DB-25 line descriptions

DB-25 line	Role	To
1	Stepper A	Main 3
2	Stepper B	Main 20
3	+5 Volts	Main 7 (also 1,2,18,19 through 20 Ohms)
4	Auxiliary D (role?)	Jumper 2
5	HV to piezo (-Y)	Piezo 5
6	NCAFMJM pin 2 (role?)	Main 8
7	HV to piezo (-X)	Piezo 9
8	Piezo/head chassis ground	Peizo 1; Head 13; Jumper 8
9	-15 Volts	Main 26
10	Analog 2 (gain select)	Main 17, Jumper 6
11	Vertical cantilever deflection	Main 15
12	Green loop (photodiode ground?)	Main 27
13	BB2107 pin 5 (2+) though R (role?)	Main 9
14	Manual switch mode AFM/LFM (+5 Volts?)	Switch 10
15	Stepper C	Main 4
16	Stepper D	Main 21
17	Head Gnd?	Head 1
18	HV to piezo (+Y)	Piezo 4
19	Main board ground	Main 5
20	HV to piezo (+X)	Piezo 8
21	Horizontal deflection	Main 33
22	HV to piezo (+Z)	Piezo 6
23	NCAFMJM pin 3 (role?)	Main 25
24	+15 Volts	Main 10
25	AD620 pin 2 (in -) through R (role?)	Main 31

Main board line descriptions

Main line	Role	To
1	Stepper C, from DS3658N pin 6	Stepper Black
2	Stepper A, from DS3658N pin 1	Stepper Brown
3	Stepper A? in	DB-25 1
4	Stepper B? in	DB-25 15
5	Main board ground (black loop)	DB-25 19
6	Manual stepper switch direction	Switch Purple
7	+5 Volts	DB-25 3
8	NCAFMJM pin 2	DB-25 6
9	through R to BBOPA2107 pin 5 (+2)	DB-25 13
10	+15 Volts	DB-25 24, Head 5 though 10 Ohms
11	Photodiode D	Head 11
12	Photodiode A	Head 9
13	DG403 pin 10
14	internal plane, but not ground loop?
15	Vertical cantilever deflection 620 pin 6 (out)	DB-25 11
16	DG403DJ pin 6	DB-25 11
17	Gain select DG 419pin 6 (through R)	DB-25 10
18	Stepper D, from DS3658N pin 8	Stepper Orange
19	Stepper B, from DS3658N pin 3	Stepper Yellow
20	Stepper C? in	DB-25 2
21	Stepper D? in	DB-25 16
22	AD827(far) pin 7 (out) (Tapping-piezo voltage)	Head 15, tipholder 6
23	Green loop	Head 14
24	Manual stepper switch enable	Switch grey
25	NCAFMJM pin 3	DB-25 23
26	-15 Volts	DB-25 9, Head 7 through 10 Ohms
27	Green loop	DB-25 12
28	Photodiode ground (green loop)	Head 2
29	Photodiode C	Head 10
30	Photodiode B	Head 8
31	AD620 pin 2 (in -) through R	DB-25 25
32	BBOPA2107 pin 1(out1) through R(total photodiode)
33	DG403 pins 1 and 3 (drains from 1)(Horizontal deflection)	DB-25 21
34

Chip list

(following this numbering)

Index	Chip	Description	Role
1	DS3658N	Current sink.	Stepper motor current sink
2	H7555IBA	CMOS timer.	Manual stepper motor control clock
3	"NCAFMJM"	?	Stepper motor
4	AD827JN	Dual op amp.	Far side amplifies tapping piezo signal (out Main 22)
5	Scratched out	?	Stepper motor?
6	Scratched out	?	Stepper motor?
7	AD534KD	Difference multiplier (X1-X2)(Y1-Y2)/(10V)+Z2.	Photo-diode?
8	AD734BQ	Identical to AD534, but with control over denominator.	Photo-diode?
9	SG531P 25.0000 M	25 MHz crystal oscillator.	Photo-diode?
10	BBOPA 2107AU	Dual op amp.	Photo-diode?
11	DG419DJ	CMOS analog switch.	Photo-diode?
12	DG403DJ	CMOS analog switch.	Photo-diode?
13	AD534JD	Identical to AD534KD, but with slightly more error.	Photo-diode?
14	AD637JD	RMS-to-DC converter.	Photo-diode?
15	AD620AR	Instrument amplifier.	Photo-diode?
16	BBOPA 2604AU	Op amp.	Photo-diode?
17	DG411DJ	Quad CMOS analog switch	?

Main board wiring

Vertical deflection (Main line 15) comes from pins 6 and 8 (shorted together) of the DG403 switch. Pin 6 drains pin 5 and pin 8 drains pin 9 when the switch is turned on. I'm not sure what pin 5 is attached to. Pin 9 is connected (through a resistor) to the output (pin 12) of AD534a.

