Secondary Power Supply (Ha-3 & Ra-5A Chassis); Start Up - Sony KD-34XBR2 Training Manual

Secondary Power Supply (HA-3 & RA-5A Chassis)
The Primary and Secondary power supplies are similar in operation and circuitry using the same IC and driver/
output stage. They differ in schematic nomenclature and output voltages. The HA-3 simplified secondary power
supply shown in diagram 24 contains the RA-5A chassis nomenclature in parentheses.
340V FROM
BRIDGE RECT.
R6526(R6041)
D6530
(D6001)
Q6531
(Q6104)
MAIN RELAY
CN6504/2
(CN6101/6)
5V
1
STBY
SURGE RELAY
CIRCUIT D6532
PH6501 (D6002,
PH6001)
PRI PRE 15V
CN6501/5
(D6049/C)

Start UP

Although IC6501 is identical to IC6001 found in the Primary power supply, IC6501/pin 18 in this supply is not
connected to 340Vdc. This means the VC1 voltage at pin 8 must be input externally to this stage to start IC6501' s
oscillator (during or after V sense at pin 1 senses voltage). Refer to Figure 7-1 as you follow the following
Secondary Power Supply start up sequence:
1. 340Vdc (B+) is applied to this stage from bridge rectifier D6530.
2. Pri Pre 15V voltage from the Primary power supply is applied to IC6501/pin 8. It must be at least 15.6Vdc to
enable IC6501' s internal oscillator.
3. Main Relay signal from Main Micro IC001/pin 72 (HIGH at CN6501/pin 5) turns ON Q6531, PH6503 and
Q6528. Q6528 turns OFF Q6503, enabling voltage to appear at IC6504/pin 2.
4. Voltage divider R6646, R6513, and R6517 deliver at least 1.3Vdc to IC6501/pin 1.
5. IC6501 turns ON using voltage from pin 8 to run the oscillator.
6. An internal diode connected between pin 8 and 10 supplies voltage to VC2.
7. Oscillator signal outputs IC6501/pins 12 and 16.
Testing for NO Start
If the secondary power supply does not start, use Chart 7-1 to determine if an input to the D or G board is missing:
Refer to Figure 7-2 for the checkpoint locations on the boards.
PRI PRE 15V
(STBY 15V)
R6557
N
(R6074)
(Q6003)
Q6528
2
(Q6001)
3
N
PH6503,
ON
(PH6003)
ISOLATE
4
Q6526, Q6529,
(Q6004-5)
LATCH
18V
FIGURE 7-1 - SECONDARY P.S. HA-3 (RA-5A) CHASSIS
7. Secondary Power Supply HA-3 & RA-5A Chassis
PRIMARY P.S.
R6646
R6513
(R6015)
(R6013)
Q6503
1
OFF
N
R6517
(R6017)
IC6501,
(IC6001)
RA-5A ONLY
DRIVER
MCX
STBY
33001D
R6018
5V
R6533
HA-3 ONLY
8
VC1
20
OUTPUT
MOSFET
N/C
Q6506-7
18
(Q6006-7)
16
T6501
(T6001)
12 PIT
1
IC503
(IC6101)
CONTROL
4
PH6502
1.8V
(PH6002)
2
ISOLATE
HA-3 RA5A
+ +
15V 15V
- -
+24V +22V
+200V
+135V +135V
24TVP12 1371 8/30/01