Alpine PDX-1.1000 - About Semi-Fixed VR (VR401) of MAIN P.w.board

PDX-1.1000
About Semi-fixed VR
(
VR401
)
of MAIN P.W.Board
1. Semi-fixed VR (VR401) of PDX-1.1000
This VR requires no adjustment at repair. However, follow the procedure below.
1) Check and record the resistance before repair.
2) Measure the resistance again after repairer.
* This is for confirmation when VR is operated erroneously.
If it is operated erroneously, recover the previous resistance.
*Because of Sub PWB's GAIN there are different value of VR401 resistance depend on each product.
2. Checking operation with single PWB
When checking the operation and voltage of single PWB, use a jig (aluminum plate or the like) for
heat radiation of components such as “Direct-FET“ that generates high heat.