Tektronix 4010 Maintenance Manual page 117

In the event of cable trouble, it may be necessary to
trace signals from point to point through all connectors.
Start with the connector and pin number. If it is a
harmonic connector, go to that connector in the Wire List.
If it is a board-edge connector, go to that connector on the
Mother Board diagram. Opposite the connector and pin
number is listed the interconnecting point or points.
Examples of Signal Tracing
Example 1. Follow H IY from TC-1 to its destination.
Since
RlV
is on an interchangeable board, its P202-J
connector is common to pin J on all cards connected to the
Mother Board, except A4 connected to J201. To determine
if the signal goes elsewhere, look on the Mother Board
diagram under minibus pin J. No other points are listed.
Example 2. Follow MAKE COPY, which is generated on
TC-1. Again, it is a connection on the minibus and goes to
Circuit Description-4010 Maintenance
pin C on all minibus connectors. Look on TC-2 and the
Interface card to determine if it is used there. Then check
the Mother Board diagram. It shows that minibus pin
C
also
connects to J201-B and J34-5. Going to J34 in the Wire
List shows that pin 5 connects to P93 in A8. Refer to A8
on the Display Interconnect Diagram. The Display Inter-
connect Diagram discloses that it connects through J92-2
to the Make Copy switch, which also is a source for the
signal. Since the Mother Board also indicated it connects to
J201-B, go to the Connectors diagram (Fig. 6-1) and
determine that P201 is on assembly A4. On the Hard Copy
Adapter schematic (part of A4), find MAKE COPY and
note that it leaves on J50-6. Refer to the Wire List and find
that J50-6 goes to pin 11 of J525, the Hard Copy Unit
connector plug.
Example 3. On the Keyboard schematic, locate
KSTROBE on P80-6. Go to the Wire List and find that it
connects to P21-2 on assembly A2, the TC-2 card. Refer-
ring to TC-2 confirms this.
WIRE LIST
From J1 and J2, CRT Connectors
From To
Plug Plug
and/or and/or Location/
Wire
Line Name Jack Pin Jack Pin Assembly Color Code
W.G.FIL
1 1 9-1
W.G.FIL 1
2 9-2
W.G. Cathode 1 3 Soldered to 9-3
CONTROL 1
4
Board A5
9-4
Focus 1 5 9-5
ANODE 1 1 6
9-6
ANODE 2 1 7
9-7
+20 V FIL
2 1
76
A6 2-3
-20V 2 2 78 A6
7-1
CE 2
2 3 32 7 A3 9-5
S.T.B. 2 4 32 3 A3
9-2 Coax
(See Note A)
F.G. ANODE 2 6 67 2 A5
9-4
F.G. CATHODE 2 7
32 5 A3 9-7
S.T.B. SHIELD 2 See Note B 32
1
A3 9-2 Coax Shield
(See Note C)
Spare 2 NC
32 2 A3 9-1 Coax
(See Note D)
Spare 2 NC 32 1 A3 9-1 Coax Shield
(See Note D)
Note A: Was 2-N shielded in early instruments.
Note B: Soldered to O-N wire which goes to ground lug on A-5.
Note C: Was 8-N shield in early instruments.
Note 0: Not contained in early instruments.
REV. B, APR. 1976
6-5