Circuit Card Of Buzzer And Ind. Lights; Fault Tracing; Buzzer Test; Circuit Card Illumination - Valtra 6000 Workshop Manual

31. Autocontrol II

Circuit card of buzzer and ind. lights

A. Buzzer test:
--- Ground connector pin 5 and feed voltage of 12 V to pin 7.
--- Ground pin 9 and feed voltage of 12 V to pin 8 at which
time the buzzer should alarm continuously.
--- Disconnect pin 8 after which the buzzer should alarm
about 2 minutes.
B. Circuit card illumination:
--- Feed voltage of 12 V to pin 6 at which time the lamp E1
should come on (pin 5 grounded).
C. Signal lights of Delta Power Shift:
With different ratios the control unit A10 feeds current to
the circuit card A9 connector pins 1, 2 and 3. This current
lights up leds H1, H2 and H3.
The led voltages (12 V) can be measured from pins 1, 2
and 3 of connector A9 with different gear ratios. Lacking
voltage indicates that there are breaks in wires or the con-
trol unit A10 is faulty.

Fault tracing

A. Fuses and supply voltages of Delta Powershift:
If there are malfunctions, take the following steps:
--- Check the control unit fuse F22 in the fusebox.
--- Check the buzzer fuse F11 in the fuse box.
If the fuses are in condition:
--- Measure from the control unit A10 connector pin 1, that the
unit gets the supply (12 V). Measure from the circuit card
A9 connector pin 7, that the card gets the supply (12 V).
Lacking supply voltage indicates that there are breaks in
supply wires.
B. Solenoid valves:
Test whether the valves Y4 and Y6 get supply voltage (12 V).
Engage different Powershift ratios and check whether the
valve in question becomes energised. When the valve is ener-
gised, the nut at the end of the valve is magnetic. Voltage can
also be measured from the valve connector. If there is no volt-
age, fault can lie in the control unit A10 or in wire contacts.
C. Control unit A10
The control unit has 5 input signals and 5 output signals (see
picture 3). Output signals can be tested by checking the sole-
noid valves as described above or by measuring voltages to
the signal light circuit card as shown paragraph C above.
The control unit cannot be repaired but it should be changed
as a complete unit.
1. 1. 1994
Picture 4. Circuit card A9 of buzzer and ind. lights.The card
is supplied with permanent voltage via fuse F11.
D. Push buttons:
--- By pushing the foremost button, the 12 V signal is sent to
the control unit connector pin 6 and ratio is changed one
step down.
--- By pushing the rearmost button, the 12 V signal is sent to
the control unit connector pin 4 and ratio is changed one
step up.
Note! Continuous pushing changes only one step up or
down. In highest or lowest ratio, the ration does not change
any more although the button of the direction in question is
pushed.
E. Clutch pedal switch S24:
--- When the pedal is in the upper position, voltage of 12 V is
sent to the control unit connector pin 5.
--- With depressed pedal, the voltage is zero and both sole-
noid valves are unenergised and power is not transmitted
by the gear.
--- The switch reduces the rotating masses to minimum in
order to make gear change with gear levers easier.
IMPORTANT! If ind. light number 1 goes out and light 3
lights continuously, this indicates that there is line breaks
in wires between the control unit A10 and the solenoid
valves.
244
Model Code
6000-- 8750 311
Page
6