Manual switch connector line descriptions

See my switch notes for details on understanding the stepper control switch.

Line	Color	Role	To
1	Orange	Laser LED ?
2	White-red	STM mode LED	DB-25 17
3	Green	Mode TM	Main 13
4	Blue	Mode STM	120 Ohms to DB-25 17
5	Purple	Stepper direction	Main 6
6	White-brown	Stepper switch +5 Volts	Main 7
7	White	Laser LED?	DB-25 17
8	Yellow	Laser LED?
9	White-brown	STM mode LED	160 ohms to DB-25 17??
10	Red	Mode AFM/LFM, +5 Volts	DB-25 14
11	Grey	Stepper enable	Main 24
12	Black	Stepper switch Gnd	Main 5

AFM head micro-D 15 connector line descriptions

outside female from top-left: 8 7 6 5 4 3 2 1/15 14 13 12 11 10 9

inside male (on board) from bottom-right: 8 7 ... 1/9 10 11 ... 15 blank

Line	Role	To
1	Laser Ground	DB-25 17
2	Photodiode ground	Main 28
3	+5 Volts Laser Power	no main, no DB-25 ??
4
5	+15 Volts	DB-25 24 through 10 Ohms
6	STM current?	Jumper 1, tipholder 2
7	-15 Volts	DB-25 9 through 10 Ohms
8	Photodiode B	Main 30
9	Photodiode A	Main 12
10	Photodiode C	Main 29
11	Photodiode D	Main 11
12	AFM tip	Jumper 3, tipholder 4
13	Chassis ground	DB-25 8, Jumper 8
14	Tapping-piezo ground (main board shorts to photodiode ground)	Main 23, tipholder 5
15	Tapping-piezo voltage	Main 22, tipholder 6

(see, e.g. Glenair for Micro-D-Subminiature connector descriptions.)

AFM head to tipholder line descriptions

Labeled looking down on tipholder along laser, with MultiMode LCD at bottom from top-left: 1 2 3/4 5 6

Line	Role	To
1	+12 Volts	?
2	STM current?	AFM connector 4
3	-12 Volts	?
4	AFM tip?	AFM connector 12
5	Ground	AFM connector 14, main 23, main board shorts to photodiode ground
6	Tapping-piezo voltage	AFM connector 15, main 22

On our tapping-in-air tipholders, removing the connector-pad plate shows lines 1-4 are not connected to anything. Lines 5 and 6 have wires heading over towards the piezo, as you would expect. On our tapping-in-fluid tipholders, the pad is not removable, but the only wires leaving the pad area connect to the oscillating piezo region, so both tipholders have identical interfaces to the head, with 5/6 providing piezo oscillation and 1-4 as non-contacts.

Since both tapping mode pins are shorted through the head to the main board, but not to the DB-25 connector to the NanoScope, we assume the tapping oscillation is being generated on the MulitMode main board itself.

Piezo connector line descriptions

outside male from top-left: 1 2 3 4 5/6 7 8 9

inside male (on board) from top-left: same + blank

DB-25 labeled HV: 5,7,18,20,22

Line	Role	To
1	Ground	DB-25 8, Jumper 8
2		no db
3		no db
4	+Y piezo	DB-25 18
5	-Y piezo	DB-25 5
6	+Z piezo	DB-25 22
7	Piezo cap	Jumper 7
8	+X piezo	DB-25 20
9	-X piezo	DB-25 7

Jumper pin descriptions

inside male from top-left: 1 2 3 4 5 6 7 8

Roles from MultiMode manual, 14-9

Pin	Role	To
1	STM current	Head 6
2	Auxiliary D	DB-25 4
3	AFM tip	Head 12
4	Analog 2	DB-25 10
5	Gain Select	Main 17
6	Analog 2	DB-25 10
7	Piezo Cap	Piezo 7
8	Ground	DB-25 8, Piezo 1, Head 13

LCD connector descriptions

inside male from top-left: 1 2 3 4 5 / 6 7 8 9 10

Pin	Role	To
1	Manual switch AFM/LFM, +5 V	DB-25 14
2	Total photodiode voltage	Main 32
3	-15 Volts	Main 26
4	+15 Volts	Main 10
5	Manual switch STM mode	Switch 9
6	Head Gnd?	DB-25 17
7		Main 16
8	Green loop	Main 27, DB-25 12
9		Main 13
10	Horizontal deflection	Main 33

LCD board

inside male from top-left: 1 2 3 4 5 / 6 7 8 9 10

Pin	Role	To
1	+5 V	Big regulator
2	Total photodiode voltage
3	-15 Volts
4	+15 Volts
5	Manual switch STM mode
6	Head Gnd?
7		Main 16
8	Ground	Black loop
9
10	Horizontal deflection	top center BBOPA though R