5.Measure the resistor coloured GREEN. The measured value should measure within + or – 5% value listed in the table below. Replace any resistor that measured beyond the + or – 5% value listed in the table below.
Resistor | Printed |
| Correct |
|
Number | Value | Measured Value | ||
|
|
| +5% | |
R10 | 4K7 | 2K25 | 2K3 | 2K35 |
6. Measure across the pair of test points listed in the table below. | If the | ||||
measured value is not within + or – 10% of the value listed in the table then | |||||
replace the resistors shown in the table below. |
|
| |||
Test | Layout | Correct |
| Replace |
|
Points | Reference | Measured Value | Resistors |
| |
A to A | TP2 to J19 | +10% | R11, R12, R14 |
| |
|
| 15ohm 17 ohm 19 ohm |
|
| |
7.Measure the resistors coloured ORANGE. Since the value of these resistors is 0.1 ohm, your ohmmeter will measure the higher series resistance of the test leads if the resistor is OK. If the resistor is damaged your ohmmeter will read a very high resistance (an open circuit). Replace any damaged resistors.
8.Measure the output TO
9.Replace any output transistors that you have marked as being damaged. Replace any diodes that you have found to be damaged. Replace all of the red transistors that were removed.
10.Inspect the traces on the circuit board for any that have ‘fused’ open or look like they got very hot. Bridge and solder a piece of wire over any damaged traces.
AFTER YOU HAVE REPLACED ALL OF THE NECESSARY COMPONENTS INSPECT THE REPAIRED BOARD FOR ANY MISSING PARTS, CORRECT VALUES IN THE CORRECT POSITION AND THAT ALL COMPONENTS ARE SOLDERED.