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--- projects:repair:philips_pe1542_power_supply [2019/10/28 00:20] – admin
+++ projects:repair:philips_pe1542_power_supply [2024/09/21 23:33] (current) – admin
@@ Line 1: / Line 1: @@
-====== Philips PE1542 Power Supply ======
+====== Philips PE1542 Power Supply repair ======
 The Philips PE 1542 is a power supply which consists of three adjustable outputs, linear regulating, non-switching type. For sensitive measurements where signal spectrum measurements are required, switching type power supplies are less suitable, because they generate small amounts of (harmonic) signal noise themselves. Linear regulators are therefore most suitable for such applications. The power supply is based around three modules with each having a traditional ua723c regulator IC. The specifications of the power supply are:
   * 2x 0-20v, 0-1A
@@ Line 20: / Line 20: @@
 All 6 potentiometers to set voltage/current and the 3 voltage/current switches on the front suffer from ageing. After searching, the following replacement parts were ordered:
   * 3x Switch DPDT, ON-ON, C&K Components (Farnell: 143-7699 / Manufacturer Art. Nr. 1201M2S3CQE2)
-  * 6X POTENTIOMETER, LINEAR, 2K2, 3W, 10% PE30L0FR222KAB By VISHAY
+  * 6X POTENTIOMETER, LINEAR, 2K2, 3W, 10% PE30L0FR222KAB By VISHAY (Farnell: 1141632)
 Unfortunately, none of these parts are a direct replacement. Therefore some mechanical work is required to make these parts fit:
   * Mount the 6 potentiometers on an aluminium L-profile, Mount the whole assembly on the front panel with two spacers.
-  * Mount each switches behind the existing switch, by removing the original contacts. The cutting a square hole at the back of the original plastic handle. By shortening the handle of the new switch, at will fit into the old handle. Use a small test circuit board and some threaded rod and screws to mount the switch to the original metal casing.
+  * Mount each switch behind an existing switch, by removing the original contacts. Then cut a square hole at the back of the original plastic handle. By shortening the handle of the new switch, at will fit into the back of the old handle. Use a small test circuit board or similar and some threaded rod (Which I soldered to the metal casing of the original switch) and screws to mount the new switch.
-  * On the main PCB, increase the 6 holes for the potentiometers to 12mm. The new potentiometers are too short and must be soldered using additional wires, as can be seen on the last picture below.
+  * On the main PCB, increase the 6 holes for the potentiometers to a diameter of 12mm. The new potentiometers are too short and must be soldered using additional wires, as can be seen on the last picture below.
+Below some pictures of the Philips PE 1542:
 |  {{ :projects:repair:img_20191020_225624.jpg?direct&300 |}}  |  {{ :projects:repair:img_20191020_225647.jpg?direct&300 |}}  |  {{ :projects:repair:img_20191020_225634.jpg?direct&300 |}}  |
-^  Philips PE 1542 back - I  ^  Philips PE 1542 back - II  ^  Dupont connectors for connecting\\ switches to main board  ^
+^  back - I  ^  back - II  ^  Dupont connectors for connecting\\ switches to main board  ^
 |  {{ :projects:repair:img_20191020_225704.jpg?direct&300 |}}  |  {{ :projects:repair:img_20191020_232924.jpg?direct&300 |}}  |  {{ :projects:repair:img_20191021_001253.jpg?direct&300 |}}  |
-^  Philips PE 1542 front  ^  Philips PE 1542 PCB - I  ^  Philips PE 1542 PCB - II  ^
+^  front  ^  PCB - I  ^  PCB - II  ^

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