QRO Technologies HF-2500DX Instruction Manual page 17

Multimeter inoperative in Plate Current
Function
Multimeter inoperative in Screen Voltage
Function
Plate idle current over 800 mA
Plate Current does not read zero in standby
mode
No Plate idle current
Meter Lamps do not light
Amplifier will not key when transceiver is keyed
to transmit
1. Resistors R311 LV & Bias PCB
2. Switch SW401A&B Meter Switch PCB
3. M-1 Multimeter
4. F303 2 Ampere Fuse
1. Components on Screen Supply PCB
a. Capacitors C401 or C402
b. Diodes D401, D402
c. Resistors R405, R406, R407, R408
d. Zener Diodes ZD401 - ZD404
e. Fuse F401 2 Ampere Fuse
2. Switch SW401A&B Meter Switch PCB-510
3. M-1 Multimeter
4. Transformer T-1 Secondary
1. Components on LV & Bias PCB
a. Zener Diodes ZD301
b. Relay K4
1. Components on LV & Bias PCB
a. D307 Bridge Rectifier
b. C311 Electrolytic Capacitor
c. Relay K4
d. Fuse F301 2 ampere
1. Components on LV & Bias PCB
a. Fuse 303 2 Ampere
b. Shunt Resistor R311
2. Screen Supply PCB component failure
1. Components on LV & Bias PCB
a. Fuse F302
b. Bridge Rectifier D306
c. Capacitors C307, C308, C309
d. +12v Regulator U2
2. Associated +12v Supply wiring
3. Meter Lamps PL1 - PL4 Meter Switch
1. Components on LV & Bias PCB
a. Fuse F301
b. Bridge Rectifier D302
c. Capacitor C301
2. Components on RF I/O Switching PCB-350
3. Operate Standby SW4 Front Panel
17