What value is the pull-up resistor for the hot-end thermistors on the SV04 board?

Sovol SV04 IDEX
1

I’m replacing both SV04 hot‑end thermistors with PT1000 RTDs and would like to keep the stock mainboard intact.

  • Mainboard: SV04 32‑bit “silent” board, rev v5.2.1 (TMC2209)
  • Firmware: Stock Marlin 2.0.x (will edit config as needed)

Could someone please confirm:

  1. The value of the pull‑up resistors for TH0 and TH1.
  2. Whether the two SMD parts marked R93 and R94 are indeed those pull‑ups.
  3. If they are 4.7 kΩ (code “472”), can I leave them in place and just update Marlin to run the PT1000s reliably?

Photos, measurements, or part numbers would save me yanking the board—thanks in advance!

2

Should be 4.7 k unless someone has changed it

If I’m not mistaken if you reroll the firmware with “type 1047” sensor you’re golden

@Bjoern

From configuration.h for the SV04

 Temperature sensors available:
 *
 *  SPI RTD/Thermocouple Boards - IMPORTANT: Read the NOTE below!
 *  -------
 *    -5 : MAX31865 with Pt100/Pt1000, 2, 3, or 4-wire  (only for sensors 0-1)
 *                  NOTE: You must uncomment/set the MAX31865_*_OHMS_n defines below.
 *    -3 : MAX31855 with Thermocouple, -200°C to +700°C (only for sensors 0-1)
 *    -2 : MAX6675  with Thermocouple, 0°C to +700°C    (only for sensors 0-1)
 *
 *  NOTE: Ensure TEMP_n_CS_PIN is set in your pins file for each TEMP_SENSOR_n using an SPI Thermocouple. By default,
 *        Hardware SPI on the default serial bus is used. If you have also set TEMP_n_SCK_PIN and TEMP_n_MISO_PIN,
 *        Software SPI will be used on those ports instead. You can force Hardware SPI on the default bus in the
 *        Configuration_adv.h file. At this time, separate Hardware SPI buses for sensors are not supported.
 *
 *  Analog Themocouple Boards
 *  -------
 *    -4 : AD8495 with Thermocouple
 *    -1 : AD595  with Thermocouple
 *
 *  Analog Thermistors - 4.7kΩ pullup - Normal
 *  -------
 *     1 : 100kΩ  EPCOS - Best choice for EPCOS thermistors
 *   331 : 100kΩ  Same as #1, but 3.3V scaled for MEGA
 *   332 : 100kΩ  Same as #1, but 3.3V scaled for DUE
 *     2 : 200kΩ  ATC Semitec 204GT-2
 *   202 : 200kΩ  Copymaster 3D
 *     3 : ???Ω   Mendel-parts thermistor
 *     4 : 10kΩ   Generic Thermistor !! DO NOT use for a hotend - it gives bad resolution at high temp. !!
 *     5 : 100kΩ  ATC Semitec 104GT-2/104NT-4-R025H42G - Used in ParCan, J-Head, and E3D, SliceEngineering 300°C
 *   501 : 100kΩ  Zonestar - Tronxy X3A
 *   502 : 100kΩ  Zonestar - used by hot bed in Zonestar Průša P802M
 *   512 : 100kΩ  RPW-Ultra hotend
 *     6 : 100kΩ  EPCOS - Not as accurate as table #1 (created using a fluke thermocouple)
 *     7 : 100kΩ  Honeywell 135-104LAG-J01
 *    71 : 100kΩ  Honeywell 135-104LAF-J01
 *     8 : 100kΩ  Vishay 0603 SMD NTCS0603E3104FXT
 *     9 : 100kΩ  GE Sensing AL03006-58.2K-97-G1
 *    10 : 100kΩ  RS PRO 198-961
 *    11 : 100kΩ  Keenovo AC silicone mats, most Wanhao i3 machines - beta 3950, 1%
 *    12 : 100kΩ  Vishay 0603 SMD NTCS0603E3104FXT (#8) - calibrated for Makibox hot bed
 *    13 : 100kΩ  Hisens up to 300°C - for "Simple ONE" & "All In ONE" hotend - beta 3950, 1%
 *    15 : 100kΩ  Calibrated for JGAurora A5 hotend
 *    18 : 200kΩ  ATC Semitec 204GT-2 Dagoma.Fr - MKS_Base_DKU001327
 *    22 : 100kΩ  GTM32 Pro vB - hotend - 4.7kΩ pullup to 3.3V and 220Ω to analog input
 *    23 : 100kΩ  GTM32 Pro vB - bed - 4.7kΩ pullup to 3.3v and 220Ω to analog input
 *    30 : 100kΩ  Kis3d Silicone heating mat 200W/300W with 6mm precision cast plate (EN AW 5083) NTC100K - beta 3950
 *    60 : 100kΩ  Maker's Tool Works Kapton Bed Thermistor - beta 3950
 *    61 : 100kΩ  Formbot/Vivedino 350°C Thermistor - beta 3950
 *    66 : 4.7MΩ  Dyze Design High Temperature Thermistor
 *    67 : 500kΩ  SliceEngineering 450°C Thermistor
 *    70 : 100kΩ  bq Hephestos 2
 *    75 : 100kΩ  Generic Silicon Heat Pad with NTC100K MGB18-104F39050L32
 *  2000 : 100kΩ  Ultimachine Rambo TDK NTCG104LH104KT1 NTC100K motherboard Thermistor
 *
 *  Analog Thermistors - 1kΩ pullup - Atypical, and requires changing out the 4.7kΩ pullup for 1kΩ.
 *  -------                           (but gives greater accuracy and more stable PID)
 *    51 : 100kΩ  EPCOS (1kΩ pullup)
 *    52 : 200kΩ  ATC Semitec 204GT-2 (1kΩ pullup)
 *    55 : 100kΩ  ATC Semitec 104GT-2 - Used in ParCan & J-Head (1kΩ pullup)
 *
 *  Analog Thermistors - 10kΩ pullup - Atypical
 *  -------
 *    99 : 100kΩ  Found on some Wanhao i3 machines with a 10kΩ pull-up resistor
 *
 *  Analog RTDs (Pt100/Pt1000)
 *  -------
 *   110 : Pt100  with 1kΩ pullup (atypical)
 *   147 : Pt100  with 4.7kΩ pullup
 *  1010 : Pt1000 with 1kΩ pullup (atypical)
 *  1047 : Pt1000 with 4.7kΩ pullup (E3D)
 *    20 : Pt100  with circuit in the Ultimainboard V2.x with mainboard ADC reference voltage = INA826 amplifier-board supply voltage.
 *                NOTE: (1) Must use an ADC input with no pullup. (2) Some INA826 amplifiers are unreliable at 3.3V so consider using sensor 147, 110, or 21.
 *    21 : Pt100  with circuit in the Ultimainboard V2.x with 3.3v ADC reference voltage (STM32, LPC176x....) and 5V INA826 amplifier board supply.
 *                NOTE: ADC pins are not 5V tolerant. Not recommended because it's possible to damage the CPU by going over 500°C.
 *   201 : Pt100  with circuit in Overlord, similar to Ultimainboard V2.x