Troubleshooting Tables; Power Malfunction; Table 4.3 Power Malfunction Troubleshooting - CPG Compuprint SP 40 Maintenance Manual

Maintenance Manual

4.10 Troubleshooting Tables

NOTE: For the electrical value of the electromechanical parts, please refer to chapter 7.

4.10.1 Power malfunction

SYMPTOM
The printer is not powered
up
The printer is not powered
up.
The printer is powered on
but it is not working
properly.
The printer is powered off
after short time power on.
OUTPUT VOLTAGE:
5 VDC
+ 38 VDC
VREC from +78 to + 84 VDC @ 100 mA injected
The VREC circuit (clamping & recovery voltage) provided with an electronic circuit to clamp the collector voltage of the
needles drivers during their switching in OFF state (see chapter 7 for detail).
This circuit absorb the print head coils energy stored during the needle firing phase.
All the voltage are protected for Overvoltage, short-circuit and over-current.
The sketch of the Power supply is described at chapter 1.
The pin out of the Power Supply is :
P01-01 = ZGND
P01-02 = ZGND
P01-03 = +80VClamp
P01-04 = +80VClamp
P01-05 = +5V
P01-06 = +5V
P01-07 = ZGND
P01-08 = ZGND
P01-09 = +38V
P01-10 = +38V
P01-11 = +38V
P01-12 = N.C.
Rev. 005
PROBABLE CAUSE
No AC power is reaching the
printer
The switch lever don' t
correctly acting on the power
on switch of the power supply.
An incorrect voltage is present
on power supply.
An overload is present on
power supply.

Table 4.3 Power Malfunction Troubleshooting

Figure 4.2 Power Supply pin-out
CORRECTIVE ACTION
Check power cord insertion.
Check power at wall.
Replace power cord.
Check for the correct behaviour of the switch lever and
the springs on the base assy involved in the movement
of the lever. Replace the defective part.
Check for the voltages present on the power supply
P01 connector. Remove the P01 from the main board.
It is recommended to apply a minimum load to the
+5VDC and +38VDC to assure the power supply
stability.
Replace the Power Supply.
Replace the Engine Board.
Check for the correct cables connections.
Check for electromechanical parts impedance and
replace the faulty one.
Replace the Engine Board.
Replace Mechanical Assy
84
SP 40
Chapter 4
Service Maintenance