2. Enter Command Letter 'E', carriage return (or spacebar), to dis-
play Error Table on screen.
4. Enter Command Letter 'C', carriage return (or spacebar), to initi-
ate continuous testing.
2. Enter Command Letter 'P', carriage return (or spacebar), to initi-
ate PORT Test.
Almost immediately a matrix similiar to Figure 5-9 will be displayed
on the screen. In the lower four video lines on the screenr outlined
in reverse video, will appear the prompt PORT TEST, indicating one
complete test sequence. To continue testings do nothing. To stop the
test, hit carriage retnrn (or spacebar) and the testing will stop at
the completion of the present test.
The Error Table displayed should be all zeroes, if a one (1) a ppears
in any portion of the matrix an error condition exists. Record the
error location and refer to paragraph 5.4, Troubleshooting.
NOTE
A blinking one (1) in position A-5 of the Error Table may not
signify an error condition. A software error exists in the
Stand Alone Test Program. The signal in question is the motor
control line and will be more thoroughly tested in the Program
Cassette Recorder Test.
TONE TEST
The TONE Test checks the sound generation Circuits of the Consoles
and each of the four sound registers for tone and volume control. The
volume on the television set should be set in the middle of the range
for this test. The TONE Test must be run in its entirety for each of
the four sound registers.
Proceed as follows:
1. Enter Command Letter 'T', carriage return (or spacebar), to initi-
ate TONE Test.
2. Enter sound register number (1 to 4) to be tested when prompted by
the screen display.
Eight tones are generated in succession, starting with the highest
pitch down to the lowest. The first three tones are very high fre-
quencies and may be inaudible to some people. Each tone starts at
maximum volume and 'fades' to minimum volume.
The complete TONE Test, steps 1 and 2, should be run for each of the
our sound registers.
5-16 System Service Manual
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