repair.md

Terratec PHASE X24 Repair

Serial Header Pinout:

115200baud 3.3V 8n1

when chip is facing up, so that the bridgeco label is readable

| GND | RX | TX | VCC |

(from the ic's prespective)

Check for faulty capacitors:

1. When the ac-power transformer is connecter to the unit, do the two blue led's labeled MAIN and MONITOR light up after about 5sec? (No -> Dead Capacitor or Powersupply issue) Even when using the interface standalone, both LEDs (MASTER/MONITOR) off is not a valid mode of operation after 4sec.

2. Does pressing the Master Knob switch between the modes (both LED's, upper LED, lower LED)? (If this stops working after some time / is working randomly -> Dead Caoacutor somewhere)

3. connect serial to usb converter to the header FTDI's rx to header tx, and GND->GND. Leave tx from pc side unconnected to avoid unnecessary risk.

4. Check for boot output, if there are random errors which change after each start like (heap corruption, bad checksum etc...) ->Dead capacitor, probably C35

5. Use an Oscilloscope and probe the voltages at all the capacitors (or at least in the power supply section and near the ad chip and the main cpu). You can connect the GND of the Oscilloscope to the firewire-connector's outer metall casing.

5.1 Check if you get the following voltages

• about 14V at the input capacitor (can be jittery and the device will still work if all other voltages are fine)
• -12V (should be spot on and without much jitter +-0.2V)
• 12V (should be spot on and without much jitter +-0.2V)
• 5.4V (only minimal jitter +-0.1V is allowed here)
• 3.3V (only minimal jitter +-0.1V is allowed here)
• 1.8V (only minimal jitter +-0.1V is allowed here) -> if jittery check C35
• 48V for phantom power at the capacitors near the switches for phanom power

List of capacitors:

Power supply section:

• 2x 2200uF 6.3V
• 1x 1000uF 25V
• 1x 330uF 25V
• 1x 330uF 6.3V
• 1x 100uF 50V
• 4x 22uF 50V

XLR Preamp section:

• 2x 47uF 16V
• 4x 100uF 63V

Phantom Power section:

• 2x 1000uF 63V
• 4x 1000uF 25V
• 1x 22uF 50V
• 4x 22uF 16V
• 2x 10uF 25V

Digital Section:

• 1x 330uF 6.3V
• 2x 22uF 25V

audio rear and AD/DA section:

• 1x 100uF 16V
• 28x 22uF 16V
• 4x 10uF 25V
• 8x 10uF 16V
• 1x 4.7uF 35V SMD

Using the interface with win10 and z170 (i7 6700)

1. get a firewire 800 card with an XIO2213B (not A)
2. disable driver signature enforcement, with the method where you restart your pc with adcanved options->Start settings and select 7
3. install PHASE_X24_FireWire_Setup_GSIF_2.27.exe

z_Caps_Path.svg