IBM System/360 2050 - Page 108

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Test Point
Net No. line Title
JOO Nonoseconds/Oi\I
L3E7B08 GE 191 AG4
w
1
f-----
L4J4BIO GE 191AP4
w
1
l4G2B 12
GE 191AJ4
1
r
L3f6D04
GEl91BA4
-Early and
h
r
I---·
R.!:.fi Reset
L3C2Dl2 'GE 191AQ4
1
J
L3C2D 10
GEl91AR4
-Ch Reset
L3C2D04
GEl91AS4
f-------
l3F6D I 0
GE 191AZ4
-Early
h
_f
Reset
K4h7D06 GBl71AQ4
-Trf to
l_
~
L4L4B08
GB 171 BC4
Pas Reg
14G4DIO (Bl71AS4
+ Req
_J
L_
Reg Trf
N4G7Dl2 rMICIAQ4
N4G7DIO GMIOIAR41 t B Reg
~
l
N3H2D 12 GM 10 I AS41 Set
N3H2DIO GMIOIAT4
'
N4G6Dl2
f:;MI I IAY4
N4G.\DIO pM111AZ4 +C Reg
N3f4D 12
PMI 1 IBA4
Set
l.--I
l
N3F4D 10
GMl 1 IBB4
r--r
I I
FIGURE 100 RESET PULSES (CLOCK NOT RUNNING)
Poge and
~t
Net No_
L3E7B08
I GE l91AG4
I
l4J4BIO GEl91AP4
f-----·
0
line Title
w
I 2 3 4 5
6
7
100 Nanoseconds/Div
l
l
l4G2Bl2 GE191AJ4
l.__ __ __._r-1
~~~~~~t-_E--19-IB_A_4--1--;!_:'_~_:_":1_,r---i.__ _________ ~_i-------l
L3C2Dl2 j~E191A04 '--------
l3C2DIO GE 191AR4 -Ch Reset 1 _i-------1
L3C2D04 GE 191AS4 '------'
L3F6Dl0 GE 19JAZ4 -~:~
K4H7D06 GB 171 A04 - hf to
L4L4B08 GBl71BC4 PosReg
L4G4D!O GB17!AS4
N4G7D12pM10JAQ4
N4G7D!OpM101AR4
N3H2D 12icM10 IAS4
N3H2D 10 f:'Ml01AT4
+Req
Reg hf
+ B Reg
Set
N4G6Dl2GMI1 IAY4
N4G6010GMI1 IAZ4 +C Reg
N3F4012 GMlllBA4 Set
N3F4010 GMll1BB4
h.__ __ ___.r
_[
r
FIGURE 101. RESET PULSES (CLOCK RUNNING)
l...__ __ ~_r
r
L
l
A-Clock Check
Add jumper from XM4H7D04 to ground.
1. Set check switch to disable position and rate
switch to process position.
2. Sync scope on L3E7B08 minus external; set
first pulse on Figure 102 to zero time.
3. Press system reset to time pulses; check all
points in Figure 102; ensure that clock is running.
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0
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8
Test Point
Net No. line Title
100 Nanoseconds/Div
K4C3808
GF121AA4 -Inst Scan
h
r
K4D5010 GAIOIPB4 1 A Clk
~
K4F7D06
GA101AN4
+ Dly _J[_
A Clk
K4D6004
GAlllAE4 •Clk AO
~
K4D5B07 GAIOIAJ4
1 A Clk
r
A Latch
K4D4D12 GAi 1 IAF4 •Clk Al
IL.__.
K482802
CAIOIAV4
•A Clk
I
1
B latch
--
K4D5D06 GA:01AL4
•A Clk L----J----i__ __
D Latch
K4F7B 12 GAIOIBF4
-AOly A
Clk D latch
K404DIO
GAlllAG4 tC1kStep
FIGURE 102. A CLOCK
Cycle Counter Check
1. Set check switch to disable position and rate
switch to process position.
2. Sync scope on L3E7B08 plus external; set first
pulse on Figure 103 at zero time.
3. Check all points in Figure 10.3.
B-Clock Check
1. Set check switch to disable position and rate
switch to process position.
2. Sync scope on L3E7B08 plus external; set first
pulse on Figure 104 at zero time.
3. Add a temporary jumper between K4M4D07 and
K4H7D10.
4. Check all points in Figure 104.
5. Remove jumper installed in step 3.
Tag Generator and Manual Stop Controls
1. Repeat steps 1 and 2 of preceding "B Clock
Check."
Service Checks, AdjW1trnent and Removal Procedure (3/71) 107