Star Tech Journal

S*T J APRIL 1981 9
FIGURE 2
MEASURING POINTS
*
POINT
ELECTRO HOME
SANYO
MATSUSHITA
G)
MEASURE B+ ON:
R-01 - LARGE WHITE
220
RESISTOR ON
UPPER PORTION OF
HEATSINK ON LEFT SIDE
OF PCB. WHITE WIRE IS
B+.
R-609-180..0.. - BIGGEST
WHITE RESISTOR ON PCB.
B+ IS TERMINAL
CLOSEST TO YOU.
R803 - LARGE WHITE
150 ..o_ RESISTOR ON
TOP SIDE OF HEATSINK
ON THE RIGHT SIDE OF
PCB. WHITE WIRE IS B+.
UNSOLDER COLLECTOR
LEAD OF X701
CR451 - UNSOLDER ONE
LEAD
CR511 - UNSOLDER ONE
LEAD
n
@
ON THIS MEASUREMENT, WE ARE LOOKING FOR A SQUARE WAVE, 0.8V OR GREATER
AND OCCURRING EVERY 63 uSEC -
IC501-PIN 10
@
IC401 - PIN 10
IC401 - PIN 6
ON THIS MEASUREMENT, WE ARE LOOKING FOR A SQUARE WAVE, 50 TO 200V PP,
AND OCCURRING EVERY 63 uSEC. IF READING THIS VOLTAGE WITH A METER, THE
VOLTAGE MAY BE LOWER OR HIGHER BUT NEVER THE SAME AS B+. IF IT IS THE
SAME AS B+, THE DRIVER STAGE IS NOT FUNCTIONING.
X501 - COLLECTOR
TR451 - COLLECTOR
0502 - COLLECTOR
FIGURE 3
CIRCUIT COMPONENTS
ELECTROHOME
SANYO
MATSUSHITA
REGULATOR
D-905 X902
X901 X04
TR981 IC601
Q801 Q802
CR101 CR102
HVL
COMPONENTS
X701
CR451
CR511 R539
HORIZONTAL
OSCILLATOR
IC501
IC401
IC401
HORIZONTAL
DRIVER
X501
T-501
TR451 T-451
0502
T501
HORIZONTAL
OUTPUT
X01
T-502
TR904 T-452
Q551
T-502
0
D-701