Primary Power Supply (Ha-3 & Ra-5A Chassis); Oscillator Start Up; Driver / Output Stage - Sony KD-34XBR2 Training Manual

Primary Power Supply (HA-3 & RA-5A Chassis)
The Primary and Secondary power supplies are similar in operation. They differ in schematic nomenclature
(component numbers) and output voltages. The HA-3 simplified secondary power supply is shown in Figure 6-1
for this description.
The primary power supply on the HA-3 chassis A board consists of three parts:
1. Oscillator 2. Output stage 3. Regulator Stage
The oscillator starts up to produce an initial signal for the output stage. The output stage develops voltage to
continue running the oscillator stage, supply the regulating stage, and provide normal output for the TV. One of
the normal TV outputs is used to start the secondary power supply.
R6002
AC RECT.+
0.47 OHMS
FROM
IC6501/1
(D BD.)
R6001
R6003
R6004
3V
R6006
C6007

Oscillator Start Up

The oscillator within IC6001 starts if the V Sense input voltage at pin 1 is above 1.3Vdc, but less than 8Vdc.
Sample voltage from pin 18 is then used to run the internal oscillator. The initial frequency is approximately
200kHz. The low amplitude initial oscillator signal is output IC6001/pins 12 and 16 into the driver/output stage.

Driver / Output stage

The oscillator voltage output at pins 12 and 16 use drivers Q6001 and Q6002 to develop T6002 secondary
voltages. IC6001' s oscillator will shut down if the driver transistor' s current is excessive. To prevent premature
shutdown, the timer capacitor C6007 delays the shutdown.
A BD.
340VDC
R6010
18
V
D
V
G(H)
V
SENSE V
IC6001
1
DRIVER
MCZ3001D
V
G(L)
OCP
TIMER
VB F/B
VC1 VC2
6 8 10 14 2
-28V
+
10V
1
D6004
+
C6009
18V
FIGURE 6-1 - PRIMARY POWER SUPPLY - HA-3 CHASSIS
6. Primary Power Supply - HA-3 & RA-5a Chassis
Q6002
-32V
N
16
CH
-32V
15
S
Q6001
4.5V
N
12
CH
R6009
OV
9
R6018
1.86V
PH6001
OPTICAL
2
ISOLATOR
16
T6002
R6023
R6020
C6014
R6019
R6041
IC6003
ERROR DET.
3 1
uPC1093C
D6018
UNREG.
7V SOURCE
D6014
UNREG. 11V
SOURCE
PRI
PRE 15V (D
BD.)
D6012
D6011
D6016
Q +6.5V
SOURCE
R6045
R6040
23TVP12 1341 8/30/01