Motorola Gm328 Gm338 Gm398 Detailed 6804112j18 E Manual
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Controlhead GM338 Troubleshooting Flow Chart 3-5 2.3 Display Power Up Alert Tone is OK, volume knob does operate, indicator/backlight is on but nothing on display YES NO YES NO V5 (against 5V) TP0973 between -6V and -7V ? Activity on Address & Data lines A0 / D0..D7 / CS1 of U0971?Check for shortage U0831 / U0971 Check LCD Assembly Check / Replace C0971 / C0973 / R0972 R0973 / R0974 / U0971
3-6 Controlhead GM338 Troubleshooting Flow Chart 2.4 Backlight Power Up Alert Tone is OK, volume knob does operate, indicator/display is on but no backlight NO YES YES NO U0831 Pin 58 is toggling ? Base of Q0934 > 0.7V ?Check / Replace R0847 / C0843 / R0943 Check for shortage U0831 YES NO Collector of Q0934 >5V and < 11V ?Check / ReplaceQ0934 U0931 /R0941 / R0942 / R0944 / R0945 Check / Replace Q0933 / R0947 / R0948
Controlhead GM398 Troubleshooting Flow Chart 3-7 3.0 Controlhead GM398 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
3-8 Controlhead GM398 Troubleshooting Flow Chart 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 NO YESYES A
Controlhead GM398 Troubleshooting Flow Chart 3-9 3.3 Microprocessor (cont.) 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 A
3-10 Controlhead GM398 Troubleshooting Flow Chart 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.
Controlhead GM398 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.
3-12 Controlhead GM398 Troubleshooting Flow Chart 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.
4-1 Section 4 CONTROLHEAD PCBS / SCHEMATICS / PARTS LISTS 1.0 Allocation of Schematics and Circuit Boards .Table 4-1 Controlhead Diagrams and Parts Lists PCB : Controlhead GM328 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 8486146B07 Page 4-6 Table 4-2 Controlhead Diagrams and Parts Lists PCB : Controlhead GM338 8486155B06 Main Board Top Side 8486155B06 Main Board Bottom SidePage 4-7 Page 4-7 SCHEMATICS Sheet 1 of 4 Sheet 2 of 4 Sheet 3 of 4 Sheet 4 of 4 Page 4-8 Page 4-9 Page 4-10 Page 4-11 Parts List 8486155B06 Page 4-12 Table 4-3 Controlhead Diagrams and Parts Lists PCB : Controlhead GM398 8486178B03 Main Board Top Side 8486178B03 Main Board Bottom SidePage 4-13 Page 4-13 SCHEMATICS Sheet 1 of 4 Sheet 2 of 4 Sheet 3 of 4 Sheet 4 of 4 Page 4-14 Page 4-15 Page 4-16 Page 4-17 Parts List 8486178B03 Page 4-18
4-2Allocation of Schematics and Circuit Boards THIS PAGE INTENTIONALLY LEFT BLANK