45
105S2 CM23 GSIII
Repair flow chart
E. CPU
check list
check cpu
B+ pin6=5V
OSC.=12MHz
pin21(stby) pin28 (off)
normal
hi
hi
standby
low
hi
off
low
low
check pin22
check up , down , left , right, enter
Basic Check
1. Abl-con
19 , 20
S-cap switch
22. Key
check
Q2,Q3
check pin 3
pwm from 0V to 5V
21 , 28
stby , off
check
pin 21 / 28
7804 / 7805
5. Reset
check pin5
from low to hi
check
3816 / 2820
check pin13
normal : low
H-unlock : hi
13. H-unlock
check
3850 / 7809
24. Selftest
check pin24
1.no H/V sync & IF cable pin5 floating
- free run mode
2.H/V sync exist & IF cable pin5 to ground - normal
3.H/V sync non-exist & IF cable pin5 to gnd - power saving
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