149, X102 and IC104 properly given?
X102 (32 kHz oscillator), R132, jumper (R132 to C149), R147
and C149 defective, or mounting defective.
Or IC104 oscillation circuit defective.
13 MHz square waves properly output at TP414?
IC102, IC103, IC403, jumper (IC102 46 pin to IC104 84 pin)
and L405 defective or mounting defective.
13 MHz triangle waves input to IC104 142pin?
IC104 defective.
13 MHz triangle waves output from IC901 36 pin?
Parts of IC901 36 pin to IC104 142 pin defective.
2.9 V output at VTCXO (TP317)?
Regulator (IC303) and C318 defective.
TCXO (TCX951), IC901 and peripheral circuit defective.
A
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
YES
NO
YES
NO
NO
YES
Содержание GX20
Страница 38: ...GX20 2 32 CONFIDENTIAL Figure 64 Contact points Figure 65 Turning power on Points Push ...
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