JVC RX-D Series Training Book page 60

• Before plug CN111, check IC101 with a multimeter
to ensure that there is no shorting between pins
(except pin 5 & 6); otherwise it may damage the
'DCDC +12V' and '-B+12v' power supply.
•Make sure the voltages 'DCDC +12v', -B and
'–B_+12v' appear at pin 2, 1 and 7; and verify the
input 4.5V p-p PWM signal at pin 5 and 6. If R1115
was opened the PWM signal becomes 13v p-p.
•If there is no out put from HO and LO (pin 3 and 8),
then IC101 is bad.
•If the output PWM level is less than 10V or bed
waveform, IC101 or peripheral components maybe
defective.
•It is possible to measure IC101 from the component
side of the main PCB; (see the next page).