Sharp 802SH Service Manual page 34

802SH
2. Voice transmission/recording is impossible.
Built-in microphones 1 and 2
Is 2.2 V or more applied to TP1601 and
TP1603?
YES
C1633, C1634, R1661, IC1200 or microphone
are defective.
Handsfree Microphone Unit
Is 2.2 V or more applied to R1639?
YES
L1602, R1654, C1644 and JK1600 handsfree
microphone are defective. Or earpiece is in a
poor contact with JK1600 and socket.
3. Power dose not turn on.
Is the voltage of the battery 3.6 V or more?
YES
Is 3.6 V or more on TP1200?
YES
Is 3.6 V or more on TP1211?
YES
Does MCLK (R760) oscillate at 13 MHz?
YES
Is 1.5 V applied to TP1235 when the Power key
is pressed?
YES
Is 1.5 V supplied from TP1003?
YES
Is 32.768kHz supplied from RTCCLK
(TP1006)?
YES
IC1000, IC1100 and IC1200 are defective or
mounted improperly.
CONFIDENTIAL
Is 2.2 V or more applied to C1673?
NO
R1643, R1648, R1649, R1650, R1651, R1658,
C1642, C1646, Q1604 and Q1605 are defec-
tive.
Is 2.2 V or more applied to C1673?
NO
R1638, R1639 and C1637 are defective.
The battery is dead, defective, or deteriorated.
NO
The battery terminal CN1200 is mounted
NO
improperly or in poor contact.
Fuse FS1200 is blown, resistance R1219 is
NO
defective, or power amplifier IC300 is defective.
IC400 and peripheral circuits are defective.
NO
IC1200 and Q1210 are defective or mounted
NO
improperly.
IC1204 is defective or mounted improperly.
NO
IC1000 and X1000 are defective or mounted
NO
improperly.
2 – 26
NO
YES
NO
YES
C1673 or IC1200 is
defective.
C1673 or IC1200 is
defective.