Sony KD-34XBR2 Training Manual page 83

Step
1. Press Power On
button
2. AC Relay activates
3. Primary PS powered
4. Surge Relay
activates
5. Secondary PS is
enabled 1.
6. Secondary PS is
enabled 2
7. Secondary PS
powered
8. VTIM (vertical
timing) pulses input
Main Micro IC001
9. Picture appears
Chart 18-4 - Power On Sequence
Main Micro receives the command
Main Micro (B bd) activates AC relay RY6001 (G bd)
B+ applied to primary PS to start & run
Primary PS output Sub 6.5 energizes surge relay
RY6002
VC1 voltage (15V) from Primary PS D6049/C enables
the secondary PS.
Main Micro IC001 turns on Secondary PS.
Secondary PS starts and runs powering TV
Video Processor (Jungle) IC3006 on A board gets
9Vdc operating voltage from Primary PS and outputs
VTIM pulses to IC001 and IK test drive to CRT (in V
blanking area of the CRT above the screen)
Main Micro IC001 instructs Video Process IC3006 to
output vertical drive and unblanks picture if IK signal
is OK.
G board
RY6002
AC input
18. RA-5A Chassis - Power Supply Block
Action
FIGURE 18-3
80
Verification
G board CN6101/pin 4 =
5Vdc
G board CN6106/pin 8 or 9
= 6.5Vdc
G board - Feel for click in
rear relay RY6002. RY6001
is nearest the line cord.
G board - D6049/Cathode =
15.6V minimum
G board CN6101/pin 9 =
5Vdc
G board CN6106/pin 9 =
135Vdc
A board CN3014/pin 1 =
11V (regulated to 9Vdc on
the A board)
A board Serial data port
CN3009/pins 10 (data), &
pin 11 (clk).
D6049