Heathkit Model PT-1500

Darkroom Timer

Check Out Procedure

· The PT-1500 Darkroom Timer does not require calibration, only a functional check.

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INITIAL SETUP

Refer to Pictorial 3-1

Construction Manual, page 35

(    )         Disconnect the unit from the AC line voltage.

(    )         Unplug all accessories from the sockets on the top of the unit.

(    )         Remove the bottom cover from the unit.

(    )         Position the chassis with the front display panel facing down.

(    )         Adjust the DIMMER control R32 [top – right] to maximum clockwise.

(    )         Set the DISPLAY switch SW1 [top – right] to the ON position.

(    )         Adjust the VOLUME control R46 [circuit board – right] to the center of rotation.

(    )         Disconnect the jumper [circuit board – right] from the NORM socket.

(    )         Connect the jumper [circuit board – right] to the TEST socket.

(    )         Position the chassis with the front display panel facing up.

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MICROPROCESSOR SELF TEST

Refer to Pictorial 3-3

Illustration Booklet, page 7

· Several things are going to happen in a short time. To repeat the sequence, unplug the unit from the AC line voltage. Wait a few seconds, and then reconnect the unit back to the AC line.

(    )         Connect the unit to the AC line voltage.

(    )         The front panel should display the following:

v Each segment of the five displays [starting at the left] should light.

v All segments in a given display should light individually, and then stay lit, before the next display goes through its cycle.

v When all of the segments in all of the displays are lit, the display should look like drawing #1 on the Pictorial.

v The SEC indicator should be lit.

v The display will change almost instantaneously to drawing #2 on the Pictorial.

v Both the MIN and the SEC should be lit.

v The LED above the ENGLR key should be lit.

v The three LEDs on the circuit board should light and stay lit.

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KEYPAD TEST

· Hold the individual Key down. A quick “beep” should be heard and the display should indicate as shown in the Response column.

Key Response Key Response

(    )         ENLGR                    E  18                            (    )         9                               E  09

(    )         PROC                       E  23                            (    )         OFF                          E  11

(    )         0                               E  00                            (    )         END                         E  10

(    )         L                               E  17                            (    )         1 SEC                       E  21

(    )         *                               E  19                            (    )         30 SEC                     E  22

(    )         1                               E  01                            (    )         60 SEC                     E  13

(    )         4                               E  04                            (    )         STEP                        E  16

(    )         7                               E  07                            (    )         CLEAR                     E  24

(    )         2                               E  02                            (    )         HOLD                       E  14

(    )         5                               E  05                            (    )         FOCUS                     E  12

(    )         8                               E  08                            (    )         CLOCK                    E  15

(    )         3                               E  03                            (    )         START                     E  20

(    )         6                               E  06

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(    )         Disconnect the unit from the AC line voltage.

(    )         Position the chassis with the front panel facing down.

(    )         Disconnect jumper from the TEST socket.

(    )         Connect jumper to the NORN socket.

(    )         Operational check out is complete.