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Bit
Location
Pin
Pir.
f -
I
B-A3K4
D05
D06
2
B-A3K3
Dll
BIO
3
B-A3K3
B03
B04
4
B-A3K4
D04
B05
5
B-A3K3
Bl 3
Dl3
FIGURE 97. SP SENSE WINDING TEST POINTS
Termination Diodes
The termination diodes (steering diodes) for the
storage protect storage are located on the array
boards.
They are not shown on the logic pages.
Remember that there are diodes in the driver lines.
Two types of diodes exist: 03El (part number
2414884), and 03E2 (part number 2414885). There
are 16 of each type.
X and Y Drivers
Figure 98 shows the location and test points of the
storage protect X and Y drivers.
j
Write Pin
Locotion
Read Pin
line Name
f-------+-----
1 - - - - - - -
DIO
I
A3J2
B05
I
Y0,2,4,6
BOB
I
A3J2
B04
Y8, 10, 12, 14
D05
I
A3J2
Dl2
Y line in 1N,3N,5N,7N
. D06
A3J2
Bl3
Y line in 9N, l IN,
13N,
!5N
Y Rd on Read Y WG on Write
B05
AJL2
010
ON,T,SN,9
B04
I
AJL2
BOS
2N,3, TON, I I
012
AJL2
BOS
4N,5, 12, 13
Bl3
AJL2
D06
6N,7, 14N, 15
Y Drivers
Write Pin
Location
Read Pin
Line
Nome
DIO
A3J5
B05
X0,2,4,6
BOB
A3J5
B04
XS, 10, 12, 14
D05
A3J5
Dl2
IN,3N,5N,7N
006
A3JS
Bl3
9N, I IN, 13N, i5N
Y Rd on Read X WG on Write
B05
AJL5
DIO
ON, I ,SB,9
B04
A3L5
BOB
2N,3, ION, 11
Dl2
AJL5
005
4N,5, 12N, 13
BlJ
A3L5
D06
6N,7, 14N, 15
X Drivers
FIGURE 98. STORAGE PROTECT DRIVER LOCATIONS
Storage Protect Test Points
Following are some common test points for the
storage protect storage.
Sense Gate
Inhibit Timing
Strobe
Read Gate
Write Gate
B-A3J4!!04
B-A3J7DOS
B-A3K6B12
B-A3K6B13
B-A3K6D02
CHANNEL SERVICE CHECKS
The material in this section can be used to adjust
delays and singleshot timings and to check for proper
circuit operation of the selector channel and the 1052.
SELECTOR CHANNEL
Figure 99 outlines the maintenance approach for
servicing the selector channel when a malfunction is
suspected. Procedures are outlined for progressive
scan and non-progressive scan diagnostic techniques.
When trouble is suspected in a specific area of
the selector channel, the following checks can be
used to pinpoint or correct the malfunction.
C Reg Set and IF Service Out Delays
1.
Set check switch to disable position. Manually
store the following program; press PSW restart push-
button. The program should be looping.
Location
Data
Symbolic
0000
*O 00 00 00
PSW
0004
00 00 01 00
PSW
0048
00 00 02 00
CAW
0078
*O 00 00 00
PSW
007C
00 00 01 00
PSW
0100
9COO
otxx
SIO
0104
47FO 01 04
Branch to its elf
0200
04 00 03 00
ccw
0204
00 00 00 06
ccw
* Enable
t
Channel Tested
XX Available Tape
or
Disk
2. Sync scope plus on rise of IF service in line
at 01X-N4K7D04 (0 time).
3. Observe C reg set line (01X-N4G6D12) falls
at 340ns. Adjust delay at 01X-L4H2 bottom.
4. Observe that IF service out line (01X-N4L7D05)
falls at 215ns. Adjust delay at 01X-N3E2 bottom.
Channel Reset
1.
Set check switch to disable position and rate
switch to process position.
2. Sync scope on L3E7B08 plus external.
3. Press system reset
to
time pulses; check all
points on Figure 100.
4.
If
clocks are running, use Figure 101 for refer-
ence.
Service Checks, Adjustment and Removal Procedure
(3/71)
103
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