Epson ELPDC21: Difference between revisions

Epson ELPDC21
Manufacturer	Epson
Code name	H757MA_R2 2176136
Release date
Device type	Camera

VisualWikitext

Latest revision as of 01:43, 27 January 2024

At the moment this page only describes the mainboard called H757MA_R2 2176136. It is not known if other revisions exist or not.

Guides

Explanatory Guides

	Type	Difficulty
Epson ELPDC21 Debugging UART	Troubleshooting/Diagnostics	3. Hard

Repair Guides

Create a Guide

Device pictures

The device - seen from above.

PCB pictures

Main board - top side
Main board - bottom side
PCB in camera head

Reference measurements (also schematics if available)

Voltages measured on a working unit
Measured voltages - Zoomed in on two smaller regulators
Uart Signals
SPI communication pins between main CPU and Thine ISP chip
The power button signal
Main CPU (SoC) reset signal
Under the THP7321
Bottom of the THP7312
I2C SCL and SDA lines

More Information/External Sources

Voltages measured on working product (after turning on)


Component RefDes	Voltage	Type
C2008/C2011/L2000	5.15V	Switching
C1911/C1912/L1903	3.3V	Switching
C2012/L2001	1.2V	Switching
C1905/L1901	1.35V	Switching
C1910/C1922/L1902	1.42V	Switching
C1904/L1900	3.0V	Switching
C2003/IC2000	3.3V	Linear
C2009/IC2003	1.8V	Linear
C1804/IC1800	3.33V	Linear, Always On

Partial BOM


Component RefDes	Marking	Name	Comment
IC2002, IC1903, IC2004, IC1901, IC1902, IC1900	QTZ	TPS62140RGTR/TPS62140RGTT	Step-down converter
IC2000	NR1	TLV70033DSER/TLV70033DSET	3.3V linear regulator
IC2003	NK1	TLV70018DSER/TLV70018DSET	1.8V linear regulator
IC1800	LPBG	LP2981-33	3.3V linear regulator
IC1600, IC1603	G8Y	S-80928CNNB-G8YT2x	2.8V Voltage detector with delay (IC1600 resets the main CPU, IC1603 resets the smaller microcontroller IC1000)
IC1000	C17W04F10J	Epson S1C17W04	16-bit Microcontroller, Always On
IC900		Hynix H27U4G8_6F2D / H27S4G8_6F2D	Nand Flash
IC1300	THP7312	THine THP7312	ISP chip
IC1	MCIMX6D5EYM10AD	IMX6DQCEC	Main CPU: i.MX 6Dual/6Quad Applications Processors for Consumer Products
C205		220nF	Author replaced mechanically damaged component, not sure about correctness of this measurement, but product worked with replacement.
C272		100nF	Author replaced mechanically damaged component, not sure about correctness of this measurement, but product worked with replacement.
R209		9.1 ohm	Author replaced mechanically damaged component, not sure about correctness of this measurement, but product worked with replacement.
R353		0 ohm link	Author replaced mechanically damaged component, not sure about correctness of this measurement, but product worked with replacement.

Useful Signals


Component	Pin #	Name	Comment
CN1600	7	UART_TX	(TX from the board's perspective, runs at 460800 bps)
CN1600	9	UART_RX
CN1300	10	I2C_SCL	I2C line is shared by devices on the motherboard, but also goes to the camera head
CN1300	11	I2C_SDA
IC1600	4	Reset of the main CPU	Short this to ground to cause a main CPU reboot. (this is an open drain output of the voltage detector, so it's okay to short to ground)
CN2001/CN1000*	2	Power Button	Short this to ground to prompt the board to boot even when the flex cable to the interface board is not connected

* not clear from the silk screen, please see images above

@@ Line 4: / Line 4: @@
 |Device type=Camera
 }}
-{{stub}}
 At the moment this page only describes the mainboard called H757MA_R2 2176136. It is not known if other revisions exist or not.
@@ Line 13: / Line 12: @@
 ==Device pictures==
 <gallery showthumbnails="1">
-File:Epson ELPDC21 document camera.jpg
+File:Epson ELPDC21 document camera.jpg|The device - seen from above.
 </gallery>
@@ Line 20: / Line 19: @@
 File:Epson elpdc21 document camera mainboard top.jpg|Main board - top side
 File:Epson elpdc21 document camera mainboard bottom.jpg|Main board - bottom side
+File:Epson elpdc21 document camera pcb camera head.jpg|PCB in camera head
 </gallery>
 ==Reference measurements (also schematics if available)==
 <gallery showthumbnails="1">
-File:Example measurement pictures.jpg
+File:Epson elpdc21 document camera power rails measured.jpg|Voltages measured on a working unit
+File:Epson elpdc21 document camera power rails measured zoomed in on two regulators.jpg|Measured voltages - Zoomed in on two smaller regulators
+File:Epson elpdc21 document camera uart signals.jpg|Uart Signals
+File:Epson elpdc21 document camera spi pins found.jpg|SPI communication pins between main CPU and Thine ISP chip
+File:Epson elpdc21 document camera power button signal.jpg|The power button signal
+File:Epson elpdc21 document camera main cpu reset signal.jpg|Main CPU (SoC) reset signal
+File:Epson elpdc21 document camera what the traces look like under the thine chip.jpg|Under the THP7321
+File:THP7312 bottom substrate.JPG|Bottom of the THP7312
+File:Epson elpdc21 document camera I2c scl sda.jpg|I2C SCL and SDA lines
 </gallery>
+==More Information/External Sources==
 === Voltages measured on working product (after turning on) ===
@@ Line 159: / Line 169: @@
 |-
 |CN1600
-|8
+|9
 |UART_RX
 |
@@ Line 178: / Line 188: @@
 |Short this to ground to cause a main CPU reboot. (this is an open drain output of the voltage detector, so it's okay to short to ground)
 |-
-|CN2001
+|CN2001/CN1000*
 |2
 |Power Button
@@ Line 184: / Line 194: @@
 |}
+<nowiki>*</nowiki> not clear from the silk screen, please see images above
-==More Information/External Sources==
-You can manually link to external sources for additional information that might not fit here but are useful such as BIOS image dumps, firmware, etc!