Garland SH/BA 3500, Service Manual

Page: 11 / 28

Service-Manual, new version author: Chr. Fuchs 17.06.99 / INDUCS Ltd. 18.09.03 page 11 of 28
5.6.2. Rectifier
The recitifier is separated from the power board but still fixed on the heat sink. Dismount according
to „Replacement of power board“.
•
Conducting-state voltage Diode U
+
= approx. 0.5 V: if all conducting-state voltages show
approx. 0.5 V, the rectifier works.
•
Short circuit at the different diodes: rectifier is defective.
Picture 1
3.1
5.6.3 Transistor module
The transistor module is separated from the power board but still fixed on the heat sink. Dismount
according to „Replacement of power board“.
Conducting-state voltage Diode U
+
= approx. 0.4 V: if all conducting-state voltages show approx.
0.4V, the transistor module is working.
A short circuit between AC2-E2, C1-E1 and C1-E2 means that the transistor module is defective. If
the module is defective, verify diodes D7, D8, D9 and D10 on short circuit (see 9.2/9.3). Replace
the power board when you discover a short circuit.
Picture 2