Remove/Replace Epc/Mpc Pressure Control Pcb - HP 5890 SERIES II Service Manual

Remove/Replace EPC/MPC Pressure Control PCB

HAZARDOUS VOLTAGES ARE PRESENT IN THE INSTRUMENT WHEN THE
`
POWER CORD IS CONNECTED. AVOID A POTENTIALLY DANGEROUS SHOCK
HAZARD BY DISCONNECTING THE POWER CORD BEFORE WORKING ON THE
INSTRUMENT.
FLAME IONIZATION (FID), NITROGEN PHOSPHOROUS (NPD), AND FLAME
`
PHOTOMETRIC (FPD) DETECTORS USE HYDROGEN GAS AS FUEL. BE SURE
ALL HYDROGEN GAS IS TURNED OFF AT ITS SOURCE BEFORE REPLACING
ANY FLOW COMPONENTS.
1. Set the main power line switch to the off position.
2. Disconnect the power cable from its receptacle.
3. Turn off all gas supplies.
4. Remove the electronics carrier top cover.
5. Remove the right side panel by
removing four screws: two each
along its top and bottom edges.
ELECTRONICS
CARRIER TOP
COVER
The following steps require protection against ESD (Electro- Static Discharge).
`
Use a grounded wrist strap (part no. 9300- 0969 - large, or 9300- 0970 - small)
connected to a suitable ground. Failure to heed this caution may result in
damage to the instrument.
When storing or in between handling of PCBs (Printed Circuit Boards), always
`
place them in static control envelopes or enclosures.
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com
SCREWS
SCREWS
RIGHT SIDE PANEL
SVC 3- 16
RED O VISIBLE
OFF ON