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Motorola Gm Series Detailed 6864115b62 A Manual

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Page 321

Controlhead GM380/1280 Troubleshooting Flow Chart 3-7
3.0 Controlhead GM380/1280 Troubleshooting Flow Chart
3.1 On/Off 
R0854
Pin TAB1
when pressed
=5V ?
J0801 PIN2
> 10V ?
J0801 PIN2
 =5V?
Check / Replace
Q0853 / R0853
YES
NO
YES
NO
YES
NOCheck / Replace
D0852 / R0852
Check / Replace
Volume Pot R0854
Check / Replace
Q0851
Radio can not be switched on via ON/OFF Volume Knob
YES
R0854
Pin TAB
= 5V?NOCheck / Replace
R0855 / VR0855 / D0855
C0856
Press and hold
On / Off
Volume Knob

Page 322

3-8TROUBLESHOOTING CHARTS
3.2 Microprocessor 
Power Up Alert Tone is audible on external speaker but volume
knob does not operate and no indicators are on
TP0876
=5V ?
NO YES
U0871
Pin 73 EXTAL
= 8 MHzTP0866
= 0V NO
Check / Replace
R0873 / U0873 /
U0871Check / Replace
R0866 / C0866 / 
Q0866 / R0863
Check / Replace
R0861 / R0862 / D0861
C0861 / C0862 / U0861
C0863 / C0864 / C0865 1
NO
YESYES

Page 323

Controlhead GM380/1280 Troubleshooting Flow Chart 3-9
3.3 Microprocessor 
1
Data Signal
on J0801
Pin 5 BUS+
?
Data Signal
on TP0877
SCI_RX
?
Data Signal
on TP0878
SCI_TX
 ?
Check / Replace
D0872 / R0887
YES
YES
YES
NO
NO
NOCheck / Replace
U0871
Check 
Radio Controller
Check / Replace
R0888 / R0889
Measure with scope
while rotating
Volume Pot

Page 324

3-10TROUBLESHOOTING CHARTS
3.4 Display 
TP0973
Voltage Sense
between
 2V and 2.4V
?
Activity on
Address & Data lines
A0 / D0...D7 / CS1
of U0971
?
NO
YES
YES
NO
Check / Replace
Flex connection
Resistors on Address & Data
lines and LCD Module
Check / Replace 
LCD Module
Check for shortage
U0871
Power Up Alert Tone is audible, volume knob does operate,
indicator/backlight is on but nothing is seen on the display.

Page 325

Controlhead GM380/1280 Troubleshooting Flow Chart 3-11
3.5 Keypad Backlight 
U0871 Pin 25
is toggling ?
Base of Q0943
> 0.7V ?
Collector of
Q0943
>5V & < 11V
 ?
Check / Replace
Q0941 / R0955 / R0957
YES
YES
YES
NO
NO
NO
Check / Replace
Q0943 / U0941 / R0941
R0943 / R0949 / R0951
Check for shortage 
U0871
Check / Replace
R0945 / C0943 / R0947
Power Up Alert Tone is audible, volume knob does operate,
display is on but no keypad backlight.

Page 326

3-12TROUBLESHOOTING CHARTS
3.6 Display Backlight 
U0871 Pin 24
is toggling ?
Base of Q0963
> 0.7V ?
Collector of
Q0963
>5V & < 11V
 ?
Check / Replace
Q0961 / R0975 / R0977
YES
YES
YES
NO
NO
NO
Check / Replace
Q0963 / U0941 / R0961
R0963 / R0969 / R0971
Check for shortage 
U0871
Check / Replace
R0965 / C0963 / R0967
Power Up Alert Tone is audible, volume knob does operate,
display is on but no display backlight.

Page 327

Chapter 4
CONTROLHEAD PCB / SCHEMATICS / PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards
.Table 4-1   Controlhead Diagrams and Parts Lists
PCB :
Controlhead GM140/340/640
8486146B07 Main Board Top Side
8486146B07 Main Board Bottom SidePage 4-3
Page 4-3
SCHEMATICS
Sheet 1 of 2
Sheet 2 of 2
Page 4-4
Page 4-5
Parts List
8486146B07Page 4-6
Table 4-2   Controlhead Diagrams and Parts Lists
PCB :
Controlhead GM160/360/660
8486155B06 Main Board Top Side
8486155B06 Main Board Bottom SidePage 4-7
Page...

Page 328

4-2controlhead PCB / Schematics / Parts lists

Page 329

Controlhead GM140/340/640 - PCB 8486146B07 / Schematics4-32.0 Controlhead GM140/340/640 - PCB 8486146B07 / Schematics
D0871 D0872
D0873
D0874
D0875D0876 D0877D0878D0879
D0881 D0884
D0885 D0886
D0887
D0888 2 3 5 7 9
864 10
J0811
JU0852 JU0853
JU0854 4
1
235
R0823
S0861
S0862
S0863 S0864S0865
S0866
ZWG0130114-A
C0802
C0803
C0804
C0805
C0806
C0808
C0809
C0810C0811
C0813
C0815
C0816
C0817
C0818C0819
C0821
C0822 C0823C0824
C0831 C0832 C0833
C0843
D0821
D0822
D0831 12
J0801
1
2
P0801
Q0821
Q0822
Q0823
Q0841...

Page 330

4-4Controlhead GM140/340/640 - PCB 8486146B07 / Schematics
HOOK
GROUND
MIC 10 GM300CONTROL HEAD
PTT_IRDECODER 7CONNECTOR
8J0801
9
MICROPHONE
CONNECTOR
SCI_RX BOOT_VPP J0811
RESETBOOT_MODE WARIS
HANDSET_AUDIO 1
CONTROLLER
KEYPAD ID CONTROL HEAD ID
SCI_TX EXT_KP_ROW EXT_KP_COL
FLT_A+
4 5 6
BUS+ 2 3
5V
VR0822
5.6VR0843
2.2K
NU
GND
INPUT RESET_
7
U0835
MC33464N-45ATRJ0801-8
JU0853
SWITCH C0833R0833
0.1uF
2 47K10K R0844
55
VDD
22
VRH
21
VRL 23
VSS1
VSS2 24
49
VSS3
45
XIRQ 33
XTAL
PE3_AN3 19
PE4_AN4 14
16...

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