Service manual

1-30 June 21, 2004
GENERAL NP88 FLEX
Troubleshooting
distortion), and timing of pulses. The input and output oscilloscope check easily
isolates a defective IC.
Circuit voltages are given in various key places on the schematic diagram s as an
aidto theisolation process.Giveparticularattentionto thedcvoltagesat theinput
and output pins of the circuit and its decoupling circuits. A low voltage, or a higher
than normal voltage at the input or output should be investigated further before
replacing the circuit. A generalized troubleshooting flowchart is provided in
Figure 1-29.