First thing I would do it make sure your slot is clean.
The CR pins on the slots are input pins on all those F253 chips on the outer edge of the slot board. The F253s are 4:1 multiplexers (2 sets), so for example the CR0 pin from each slot will go into the same F253, the F253 will pick the correct CR0 input (based on which slot is suppose to be active) and forward it along to the output pin, which gets sent to the cpu board via one of those large interconnect between the boards.
I dont have the mapping for slot 1 cha board, but I do have it for slot 2. All the CR pins from a slot should land on the same 2 pins on the F253s. It looks like for slot 2 that's pin 5 and 11. You will need to figure out what those 2 pins are for slot 1 and adjust the following info accordingly. Then I would suggest doing logic probe tests on the F253s to make sure you are seeing signal for the slot 1 inputs and that the output mimic what you get on the input.
Code:
SLOT 2:
CHA (CTRG3)
01A <=> GND
02A <=> GND
03A <=> PIN 12 on LS244 @ E4
04A <=> PIN 14 on LS244 @ E4
05A <=> PIN 16 on LS244 @ E4
06A <=> PIN 18 on LS244 @ E4
07A <=> PIN 09 on LS244 @ E4
08A <=> PIN 07 on LS244 @ E4
09A <=> PIN 05 on LS244 @ E4
10A <=> PIN 03 on LS244 @ E4
11A <=> PIN 12 on LS244 @ E3
12A <=> PIN 14 on LS244 @ E3
13A <=> PIN 16 on LS244 @ E3
14A <=> PIN 18 on LS244 @ E3
15A <=> PIN 09 on LS244 @ E3
16A <=> PIN 07 on LS244 @ E3
17A <=> PIN 05 on LS244 @ E3
18A <=> PIN 03 on LS244 @ E3
19A <=> PIN 05 on F253 @ B1
20A <=> PIN 05 on F253 @ C1
21A <=> PIN 05 on F253 @ D1
22A <=> PIN 05 on F253 @ E1
23A <=> PIN 05 on F253 @ F1
24A <=> PIN 05 on F253 @ G1
25A <=> PIN 05 on F253 @ N1
26A <=> PIN 05 on F253 @ P1
27A <=> PIN 05 on F253 @ R1
28A <=> PIN 05 on F253 @ S1
29A <=> VCC
30A <=> VCC
31A <=> VCC
32A <=> VCC
33A <=> PIN 05 on F253 @ A7
34A <=> PIN 05 on F253 @ B7
35A <=> PIN 05 on F253 @ C7
36A <=> PIN 05 on F253 @ H7
37A <=> PIN 05 on F253 @ J7
38A <=> PIN 05 on F253 @ K7
39A <=> NC
40A <=> NC
41A <=> NC
42A <=> PIN 19 on LS245 @ G3/G4/H5/H6/F5 (also connects to 42A on PROG slot2)
43A <=> PIN 12 on LS244 @ E6
44A <=> PIN 14 on LS244 @ E6
45A <=> PIN 16 on LS244 @ E6
46A <=> PIN 18 on LS244 @ E6
47A <=> PIN 09 on LS244 @ E6
48A <=> PIN 07 on LS244 @ E6
49A <=> PIN 05 on LS244 @ E6
50A <=> PIN 03 on LS244 @ E6
51A <=> PIN 12 on LS244 @ E5
52A <=> PIN 14 on LS244 @ E5
53A <=> PIN 16 on LS244 @ E5
54A <=> PIN 18 on LS244 @ E5
55A <=> PIN 09 on LS244 @ E5
56A <=> PIN 07 on LS244 @ E5
57A <=> PIN 05 on LS244 @ E5
58A <=> PIN 03 on LS244 @ E5
59A <=> GND
60A <=> GND
01B <=> GND
02B <=> GND
03B <=> PIN 12 on LS244 @ F4
04B <=> PIN 14 on LS244 @ F4
05B <=> PIN 16 on LS244 @ F4
06B <=> PIN 18 on LS244 @ F4
07B <=> PIN 03 on LS244 @ F4
08B <=> PIN 05 on LS244 @ F4
09B <=> PIN 07 on LS244 @ F4
10B <=> PIN 09 on LS244 @ F4
11B <=> PIN 12 on LS244 @ F2
12B <=> PIN 14 on LS244 @ F2
13B <=> PIN 16 on LS244 @ F2
14B <=> PIN 18 on LS244 @ F2
15B <=> PIN 03 on LS244 @ F2
16B <=> PIN 05 on LS244 @ F2
17B <=> PIN 07 on LS244 @ F2
18B <=> PIN 09 on LS244 @ F2
19B <=> PIN 11 on F253 @ B1
20B <=> PIN 11 on F253 @ C1
21B <=> PIN 11 on F253 @ D1
22B <=> PIN 11 on F253 @ E1
23B <=> PIN 11 on F253 @ F1
24B <=> PIN 11 on F253 @ G1
25B <=> PIN 11 on F253 @ N1
26B <=> PIN 11 on F253 @ P1
27B <=> PIN 11 on F253 @ R1
28B <=> PIN 11 on F253 @ S1
29B <=> VCC
30B <=> VCC
31B <=> VCC
32B <=> VCC
33B <=> PIN 11 on F253 @ A7
34B <=> PIN 11 on F253 @ B7
35B <=> PIN 11 on F253 @ C7
36B <=> PIN 11 on F253 @ H7
37B <=> PIN 11 on F253 @ J7
38B <=> PIN 11 on F253 @ K7
39B <=> PIN 05 on F253 @ L7
40B <=> PIN 11 on F253 @ L7
41B <=> PIN 05 on F253 @ M7
42B <=> PIN 11 on F253 @ M7
43B <=> PIN 05 on F253 @ N7
44B <=> PIN 11 on F253 @ N7
45B <=> PIN 05 on F253 @ P7
46B <=> PIN 11 on F253 @ P7
47B <=> PIN 12 on F244 @ F6
48B <=> PIN 14 on F244 @ F6
49B <=> PIN 16 on F244 @ F6
50B <=> PIN 18 on F244 @ F6
51B <=> PIN 11 on LS245 @ F5
52B <=> PIN 12 on LS245 @ F5
53B <=> PIN 13 on LS245 @ F5
54B <=> PIN 14 on LS245 @ F5
55B <=> PIN 15 on LS245 @ F5
56B <=> PIN 16 on LS245 @ F5
57B <=> PIN 17 on LS245 @ F5
58B <=> PIN 18 on LS245 @ F5
59B <=> GND
60B <=> GND