KOMORI GS 228P PQC dont turn on(light)

Hi !
Our KOMORI GS 228 last night work very good, but in the morning the PQC ink fountain control
key dont work. Only the first key is light, the others dont light at all! This is on boat units first and second! Touch panel work properly ! Can you help me? Service manual for PQC or something else?Sorry for my English, I am from Macedonia!

Thank you!

 

Hi sir:
If the increase or decrease switch is not ON(Led fail to light up), faulty switch, or faulty contact connectors CN1+CN2+CN3+CN4 Can be the cause.

 

Hi Sir !
Thanks for your attention, I check the conectors, but the situation is the same. However , thank you for your ansver. If you have some other idea , let mi know.
Goodbye!

 

1a) If the increase or decrease switch is not ON(Led fail to light up), faulty switch

1) Perform a visual inspection : look for loose and broken wires, improperly seated connectors, loose or broken wires
misset switch, missing jumpers. and so on.
Chech for obviously damaged component(components burned or discolore due to overheating);
Dust + dirt + tear +wear

2) Reseating Boards and components:
Edge connectors are a common source of problems. Power down the system and remove the PC boards. Examine the edge connector
for contamination and clean with contacts cleaner contacts. Reseat any loose components such as scoketed ICs) . Reseat the
boards and power up.

3) Power supply checks:
Check the power supply for missing voltages and voltages out of spec. A digital multimieter DMM can be necessary, as
voltage specifications are quite tight: logic supplies for example: must be within + 0.5 percent of 5Vdc. All the
multiple supplies and all must be checked.