DavidJRichards / Aviation_DriftAngle_GroundSpeed_Indicator

Decca 5841-99-622-9212 Type 9308WN28WM

Drift Angle & Ground Speed Indicator

Decca 5841-99-622-9212 Type 9308WN28WM

Note: none of these details are verified correct, WIP

PLA Connector

Details as seen from rear when unit level, connector is skewed from standard.

Outer row	Wire	Term		Middle row	Wire	Term
		------------	----------
A	red-59	rly2:coil a		U	pink-95	Pot1
B	pink-62	rly7:Com		V	pink-89	18 unknown
C	black-96	tran9:		W	red-91	rly6:coil b
D	pink-120	40-fp112		X	pink-74	S-black7
E	n/c			Y	pink-80	S-red9
F	pink-70	31 Test sw1		Z	red-90	rly6:coil b
G	pink-63	rly5:NC		a	pink-58	41 unknown
H	pink-44	rv1		b	n/c
J	pink-45	rv2, C2, C3		c	pink-64	17 Mem. sw
K	pink-81	14 unknown		d	n/c
L	pink-73	32 Test sw2		e	n/c
M	n/c
N	n/c			Inner row	Wire	Term
P	n/c			f	pink-119	39-fp111
R	red-60	DC in red		g	black-93	chassis
S	pink-121	113-fp		h	black-84	78,79,black
T	pink-61	rly7:Com		j	pink-122	38-fp114

Unknown:

where does 'K' t14 pink-9159 go to ? where does 'V' pink-89 go to ? where does 'a' t41 pink-124 go to ?

Notes:

• B&T connected,
• W&Z connected
• R main DC +ve feed to amp
• C, W, g, h, common -ve
• Front panel bulbs all open circuit!
• 26 V 400 Hz input pins chassis and B or T
• Signal input pins ?

Back panel

note: link 16 to 19 (pink-76) to 'PLA' c' link 6 to 7(bare wire) link 15 to 20(pink-75)

3
4
6 & 7	black-52,C10-?,C11-?	'h'
8	black-98,black-22,C8-?
9	pink-21,pink-43,C8
10	pink-44,pink-46,C10	'H', RV1
11	pink-45,C11
12	X1-black7,pink-74
13	S-red9209,pink-80
14	pink-9159,pink-81	'K'
15 ?	pink-77,pink-78,C2-?	to S-black17, S-red5
15	pink-75,S-white3,C2
16	pink-76,pink-77,C?	C2 to pink-75, 'J'
17	pink-65,pink-64	'c' mem switch to chassis
18	pink-97,pink-86	Resolver-S7,Pot2-wiper
19	pink-77,pink-76,C3-?	via C3 to
20	pink-75,yellow-7147,C3	'J' 50 ohms to chassis
E1	black-125,black-93	chassis

Transformer

Pin#	Wire
1	n/c
2	link to 8
3	n/c
4	pink-40	TR2-c
5	n/c
6	n/c
7	pink-41	TR3-c
8	pink-39	71,red (DC+ve)
9	black-42	to resolver 26v
10	black-43	to resolver 26v

No.1 PCB

Term	Wires
71	red-55,red-88	DC
72	black-92	Chassis E2
73	pink-57	TR1 input
74	black-91,black-42	Transformer9
75	black-33,black-96	Pot3
76	pink-54	R7,C to SL201-2
77	pink-31,pink-97	Resolver-S7,Pot2-wiper
78	S-blue7167,black-85	?
79	black-52,black-84	T6&7 'h'
80	pink-32,pink-95	Pot1 'U'
81	pink-53	R5-1k8,C to SL201-3
82	pink-41	TR2-c,Transformer7
83	pink-40	TR3-cTransformer4
84	pink-28	Resolver R2
85	pink-27	Resolver R1
86	pink-56	R10-10k

No.2 PCB

Term	Wires
31	pink-69,pink-70	Test sw1
32	pink-72,pink-73	Test sw2
33	S-green8,S-red/black9
34	S-lime18,S-red/black19
35	X1-blue767,pink-83
36	X1-brown1,pink-82
37	pink-117,pink-121
38	pink-118,pink-123
39	pink-115,pink-119
40	pink-116,pink-120
41	pink-58,pink-124
53	pink-53, R5-1k8
54	pink-54, R7-1k8
55 -	pink-39,pink-123	link DC
56 -	red-59,red-60	link DC 'A'
57 -	red-89,red-55	link DC
58	pink-56,R10-10k
59	pink-57,R21-1K	to Cx - TR1
60	pink-25,R21
61	pink-29,R12-2k2
62	pink-50,R12
63	pink-24,pink-97	Pot2-wiper,Resolver-S7
64 -	pink-78,pink-79	link '?'
65 -	S-black17,X1-red5	link '?'
66	black-94	chassis

RLA Relay

24 Volt, 830 Ohm

Pin	Wire
1	n/c	NC-8
2	red-89	coil-a
3	pink-103	Com-1&8
4		NO-7
''	orange-11	synchro GEN 26V
''	orange-1	synchro GEN 26V
''	pink-17
5	pink-63	NC-7
6	red-90	coil-b
''	red-91
7	pink-61	Com-4&5
''	pink-62
8	pink-79	NO-8

Misc Bindings

Terminal	Wire	Function
t113	pink-121	fp
t39,t111	pink-119	fp
t38,t114	pink-122	fp
chassis E1	black-125, black-93
chassis E2	S-grey12, S-white13, S-grey2, S-white747
chassis E2	black-92, black-94, black-125
chassis E3	S-black-67, S-black-37	Flag motor?
RV1-1	pink-46
RV1-2	pink-30
RV2-1	pink-47
RV2-1	pin-50
TestSw1	pink-71
TestSw2	pink-68
MomSw1	pink-66
MomSw2	black-68	chassis

X4 Drift Resolver Compensating

Name	Wire
S1	pink-21	transformer #10
S3	black-22	transformer # 9,chassis
S2	link to	S2-S4 linked
S4	pink-26	S2-S4 linked
S5	pink-25	R21
S7	pink-24	Resolver-S7,Pot2-wiper
S6	link to	S6-S8 linked
S8	pink-30	S6-S8 linked
R1	pink-27	to Cx - TR2
R3	pink-29	R12
R2	pink-28	to Cy - TR3
R4	pink-30	RV1-2

X5 Speed Potentiometer

2k ohms 5%

pin	wire
1	pink-32
2	pink-31
3	black-33

X1 Speed Servo Tachometer

200:1 gearbox

Colour	Terminal	Wire
yellow
white
red	65	X1-red5
red/black
green
black	12	X1-black7
orange
grey		51r to chassis
blue	35	X1-blue767
brown	36	X1-brown1

X2 Drift Servo Motor Tachogenerator (blue)

• SM | Y-W 26V| R-R/BK 13V | G-BK 13V
• GEN | O-GY 26V | B-BN 0.285V/1000 RMM

code	colour	terminal
Y	yellow	SM 26V	yelow7147
W	white	SM 26V	chassis
R	red	SM 13Va
R/BK	red/black	SM 13Va
G	lime-green	SM 13Vb
BK	black	SM 13Vb
O	orange	GEN 26V	to relay4
GY	grey	GEN 26V	chassis
B	blue	GEN RPM
BN	brown	GEN RPM