HP 437B - ANALOG BOARD CHECK; BATTERY REPLACEMENT PROCEDURE; ANALOG BOARD FUNCTIONAL VERIFICATION

Note
a
Analog Board Check
Note
U3
HP 437B
Service Sheet BD1
Battery Replacement Procedure
Battery replacement is necessary when the Power Meter repeatedly displays
"RECALL FAIL" when turned on.
1. Set the LINE switch to STBY.
2. Leave the line (Mains) power cord connected.
3. Remove A3BT1! from the Digital Board.
4. Replace A3BT1! with the recommended battery, HP part number
1420-0341.
This section contains procedures for troubleshooting the Analog board. Most
of the procedures will narrow the cause of a malfunction to a schematic.
Some of the procedures will isolate the problem to a circuit or component.
The following procedures must be performed in the sequence presented.
Analog Board Functional Verification
1. Connect the equipment as shown in Figure 8-1.
RANGE
POWE
R’
METER
CAL
|
BRATOR
POWER METER
Figure 8-1. Analog Board Troubleshooting Setup
SERVICE 8-29