GENERAL TEST EQUIPMENT

A list of tools and test equipment necessary to service the 1800 Data Acquisition and Control System is given in the Appendix.

2.11.1 I/O Monitor Unit

The I/O monitor unit is a service tool capable of displaying the status of registers, latches, and control signals in I/O de-vice attachments while the I/O dede-vice is stopped or in oper-ation.

Information concerning the I/O monitor unit is in the Field Engineering Theory-Maintenance Manual, IBM 1800 Data Acquisition and Control System, I/O Monitor Unit (See FE Bibliography -1800 System, Order No. SY26-0550.) 2.11.2 Oscilloscope

The scope used on the 1800 system should meet or exceed the specifications of the Tektronix Model 453 Oscilloscope.

2.11.3 CE I ndicator Latch Card (P/N 5801358)

An optional CE indicator latch card (Figure 2-4) is available from Mechanicsburg as a troubleshooting aid for SLT ma-chines. Thirty-three inch jumpers (PIN 4203785) with SLT connectors for use with the latch card and replacement lamp assembly (P/N 5711078) are also available as needed.

The CE latch is a 2-12 SLT card which plugs into the pin side of the SLT board. It can be plugged into any two ver-tically adjacent locations except edge connectors. The card is intended for use in socket locations with no discrete wir-ing; however, with care, it can be used in socket locations with no more than one discrete wire wrap on any pin. If the card is left on the SLT board for extended lengths of time, normal machine vibrations may cause it to work out on the pins and lose contact.

Plugging the card into the board provides voltages (+3, -3, +6) and ground only. The card was designed for use with medium- and high-speed SLT circuits which require +3 volts on pin D03.

CAUTION

Slow-speed circuits have +12 volts on pin D03. If there is any doubt, measure pin D03 with a volt-meter or scope.

The card must be plugged in with the lamp on top and the modules on the right. If the card is

plugged in upside down or in the card side of the board, circuit damage may result.

The card extends far enough to cause damage if gates are closed with card installed.

Reset SYNC -SYNC +

{

High Imped +

In AND +

Condition + +

+

{

High Imped

-In AND +

Condition + +

+

High Imped-o----\

+o---~

+ A

+o---~

+o---~

High Imped+o----I

+ 0 - - - 1 A + 0 - - - 1

+o---~

+o---~

Reset-o---~

Reset Key

Figure 2-4. CE Indicator Latch Card A

OR

1800 FEMM (2/10) 2-13

The CE latch has an indicator bulb, a reset switch, a reset line, plus and minus sync points for scope triggering, and two five-legged AND blocks ORed to turn on the latch.

Inputs are brought to the card by jumpers.

Note: If only one input to an AND block is to be used, it must go to the high-impedance input. If two or more inputs are used, one must go to the high-impedance input. These high-impedance inputs are so designed that the CE latch is not set if the input is floating.

The CE latch can be used in a variety of ways. Some of them, with examples, are listed below.

1. Baby Sitter: To find out if several inputs are all plus at the same time, plug the card into the pin side of the SLT board and jumper the suspected lines to one of the AND blocks. Be sure that one of the jumpers goes to the high-impedance input. If all the lines go plus together, the latch will turn on and light the indicator. Reset the latch by pressing the reset button on the card.

2. Meter or Scope Substitute: A scope may show a line at or near ground level which mayor may not be floating. Jumper the line to the appropriate high-impedance input. If the line is floating, the latch will not set. If the line is not floating, the latch will set.

3. One-Time Pulse Detection: If a line should not change during'a particular sequence of events, jumper the line to the appropriate high-impedance input. For exam-ple, if the line is plus and should never go minus, jumper it to the minus high-impedance input. If the line changed value or had a pulse on it, the latch will turn on.

4. Scope Sync Point: The necessary signal lines for the syncing condition can be jumpered to one of the AND blocks. Jumper a reset signal, such as a clock pulse, to the reset line on the card. The latch will then turn on with the ANDing conditions and turn off under control of the reset line, furnishing a stable sync point.

The scope sync lead is plugged into the plus or minus 5.

sync point on the latch card.

Temporary Fix: Turn the latch on and niset as described in item 4. Use either the plus or minus sync output to condition circuit requiring the temporary fix.

2.11.4 Extender Card

HaVing available logic blocks to develop sync signals etc. is often helpful in servicing the 1800 system. The extender card (Fig. 2-5) is used to connect spare SLT cards to the pin side of an SLT board.

2-14 (2/70)

Use jumper wires to connect signals to the input pins of the spare card. The output pins make the newly developed signal available for use with the CE indicator card (2.11.3), I/O monitor (2.11.1), oscilloscope, etc. Use any spare SLT card that contains the desired functions; two extender cards are needed to connect a double SLT card. Four common SLT cards and their input and output pins are shown in Figure 2-6.

