Monitor Check Flow Chart - Hitachi CM715ET Service Manual

B. Monitor Check Flow Chart
B-1. No Raster
No raster
Check power
indecator lighted
Check
contrast & brightness
control adjust to MAX.
Check
HEATER voltage= 6.3 VDC
G1= -50-70 VDC
G2= 350-700VDC
Check CRT
No
Yes
Yes
No
Yes
FBT pin1
Yes
about 700Vpp
Check Q801
Yes
Check AC
power input
Check Q504
collector voltage
about 900 Vpp
Yes
Check U801 pin6
Yes
seqarewave from
No
U801 pin7 Vcc
Check power
supply circuit
29
Check
power supply
circuit
Check U401
No
Check U401
No
pin7 output
sequare wave from
Yes
Check Q417, Q416
Yes
No
CheckQ505 "S" pin
voltage 180VDC
Yes
Check T802 D506