Tag: Emailer

Main PCB

ID	Image	Marking	Purpose / Description	Spec Sheets
1		Sharp ARM LH79531 L216 01B	50MHz 32-Bit ARM7TDMI General-purpose SoC	Product Info DataSheet (local)
2		Atmel AT49BV512 15TC 0214	512K Flash Memory	DataSheet (local)
3		XILINX XC9572XL TQ100BMN0217 A1216699A 10C	High Performance 3.3v CPLD (Complex Programmable Logic Device)	DataSheet (local)
4		Conexant SCP LT L9403-11 E212479.1 0216 Mexico	Smart Modem IC
5		F Japan 30LV0064 0208 M38 PFTN	64Mbit CMOS NAND Flash (8Mbyte)	DataSheet (local)
6		EtronTech EM638165TS-7 F528059MQFC0359	64Mbit S-DRAM (8Mbyte)	DataSheet (local)
7		CONEXANT SMARTSCM/56 CX88168-11 E91871.1 0042 TAIWAN	Single Chip v90/k56Flex/V.34 Modem	DataSheet (local)
8		CYPRESS SL811HST 1.5 M1C9K-000 0209	Embedded USB Host Controller	DataSheet (local)
9		CONEXANT SMARTDAA 20463-11 E205287.1 0213 MEXICO	Modem Data Driver	See SmartSCM/56
10		CONEXANT 20437-11 E189607.1 0207 MEXICO	Modem Voice Codec	See SmartSCM/56
11 12		063AC 9221	Voltage Regulators	DataSheet
13		L 0228 MOC3023 Y	OptoIsolator	DataSheet
14		835-00086 EE 0222 CN3	? Isolation transformer ?	See SmartSCM/56
15		24AZ LM 358M	2 Channel Op Amp	DataSheet (local)
Underside		24AH LM386 M-1	Audio Amplifiers (2 of)	DataSheet (local)

Smartcard Reader

Rather advanced for a domestic product of the era, the em@iler included smartcard functionality that was expected to be used for payment or authentication cards.

The smartcard reader is based around a single chip:

Image	Markings	Purpose	Spec Sheet
	TDA8004T J82226 Jn0219 1	Smart Card Interface (superseded by NXP TDA8024)	TDA8004T (local) TDA8024

1. Remove the handset and qwerty keyboard.
   
2. Tip the device over, and remove the 4 screws shown.
   
3. Tip the device back over, and unclip the top trim.
   
4. Remove the small screw to the right of the qwerty keyboard
5. Gently split the case open.
   
6. Disconnect the keypad looms (2), screen ribbon and aux cables (2), ringer cable and hook switch cable.
   
7. After disconnecting the remaining cables, remove two screws to extract the Main PCB.
   
8. PCB can then be lifted from the can after bending back 6 retaining tabs.

The Screen has two screws in the back (hidden by rubber stoppers). With these removed, the rear can be wiggled away (there are 2 hook/clips at the top).

This exposes the Display, backlight inverter, and three sub PCB with the indicator LED’s and a button (these all connect back through the middle board to the Keypad PCB in the base.

The Left LED has a small capacitor, which connects back to the mainboard via a dedicated cable … it’s not obvious what purpose this serves!
The screen can be unscrewed, and the can opened by prizing back a number of tabs.

This separates with the backlight in one half and the TFT panel in the other, with a small driver board consisting of a couple Op-Amps (a VHC244-042 and a BA1032AAF).