Service manual

Wells-Garnder Color Vector Monitor Guide
Page 70 of 73
HIGH VOLTAGE
The High Voltage PCB (in the metal cage with the flyback transformer) had several revisions
too. I would recommend doing the "upgrade" parts here as well. This brings your HV PCB to the
latest revision.
Zanen High Voltage (caged) PCB Parts
Location Part Number Upgrade? Notes
C901
220 uF 50v Low ESR radial
capacitor
Yes
Upgrade to 220 uF 50v; 100 uF is
included with Zanen kit
C902
220 uF 50v Low ESR radial
capacitor
Yes
Upgrade to 220 uF 50v; 100 uF is
included with Zanen kit
C905 33 uF 160v axial capacitor
C909 22 uF 50v radial capacitor
C910 10 uF 350v radial capacitor
C914 47 uF 50v radial capacitor
ZD902 Z150B zener diode 150v install at ZD902, not D902!
Q901 MPSA06 (NTE287) transistor
Q902 MPSA06 (NTE287) transistor
Q903 2N3904 transistor
R901 2.2 ohm 2 watt resistor Yes
Upgrade to 3.9 ohm @ 3 watt; 2.2
ohm is included in the Zanen kit
R907 2.2 ohm 2 watt resistor Yes
Upgrade to 3.9 ohm @ 3 watt; 2.2
ohm is included in the Zanen kit
R918 25k Pot
Do not install unless necessary: pre-
adjust to 5.5k ohms on the upper 2
contacts
NON-Zanen High Voltage (caged) PCB Parts
Location Part Number Upgrade? Notes
R903 3.9 ohm ½ watt resistor No, but… replace anyway
R910 6.8k ohm ¼ watt resistor Yes replaces 12k ohm original
R911 4.7k ohm ¼ watt resistor Yes replaces 6.8k ohm original
R926 2.2 ohm 3 watt resistor Yes replaces 2 watt original