Graco TapeLazer HP Automatic Operation, Parts page 48

Troubleshooting
Diagnosing a Short Circuit
1. A short can be the result of two faulty
components: faulty solenoid manifold or
faulty control board.
2. Unplug all solenoid manifold wires
connected to control board outputs '1',
'2', and 'C', see Solenoid Locations on
Control Board, page 48.
3. Navigate to Diagnostics Screen #2 on
control display, see Information, page
38.
4. Actuate outputs '1', '2', and 'C', see the
Notes:, page 47, under Solenoid
Manifold Operation, page 46.
5. If the control board is still registering a
short, the board is bad and needs to be
replaced. If the control board is now
registering an open, the solenoid
manifold is bad and needs to be
replaced.
Diagnosing an Open Circuit
1. An open can be the result of two faulty
components: faulty solenoid manifold, or
faulty control board.
2. Unplug all solenoid manifold wires
connected to control board outputs '1',
'2', and 'C', see Solenoid Locations on
Control Board, page 48
3. Navigate to Diagnostic Screen #2 on
control display, see Information, page
38.
4. Actuate outputs '1', '2', and 'C', see the
Notes:, page 47, under Solenoid
Manifold Operation, page 46.
5. Measure the DC voltage across the
three solenoid outputs:
Without Solenoids Connected
Control Board Control Board
Output '1'
Reading
48
Control Board
Output '2' Output 'C'
Reading Reading
Without Solenoids Connected
13.5 +/- 1 VDC 13.5 +/- 1 VDC
6. If control board voltages are in this
range, the control board is good. The
solenoid manifold needs to be replaced.
7. In the Diagnostics Screen #3, check the
amperage of the three solenoid outputs
using he diagnostics screen, see
Information, page 38.
Minimum Amps with Solenoids Connected
Control Board Control Board
Output '1'
Reading
1850 mA
8. If any of the outputs are reading lower
than shown in the table, there is an open
in the solenoid manifold and it must be
replaced.
Solenoid Locations on Control Board
16-34 VDC
Control Board
Output '2' Output 'C'
Reading Reading
-- --
3A8108A