Sharp 802SH Service Manual page 38

802SH
8.2. Ring tones are heard from the speaker but voice is not.
Is signal sent to R1612?
NO
IC1200 is defective.
8.3. Voice is heard from the speaker but ring tones are not.
Is the volume set to zero?
NO
Is clock sent to R1673?
NO
IC1200 is defective.
9. The display does not appear on Display.
Is the flexible PWB of the display securely
locked to CN3005?
YES
Replace Display.
Does the display appear?
YES
Display unit is defective.
(To page 2-31)
CONFIDENTIAL
IC1600 is defective.
YES
Is sound heard after turning up the volume?
YES
R1673 is defective.
YES
Or IC1600 is defective.
Unlock it, and then reinsert and lock it.
NO
Are the following display parts in good condi-
NO
tion?
IC3008, C3102, C3103, C3104, C3105, C3144,
C3091, C3092, C3093, C3094, C3095, C3096,
C3097, C3098, C3099, C3100, C3101, C3044,
R3018, R3055, R3064, R3046, R3047, R3050,
R3066, R3067, RA3014, RA3015, R3089,
R3091, R3093, R3095
Is 2.9 ± 0.1 V applied to TP3026 and R3064?
Is 1.85 ± 0.1 V applied to TP3027, R3046 and
R3047?
Is the waveform from R3018 a 6.5 MHz pulse
NO
wave?
A
Is the waveform from RA3010, RA3011,
RA3012, RA3013, R3017, and R3024 a pulse
wave?
Is the voltage on C3102 between -5.2 V and
-4.9 V?
Is the voltage on C3103 between 9.5 V and
10.4 V?
Is the waveform sent from RA3014, RA3015,
R3089, R3091, R3093 and R3095?
CN3005 socket parts are defective, or the dis-
play PWB pattern is broken
2 – 30
YES
NO
NO
YES
NO
YES
YES
NO
YES
NO
YES
NO
YES
OK.
The display parts are
not mounted properly.
The battery is defec-
tive or not set; the
PWB is defective; the
battery needs to be
charged; the thin
coaxial cable socket is
mounted improperly or
broken; the main PWB
is defective; R3019 is
mounted improperly;
or the display PWB is
defective.
RA3010, RA3011,
RA3012, RA3013,
R3017 and R3024 are
defective or mounted
improperly.
IC3008, C3102 and
C3103 are defective
or mounted improp-
erly.
IC3008, RA3014,
RA3015, R3089,
R3091, R3093 and
R3095 are defective
or mounted improp-
erly.