5.4.3VOLTAGES AT VARIOUS PINS OF IC LM324 IS AS FOLLOWS (
IC PIN NO. | VOLTAGES & CHECK CONDITIONS | |
PIN1 | 0V ( WHEN V POT KEPT AT MIN. POSITION IN CV MODE ) | |
PIN1 | +5V ( WHEN V POT KEPT AT MAX. POSITION IN CV MODE ) | |
PIN2 & | +4.9V AT V POT MAX. POSITION. | |
PIN4 | +12V ALL CONDITION | |
PIN7 | 0V AT CC POT MIN. POSITION. | |
PIN7 | 0.5V AT CC POT MAX. POSITION. | |
PIN8 | +1V TO 3.5V IN CV MODE. | |
PIN8 | +10V TO +11V IN CC MODE. | |
PIN9 | 0V. | |
PIN10 | ||
PIN14 | +10 TO 11V IN CV MODE. | |
5.4.4 A. | CHECK VOLTAGES AT D3 | CATHODE +2V (CV) +10V (CC) |
B. | CHECK VOLTAGES AT D4 | CATHODE +10V (CV) + 2V (CC) |
C. | CHECK VOLTAGES AT Z101 | CATHODE |
D. | CHECK VOLTAGES AT Z102 | CATHODE +10V |
5.4.5CHECK ALL REGULATORS OUTPUT WITH RESPECT TO OUTPUT +VE COMMON.
REF. PCB NO. | PART NO. | PIN NO. | VOLTAGES |
U1 | IC7812 | 3 | +12V |
U2 | IC79L05 | 3 | |
U3 | IC7805 | 3 | +5.0V |
CHECK WITH RESPECT TO OUTPUT | |||
U4 | IC7812 | 3 | +12.0V |
All the above readings are approximate values. The given voltages & waveforms are refering to a normal working unit. If find any Voltage or Waveform absent at given points, then trace back to the associated circuits. This complets basic trouble shooting test points.
5.5PARTS ORDERING & REPLACING :
5.5.1OBTAINING REPLACEMENT PARTS : Most electrical parts can be obtained through your local distributor or representative. However you should be able to obtain many of the standard components from a local commercial source in
13
