Strymon Ojai/Zuma

[guiddruid]

This topic on MXR ISO brick includes some mentions of Ojai & includes a gut shot: viewtopic.php?t=30926

Schematic or IC datasheet for Ojai???

More gut shots of the Ojai here: https://alfalfasprout69.wixsite.com/oja ... t-pictures

24V connector is EIAJ-05 (https://www.strymon.net/faq/link-ojai-units-zuma/)
24V input/loop board appears to just hold a Nichicon filter cap & (common mode, given 2 colours of wire?) inductor.

16 pin chip marked "AJE BAC" is probably a buck converter. Possibly controller only? Figuring out what this is should lead to a datasheet explaining 90% of the rest of it.
3 pin SOT connected to the 16 pin chip probably a power transistor. Single-ended drive?

Transformer marked Chipsen EP10 (28uH) TAIHU130-tm

large body 4 pin on back side of the board probably an opto isolator
not sure what the 5 pin SOT package next to it could be. Looks like it is on the output side of the transformer.

[guiddruid]

Took some photos from my Zuma. Can't seem to upload them here, so link to them instead:



T3CJ, DCDC, https://datasheetspdf.com/datasheet/XC9225.html
- From ident: XC9225, 3.2 volts out, 1.2MHz osc
- feedback loop of this DCDC looks to be controlled by the 9/12/18v switch
- looks to be using very small smd inductor. Not the big chipsen part

EL3H7, Opto, https://www.mouser.com/datasheet/2/143/ ... -26376.pdf
- collector goes to pin13 of AJE BA1. Emitter looks like it goes to gnd on inner layer

AJE BA1, 16pin quad pack
- package is 3x3mm. Looks to be driving the big chipsen transformer?

KARL8, 3 pin SOT23
- connects to pin 11 of AJE BA1
- connects to chipsen transformer
- marked as Q, so probably a transistor of some kind

CHIPSEN EP10 (28uH) TAIHU 130-TM
1000uF 10V nichicon output caps (voltage rating a bit low) on 9v outputs. 1000uF 25V on 18v outputs
129 ZHW, 12v zener, https://pdf2.alldatasheet.net/datasheet ... M2Z12.html

[cdivad49]

Hi guys! I have a ZUMA but there was an electric incident. Amazingly only a resistor was carbonized by the electric shock, and I need replace only that resistor but there is no way to obtain the correct value.
Could you help me to obtain the value? I