Part numbers:

Extender card - 5808354 Jumper IS" - 2197864 Jumper 36" - 2200079 CAUTION

Exercise care to ensure proper orientation of extender card and spare SLT card (Figure 2-5).

The CE indicator latch card must not be plugged into the extender card. The voltage pins on the CE latch card are only oriented for SLT backpanel plugging.

Do not plug the extender card into a cable connector position on the SLT board as the proper voltages are not present.

2.11.5 Seven-Position Binary Counter

Intermittent errors may be simplified or localized by means of this counter. Sequential movements of clocks or rings or the logical progreSSion of an adapter can be studied by this method of diagnosis.

As an example, Figure 2-7 shows the necessary connec-tions to determine the failing column on a 1442 data error problem. Because the counter starts at 0 and the card umns are numbered from 1, the number of the failing col-umn will be one more than the accumulated count.

~

5800040 or 5803794 (Trigger)

009 FF

007

809 FF

006

804 FF

002

5800319 or 5803130 (Lotch)

• Figure 2-6. Common SLT Cards

Part numbers:

AND/OR card

Seven-position binary counter Light indicator card

5800207

or 2.11.6 Remote Switch Box

5800000

The remote switch box (P/N 2105671) permits limited

con-~

⁰¹⁰ trol of the processor-controller from remote locations. The

013 switch box is provided with a 30-foot cable that can be

con-~

nected to the 1801/1802, 1826-1, or 1828-1. The 1826-1 and

809 and the 1828-1 are free-standing units that can be located at distances up to 100 feet from the processor-controller.

803 The remote switch box contains four control keys: start,

~

⁰⁰⁵ stop, immediate stop (causes dc reset), and CE interrupt.

~

These keys perform the same functions as do their

counter-006 parts in the 1801/1802.

D09 A

Cable connections for the remote start circuit are shown in Figure 2-8. Connections for the stop and CE interrupt are similar. The immediate-stop circuit uses only the norm-ally open and common connections.

Three connectors, A, B, and C, are provided on the 1801/

1802 power tailgate. The connectors are wired in parallel and can be used interchangeably. Cables to the remote uni~s

are normally plugged into connectors A and C, and a short-ing plug is placed in connector B. At each remote location, two interchangeable connectors are provided to receive the cable from the 1801/1802 and the cable from the remote switch box.

5800209 _or To use the remote switch box, the shorting plug is

re-5800004 moved and the remote switch box is plugged into the

availa-011

012 ble connector at the 1826-1 or 1828-1, or it may be plugged

813 into the 1801/1802 connector vacated by the shorting plug.

009 _A 810

809 The remote switch box cable must be disconnected when

006

007 it is not being used, and the shorting plug must be replaced

002 in the 1801/1802 connector.

804 805

803 _A 802 CAUTION

004 The processor-controller switches that are duplicated

808

807 by the remote switch box should not be used when

010 the remote box is connected, as their operation will

~

be unpredictable.

01

CE Phone Line

A two-conductor phone line is included in the signal cable to the remote switch box connectors. The line is terminated

J28114AJ at phtne jacks adjacent to the remote switch box connectors

in the 1801/1802,1826-1, and 1828-1.

- 5800000 - 5803793 - 5803975

The phone line permits voice communication between customer engineers at widely separated units, using IBM sound-powered phones.

With the phones disconnected, the phone line can be used as an extension of the meter leads for checking continuity of interconnecting machine cables. For external-sync or pulse-counter testing, the phone lines can be jumpered to TP 19-12 and TBI9-13 in the processor-controller to make the pro-grammed test signal available at the remote 1826.

1800 FEMM (2/70) 2-15

7 Position Binary Counter EN521 + Read 551 Gate

B 0 8 &

-Step 010 B12

A 006 B12 CTR

(DO

EN321 - Oata Error B13 007

009 009 009

Q)O

0000

004 B09

00

006 010

011 013

®O

013 B13

@O

0 0 7 8

-- Reset

A B07 B02

@@

EN841 + Feed CB2

B09

0000 3793 3975

112471 1

• Figure 2-7. Seven-Position Binary Counter

r- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ---1

Console 1801/1802 I

~

:

T. _...

^{A B C} _! ^Comm

)

B C N A B C N AJ

~ ~~ /\ 1\

U

^{B ~ C N /\ A ~}

.,

^{N/O N/C}

Shorting Plug

--- - - -- --- ---

^-

- - -

-

-- - --

-

-'--1826_-1-

-j

r - - - - - - - j

I 1828-1 ^I

I Connector Locations ^{I I}

I I I

Remote Start

I

) B

~ ^I

:>

C _A ^{~ I I}

;::. ((! ^I ________ J I

Figure 2-8. Cable Connections to Remote Start Circuit

2.12 PROCESS I/O TEST EQUIPMENT

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