KeyPad
Version 1.0
SCP SCIENCE
77
To verify the over temperature protection switch
is closed, measure between pin 7 and pin 9: this
should return a resistance based on the resistance
of the heater mat (see table on page 88).
UMBILICAL CORDS, S104
The S104 umbilical harness is the power, and
communication medium between the block and
the controller. There are two formats of umbilical
cords: the new version includes Jr blocks with
s/n JR640404137 forward, HP Blocks with
s/n 9241030022 forward, MS blocks with s/n
MS45030019 forward, and any LS block. Any
previous serial numbers have the old format umbilical
harness.
New-style umbilical harness tests
1. Place the multi-meter on the continuity setting.
2. Measure between pin 2 and the graphite block.
This should return continuity. Ensure you pick a
spot that is not covered with Tefl on.
3. Measure between pin 2 (ground) and each pin
individually. No pins should return continuity.
4. Measure between pin 4 (EX+) and pin 6 (M+).
This should return continuity.
5. Measure between pin 1 (EX-) and pin 3 (M-).
This should return continuity.
6. Measure between pin 7 (L) and pin 9 (N). This
should return a resistance based on the following
table:
MODEL
VOLTAGE SELECTOR
SWITCH POSITION
RESISTANCE
DigiPREP Jr
115V
230V
18 ± 2
71 ± 2
DigiPREP MS
115V
230V
15 ± 2
57 ± 2
DigiPREP HP
115V
230V
15 ± 2
57 ± 2
DigiPREP LS
230V
20 ± 2
DigiPREP HT
230V 16 ± 2
7. Measure between pin 6 on the umbilical cord
(M+/EX+) and pin 1 of the dongle port. This
should return continuity.
8. Measure between pin 3 on the umbilical cord
(M-/EX-) and pin 3 of the dongle port.
This should return continuity.
Old-style umbilical harness tests
Instruments with the old-style umbilical harness
are for Junior blocks with s/n JR640404136 and
earlier, HP blocks with s/n 9241030021 and earlier,
and MS blocks with s/n MS45030019 and earlier.
Please note this style is discontinued and can no
longer be purchased. All LS blocks have the new
form of umbilical cord.
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